CN109999979B - Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker - Google Patents
Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker Download PDFInfo
- Publication number
- CN109999979B CN109999979B CN201910360795.XA CN201910360795A CN109999979B CN 109999979 B CN109999979 B CN 109999979B CN 201910360795 A CN201910360795 A CN 201910360795A CN 109999979 B CN109999979 B CN 109999979B
- Authority
- CN
- China
- Prior art keywords
- powder
- calcium oxide
- clinker
- expansion
- grinding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 178
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 177
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 title claims abstract description 176
- 238000000227 grinding Methods 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 235
- 239000002245 particle Substances 0.000 claims abstract description 103
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 73
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 238000009826 distribution Methods 0.000 claims abstract description 33
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 22
- 229910052925 anhydrite Inorganic materials 0.000 claims abstract description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims description 29
- 239000000428 dust Substances 0.000 claims description 26
- 239000011362 coarse particle Substances 0.000 claims description 23
- 239000010419 fine particle Substances 0.000 claims description 17
- 238000012216 screening Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 abstract description 15
- 238000013329 compounding Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 235000012255 calcium oxide Nutrition 0.000 description 152
- 239000004567 concrete Substances 0.000 description 35
- 239000000047 product Substances 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 18
- 230000001276 controlling effect Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000011411 calcium sulfoaluminate cement Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a grinding device and a grinding process for improving expansion efficiency of calcium oxide expansion clinker. The invention treats the calcium oxide expansion clinker by a combined grinding process consisting of the roller press pre-grinding, the primary frequency conversion powder selecting machine selecting powder, the vertical mill deep grinding and the secondary frequency conversion powder selecting machine selecting powder, improves the particle size distribution of the calcium oxide expansion clinker powder, avoids the over-grinding phenomenon of the calcium oxide expansion clinker in the grinding process, and obviously improves the expansion efficiency of the calcium oxide expansion clinker powder. The invention has simple process flow, fully exerts the advantages of the calcium oxide expansion clinker powder and the gypsum powder by optimizing the grinding process and the mixing and compounding process on the basis of the basic performances of the existing calcium oxide expansion clinker and the anhydrite, remarkably improves the expansion limiting rate of the expansion agent product, achieves the purpose of low doping and high efficiency, effectively reduces the production cost of the expansion agent product, provides market competitiveness for popularization and application of the expansion agent, and has remarkable social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of building material concrete additives, and particularly relates to a grinding process for improving expansion efficiency of calcium oxide expansion clinker and a concrete expansion agent produced based on the grinding process.
Background
The crack control problem of concrete is one of the most important problems in the construction engineering, and the shrinkage compensation concrete prepared by blending the expanding agent is one of the main technical means for solving the shrinkage cracking problem of the concrete. The existing commonly used expanding agents mainly comprise a sulphoaluminate expanding agent, a calcium oxide expanding agent and a magnesium oxide expanding agent, and the calcium oxide expanding agent has an increasingly important position in engineering practice due to the excellent performances of high expansion efficiency, low wet curing requirement and the like. To date, there are many patent documents on calcium oxide swelling agents and methods for preparing the same, such as:
chinese patent publication No. CN102162244a discloses a method for preparing a concrete expansion agent. The concrete expansion agent is prepared by grinding 40-80 wt% of limestone and 20-60 wt% of gypsum together, calcining at 1300-1500 ℃ in a rotary kiln, and grinding the calcined substance and 20-80 wt% of calcium sulfoaluminate cement clinker or alunite (calcined or non-calcined) or calcium aluminate cement clinker or a mixture thereof together according to the proportion of 20-80 wt% to the specific surface area of 150-400m 2/kg. The concrete expanding agent only gives specific surface area control index for controlling the fineness of the product, and has no specific expanding agent particle size distribution requirement.
Chinese patent publication No. CN103130437a discloses a method for preparing a concrete expansion agent. The method comprises the steps of grinding 40-80 wt% of limestone, 20-60 wt% of gypsum and 0.1-1.0 wt% of alumina and/or aluminum sulfate in total of the limestone and the gypsum together, calcining at a high temperature of 1300-1500 ℃ in a rotary kiln to obtain expanded clinker, and grinding the expanded clinker and calcium sulfoaluminate cement clinker, calcium stearate or/and triethanolamine together to a specific surface area of 140-400m 2/kg to obtain the concrete expanding agent. The concrete expanding agent also only gives specific surface area control index for controlling the fineness of the product, and has no specific expanding agent particle size distribution requirement.
Chinese patent publication No. CN101774777a discloses a method for preparing a concrete expansion agent. The method comprises grinding limestone and compound mineralizer into raw material, calcining at 1100-1300deg.C to obtain calcium oxide expansion clinker, mixing with dispersible carrier, and grinding to specific surface area of 150-450m 2/kg to obtain the final product. The concrete expanding agent also only gives specific surface area control index for controlling the fineness of the product, and has no specific expanding agent particle size distribution requirement.
Chinese patent publication No. CN103496867a discloses a method for preparing a concrete expansion agent. The raw material is prepared from 40-90 wt% of limestone, 5-50 wt% of anhydrite and 2-20 wt% of bauxite, and calcium oxide (quicklime) is used for replacing not less than 20wt% (20-100 wt%) of limestone to prepare raw material, the raw material is calcined in a rotary kiln at a high temperature of 1250-1450 ℃, and the calcined material is ground to a specific surface area of 150-400m 2/kg to prepare the concrete expanding agent. The concrete expanding agent also only gives specific surface area control index for controlling the fineness of the product, and has no specific expanding agent particle size distribution requirement.
Chinese patent publication No. CN102838308a discloses a method for preparing a concrete expansion agent. The method comprises the steps of mixing and grinding 88-95 wt% of anhydrite, 4-8 wt% of coke and 1-4 wt% of iron powder to prepare raw materials, calcining the raw materials in a rotary kiln at 1350-1450 ℃ to prepare expanded clinker, and directly grinding the expanded clinker to a specific surface area of 250-350m 2/kg or mixing and grinding the obtained expanded clinker with anhydrite and blast furnace slag to a specific surface area of 250-350m 2/kg to prepare the concrete expanding agent. The concrete expanding agent also only gives specific surface area control index for controlling the fineness of the product, and has no specific expanding agent particle size distribution requirement.
Chinese patent publication No. CN102674738a discloses a method for preparing a multifunctional anti-cracking additive. The concrete crack resistant additive with specific surface area of 200-400m 2/kg is ground by adopting 25-40% of calcium oxide expansion clinker, 1-3% of dextrin and fly ash mixed powder. The concrete anti-cracking additive only gives specific surface area control indexes for controlling the fineness of the product, and has no specific product particle size distribution requirement.
The expanding agent is prepared by taking calcium oxide expanded clinker as a main expanding component, taking gypsum, fly ash or other mixed materials as auxiliary expanding components and adopting a co-grinding mode, but the fineness of the expanding agent only gives specific surface area control indexes, the particle size distribution requirement of the expanding agent is not clear, and the difference of grindability of different materials is not considered when the calcium oxide expanded clinker and the gypsum, the fly ash or other mixed materials are co-ground, so that the different materials are difficult to exert the self optimal performance. Although the patent does not clearly show what grinding equipment is adopted to grind the expanding agent to the specific surface area required by the product, the applicant finds that in practical research, due to the relation of the market capacity of the expanding agent product, small rotary kilns are mostly adopted by several large-scale expanding agent manufacturers in China to calcine the calcium oxide expansion clinker, and a ball mill is adopted to grind the calcium oxide expansion clinker in cooperation with the small rotary kilns. When the calcium oxide expansion clinker reaches the specific surface area, the grinding process is easy to cause the over grinding phenomenon, the content of fine powder particles below 0.03mm is more than 30-40%, the content of medium particles between 0.03mm and 0.10mm is about 40-60%, and the content of large particles between 0.10mm and 0.15mm is about 10-20%. Meanwhile, the applicant finds that the particle size distribution of the calcium oxide expansion clinker powder has close correlation with the expansion performance of the calcium oxide expansion clinker powder, the hydration reaction rate of the calcium oxide expansion clinker powder with the particle size of 0-0.03mm is higher, the early expansion is mostly consumed in the plastic stage of cement concrete, and the calcium oxide expansion clinker powder becomes ineffective expansion, and the effective expansion generated in the concrete hardening stage is smaller; the calcium oxide expansion clinker powder with the particle size of 0.03-0.10mm has the hydration reaction rate matched with that of cement hydration, and can generate larger effective expansion in the hardening stage of concrete; the calcium oxide expansion clinker powder with the particle size of 0.10-0.15mm has relatively slow hydration reaction rate, and can generate larger expansion deformation in the hardening stage of concrete, but when the particle size of the calcium oxide expansion clinker powder is too large, hydration products are easy to agglomerate in the concrete to form local expansion, thereby causing structural damage and causing poor stability. It can be seen that if the effective expansion efficiency of the calcium oxide expansion clinker powder in the hardening stage of concrete is to be improved, the calcium oxide expansion clinker powder should be formed into a particle size distribution of 'large middle and small two ends'. In addition, the applicant finds that the finer the particles, the better the hydration performance of gypsum is as the most commonly used expansion auxiliary component, and the better the expansion efficiency is exerted. The existing co-grinding production mode is difficult to regulate the grain composition of the calcium oxide expansion clinker and the gypsum, so that the co-grinding mode is not suitable for producing the expanding agent product by combining the calcium oxide expansion clinker and the gypsum.
The existing Chinese journal literature data (Wang Dongmin, the influence of particle size distribution on the expansion agent performance, the influence of the particle size distribution of an expansion agent for concrete on the expansion performance, fang Ruiliang, the influence research of the particle composition of the expansion agent on the limiting expansion rate, wu Cuie, the comparative research of the particle size analysis method and the test result of the expansion agent finished product, li Naizhen, the expansion agent particle size grading research and the like) also consider that the expansion agent particle size has a close relation on the expansion performance, but the existing journal literature data only show the relation between the particle size of the expansion agent screened under the laboratory condition and the expansion performance, and no specific preparation process exists, so that the reasonable industrial production application cannot be carried out. The quality of the expanding agent is always the most concerned problem of researchers and production enterprises, and how to improve the effective expansion efficiency of the expanding agent and achieve the aim of low doping and high efficiency is a target of thinking and pursuing.
Disclosure of Invention
Aiming at the defects of the prior art that the grinding fineness of the calcium oxide expansion agent is larger than the small particle content, the early hydration is faster, the ineffective expansion consumed in the plastic stage of the cement concrete is larger than the effective expansion in the hardening stage of the cement concrete, the invention provides a grinding process for improving the expansion efficiency of the calcium oxide expansion clinker and the expansion agent prepared by the grinding process.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a grinding device for improving the expansion efficiency of calcium oxide expansion clinker, which comprises a raw calcium oxide expansion clinker bin, a roller press, a primary frequency conversion powder concentrator, a vertical mill, a secondary frequency conversion powder concentrator, a dust collector and a finished calcium oxide expansion clinker bin;
The lower part of the roller press is provided with screening equipment, a coarse particle discharge port and a fine particle discharge port, wherein the coarse particle discharge port is positioned above the screening equipment, and the fine particle discharge port is positioned below the screening equipment;
The primary frequency conversion powder concentrator is provided with a primary frequency conversion powder concentrator feed inlet, a primary frequency conversion powder concentrator fine powder discharge outlet and a primary frequency conversion powder concentrator coarse powder discharge outlet;
the vertical mill is provided with a vertical mill feed inlet and a vertical mill discharge outlet;
The secondary variable frequency powder selector is provided with a secondary variable frequency powder selector feed inlet, a secondary variable frequency powder selector fine powder discharge port and a secondary variable frequency powder selector coarse powder discharge port;
Wherein a discharging opening of the calcium oxide expansion clinker raw material bin arranged below the calcium oxide expansion clinker raw material bin is connected with a feeding opening of a roller press arranged above the roller press through conveying equipment; the coarse particle discharge port of the roller press is connected with the feeding port of the roller press through conveying equipment, and the fine particle discharge port of the roller press is connected with the feeding port of the primary frequency conversion powder concentrator through conveying equipment; the fine powder discharge port of the primary frequency conversion powder concentrator is connected with the dust collector through conveying equipment, and the coarse powder discharge port of the primary frequency conversion powder concentrator is connected with the feed port of the vertical mill through conveying equipment; the fine powder discharge port of the secondary variable frequency powder concentrator is connected with the dust collector through the conveying equipment, and the coarse powder discharge port of the secondary variable frequency powder concentrator is connected with the feed port of the vertical mill through the conveying equipment; and a dust collector discharge port arranged below the dust collector is connected with a calcium oxide expansion clinker finished product bin through conveying equipment.
The grinding process for improving the expansion efficiency of the calcium oxide expansion clinker by using the grinding device provided by the invention comprises the following steps of:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.4m/s-1.6m/s, coarse particles with the particle size more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion until all calcium oxide expansion clinker particles are ground into fine particles with the particle size less than 3 mm;
(2) Adopting a primary frequency conversion powder concentrator to carry out powder concentration treatment on the fine particles with the particle size smaller than 3mm screened in the step (1), wherein the fine powder with the particle size smaller than or equal to 0.10mm is directly sent into a calcium oxide expansion clinker powder storage bin for storage after being collected by a dust collector, and coarse powder with the particle size larger than 0.10mm is sent into a vertical mill;
(3) Feeding the coarse powder of the calcium oxide expansion clinker separated in the step (2) and with the particle size of more than 0.10mm and less than 3mm into a vertical mill for deep grinding to obtain the deeply ground calcium oxide expansion clinker powder, wherein the grinding disc pressure of the vertical mill is controlled to be 750KN-850KN, and the grinding disc rotating speed is controlled to be 18r/min-22r/min;
(4) And (3) carrying out powder selecting and regulating treatment on the calcium oxide expansion clinker powder subjected to deep grinding in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the particle size of more than 0.10mm to a vertical mill for continuous grinding, collecting fine powder with the particle size of less than or equal to 0.10mm by a dust collector, and directly sending the fine powder into a calcium oxide expansion clinker powder storage bin for storage.
In the scheme, through the powder selecting regulation and control treatment of the primary frequency conversion powder selecting machine and the secondary frequency conversion powder selecting machine, the calcium oxide expansion clinker fine powder with the grain diameter smaller than or equal to 0.10mm generated in the pre-grinding process and the calcium oxide expansion clinker fine powder with the grain diameter smaller than or equal to 0.10mm generated in the deep grinding process are taken as a part of the calcium oxide expansion clinker powder prepared by final grinding to enter a storage bin for storage, so that the generation of over-grinding phenomenon is avoided, and the content of fine powder in the calcium oxide expansion clinker powder is remarkably reduced; coarse calcium oxide expansion clinker particles with the particle size larger than 3mm generated in the pre-grinding process are returned to a roller press to be squeezed again for pre-grinding, coarse calcium oxide expansion clinker particles with the particle size larger than 0.10mm generated in the deep grinding process are returned to a vertical mill to be subjected to deep grinding again, the content of the coarse particles in the calcium oxide expansion clinker powder is effectively reduced, and the problem that the stability of the calcium oxide expansion clinker powder is poor due to the fact that the coarse particle content is high is avoided. The particle size distribution of the calcium oxide expansion clinker powder prepared by the grinding process is in a state of large middle and small two ends, wherein when the particle size distribution of each interval is calculated according to the mass percent of screen residue, the particle size is controlled to be 0-0.03mm 10-20%, 0.03-0.10mm 70-80%, 0.10-0.15mm 5-10% and more than 0.15mm 0-5%.
The invention also provides an expanding agent prepared by taking the calcium oxide expansion clinker powder obtained by the grinding process as a main expansion component, which is prepared by mixing and compounding the calcium oxide expansion clinker powder and the gypsum powder prepared by the grinding process according to the mass ratio of 20-60:40-80.
In the expanding agent, the gypsum powder is ground from anhydrite in a ball mill until the grain fineness is within 10 percent of the screen residue of a sieve with 0.045 mm.
Compared with the existing product, the invention effectively avoids the over-grinding phenomenon of the calcium oxide expansion clinker in the grinding process, improves the particle size distribution of the calcium oxide expansion clinker powder, ensures that the particle size distribution of the calcium oxide expansion clinker powder forms a state with large middle and small two ends, reduces the ineffective expansion of the calcium oxide expansion clinker powder in the concrete plastic stage on the premise of ensuring the stability of the calcium oxide expansion clinker powder, and improves the effective expansion of the calcium oxide expansion clinker powder in the concrete hardening stage. The expansion agent product is prepared by respectively grinding and mixing the calcium oxide expansion clinker and the anhydrite, so that the grain composition of the expansion agent product is optimized, the advantages of the calcium oxide expansion clinker powder and the gypsum powder are brought into play, the expansion rate of the expansion agent product is obviously improved, and the purposes of low doping and high efficiency are achieved. The invention has simple process flow, can improve the expansion efficiency of the calcium oxide expansion clinker powder by optimizing the grinding process and the mixing and compounding process on the basis of the basic performances of the existing calcium oxide expansion clinker and anhydrite, can optimize the expansion performance of the gypsum powder, obviously improves the expansion performance of the expansion agent product prepared by compounding the calcium oxide expansion clinker and the gypsum, effectively reduces the production cost of the expansion agent product, provides market competitiveness for popularization and application of the expansion agent, and has obvious social and economic benefits.
Drawings
Fig. 1 is a diagram of a grinding device for improving the expansion efficiency of the calcium oxide expansion clinker.
Fig. 2 is a flow chart of a grinding process for improving the expansion efficiency of the calcium oxide expansion clinker and a process for preparing an expansion agent according to the invention.
In fig. 1: 1. a raw material bin of calcium oxide expansion clinker; 11. a blanking opening of a raw material bin of the calcium oxide expansion clinker; 2. a roller press; 21. a feeding port of the roller press; 22. a screening device; 23. coarse particle discharge port; 24. fine particle discharge port; 3. a primary frequency conversion powder concentrator; 31. a feed inlet of the primary frequency conversion powder concentrator; 32. fine powder discharging hole of primary frequency conversion powder selecting machine; 33. coarse powder discharge port of primary frequency conversion powder concentrator; 4. a vertical mill; 41. a vertical mill feed inlet; 42. a discharge hole of the vertical mill; 5. a second-stage variable-frequency powder selector; 51. a feed inlet of the secondary variable-frequency powder concentrator; 52. a fine powder discharging hole of the secondary variable frequency powder concentrator; 53. coarse powder discharge port of the second-stage variable-frequency powder concentrator; 6. a dust collector; 61. a dust collector discharge port; 7. and (5) a calcium oxide expansion clinker finished product bin.
Detailed Description
For a better understanding of the present invention, the following description will further illustrate the present invention with reference to specific examples, but the present invention is not limited to the following examples. The raw materials of the calcium oxide expanded clinker particles and the anhydrite used in the invention are commercially available, the calcium oxide expanded clinker particles used in the embodiment of the invention are from Jiangsu Su Bote new material stock Co., ltd, and the anhydrite used in the embodiment of the invention is from Anhui mountain-containing anhydrite mining area.
Example 1
A grinding process for improving the expansion efficiency of calcium oxide expansion clinker comprises the following steps:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.4m/s, coarse particles with the particle size of more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion;
(2) Adopting a primary frequency conversion powder concentrator to carry out powder concentration treatment on the fine particles with the particle size smaller than 3mm screened in the step (1), wherein the fine powder with the particle size smaller than or equal to 0.10mm is directly sent into a calcium oxide expansion clinker powder storage bin for storage after being collected by a dust collector, and coarse powder with the particle size larger than 0.10mm is sent into a vertical mill;
(3) Feeding coarse powder (calcium oxide expansion clinker with the particle size of more than 0.10mm and less than 3 mm) separated in the step (2) into a vertical mill for deep grinding, wherein the pressure of a millstone of the vertical mill is controlled at 800KN, and the rotating speed of the millstone is controlled at 20r/min;
(4) And (3) carrying out powder selecting and regulating treatment on the calcium oxide expansion clinker powder deeply ground in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the grain diameter of more than 0.10mm to a vertical mill for continuous grinding, collecting fine powder with the grain diameter of less than or equal to 0.10mm by a dust collector, and directly sending the fine powder into a calcium oxide expansion clinker powder storage bin for storage.
The specific surface area of the calcium oxide expansion clinker powder is 280m 2/kg, and when the particle size distribution of each interval is calculated according to the mass percent of screen residue, the particle size distribution of the calcium oxide expansion clinker powder is as follows: 20% of 0-0.03mm, 70% of 0.03-0.10mm, 8% of 0.10-0.15mm and 2% of more than 0.15 mm.
The calcium oxide expansion clinker powder prepared by the grinding process is used for preparing an expanding agent product, the expanding agent product is prepared by mixing and compounding the calcium oxide expansion clinker powder and gypsum powder in a mass ratio of 20-60:40-80, wherein the gypsum powder is ground by anhydrite in a ball mill until the grain fineness is 0.045mm and the screen residue is 8%.
Example 2
A grinding process for improving the expansion efficiency of calcium oxide expansion clinker comprises the following steps:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.5m/s, coarse particles with the particle size of more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion;
(2) Adopting a primary frequency conversion powder concentrator to carry out powder concentration treatment on the fine particles with the particle size smaller than 3mm screened in the step (1), wherein the fine powder with the particle size smaller than or equal to 0.10mm is directly sent into a calcium oxide expansion clinker powder storage bin for storage after being collected by a dust collector, and coarse powder with the particle size larger than 0.10mm is sent into a vertical mill;
(3) Feeding coarse powder (calcium oxide expansion clinker with the particle size of more than 0.10mm and less than 3 mm) separated in the step (2) into a vertical mill for deep grinding, wherein the pressure of a millstone of the vertical mill is controlled to be 750KN, and the rotating speed of the millstone is controlled to be 18r/min;
(4) And (3) carrying out powder selecting and regulating treatment on the calcium oxide expansion clinker powder deeply ground in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the grain diameter of more than 0.10mm to a vertical mill for continuous grinding, collecting fine powder with the grain diameter of less than or equal to 0.10mm by a dust collector, and directly sending the fine powder into a calcium oxide expansion clinker powder storage bin for storage.
The specific surface area of the calcium oxide expansion clinker powder is 260m 2/kg, and when the particle size distribution of each interval is calculated according to the mass percent of screen residue, the particle size distribution of the calcium oxide expansion clinker powder is as follows: 10% of 0-0.03mm, 80% of 0.03-0.10mm, 9% of 0.10-0.15mm and 1% of more than 0.15 mm.
The calcium oxide expansion clinker powder prepared by the grinding process is used for preparing an expanding agent product, the expanding agent product is prepared by mixing and compounding the calcium oxide expansion clinker powder and gypsum powder in a mass ratio of 20-60:40-80, wherein the gypsum powder is ground by anhydrite in a ball mill until the grain fineness is 0.045mm and the screen residue is 5%.
Example 3
A grinding process for improving the expansion efficiency of calcium oxide expansion clinker comprises the following steps:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.6m/s, coarse particles with the particle size of more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion;
(2) Adopting a primary frequency conversion powder concentrator to carry out powder concentration treatment on the fine particles with the particle size smaller than 3mm screened in the step (1), wherein the fine powder with the particle size smaller than or equal to 0.10mm is directly sent into a calcium oxide expansion clinker powder storage bin for storage after being collected by a dust collector, and coarse powder with the particle size larger than 0.10mm is sent into a vertical mill;
(3) Feeding coarse powder (calcium oxide expansion clinker with the particle size of more than 0.10mm and less than 3 mm) separated in the step (2) into a vertical mill for deep grinding, wherein the pressure of a millstone of the vertical mill is controlled at 850KN, and the rotating speed of the millstone is controlled at 22r/min;
(4) And (3) carrying out powder selecting and regulating treatment on the calcium oxide expansion clinker powder deeply ground in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the grain diameter of more than 0.10mm to a vertical mill for continuous grinding, collecting fine powder with the grain diameter of less than or equal to 0.10mm by a dust collector, and directly sending the fine powder into a calcium oxide expansion clinker powder storage bin for storage.
The specific surface area of the calcium oxide expansion clinker powder is 270m 2/kg, and when the particle size distribution of each interval is calculated according to the mass percent of screen residue, the particle size distribution of the calcium oxide expansion clinker powder is as follows: 15% of 0-0.03mm, 78% of 0.03-0.10mm, 5% of 0.10-0.15mm and 2% of more than 0.15 mm.
The calcium oxide expansion clinker powder prepared by the grinding process is used for preparing an expanding agent product, the expanding agent product is prepared by mixing and compounding the calcium oxide expansion clinker powder and gypsum powder in a mass ratio of 20-60:40-80, wherein the gypsum powder is ground by anhydrite in a ball mill until the grain fineness is 0.045mm and the screen residue is 10%.
Comparative example 1
The same as the calcium oxide expansion clinker used in examples 1 to 3 is distinguished only by the grinding process, and the specific steps are as follows:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.6m/s, coarse particles with the particle size of more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion;
(2) Feeding the fine particles with the particle size smaller than 3mm screened in the step (1) into a vertical mill for deep grinding, wherein the millstone pressure of the vertical mill is controlled to 850KN, and the millstone rotating speed is controlled to 22r/min;
(3) And (3) carrying out powder selecting regulation and control treatment on the calcium oxide expansion clinker powder deeply ground in the step (2) by adopting a variable frequency powder selecting machine, returning coarse powder with the grain diameter of more than 0.10mm to a vertical mill for continuously grinding, collecting fine powder with the grain diameter of less than or equal to 0.10mm by a dust collector, and directly sending the fine powder into a calcium oxide expansion clinker powder storage bin for storage.
The specific surface area of the calcium oxide expansion clinker powder is 260m 2/kg, and when the particle size distribution of each interval is calculated according to the mass percent of screen residue, the particle size distribution of the calcium oxide expansion clinker powder is as follows: 25% of 0-0.03mm, 60% of 0.03-0.10mm, 10% of 0.10-0.15mm and 5% of more than 0.15 mm.
Comparative example 2
The same as the calcium oxide expansion clinker used in examples 1 to 3 is distinguished only by the grinding process, and the specific steps are as follows:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.6m/s, coarse particles with the particle size of more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion;
(2) Adopting a variable frequency powder concentrator to carry out powder concentration treatment on the fine particles with the particle size smaller than 3mm screened in the step (1), wherein the fine powder with the particle size smaller than or equal to 0.10mm is directly sent into a calcium oxide expansion clinker powder storage bin for storage after being collected by a dust collector, and coarse powder with the particle size larger than 0.10mm is sent into a vertical mill;
(3) Feeding coarse powder (calcium oxide expansion clinker with the particle size larger than 0.10mm and smaller than 3 mm) separated in the step (2) into a vertical mill for deep grinding, controlling the millstone pressure of the vertical mill to be 850KN and the millstone rotating speed to be 22r/min, and preparing the calcium oxide expansion clinker powder with the specific surface area of 260m 2/kg, wherein the particle size distribution of each interval is calculated according to the mass percent of screen residue, and the measured particle size distribution of the calcium oxide expansion clinker powder is as follows: 32% of 0-0.03mm, 50% of 0.03-0.10mm, 12% of 0.10-0.15mm and 6% of more than 0.15 mm.
Comparative example 3
The same as the calcium oxide expanded clinker used in examples 1 to 3 is distinguished only by the grinding process. According to the traditional grinding process of the calcium oxide expansion clinker, grinding the calcium oxide expansion clinker to the specific surface area of 250m 2/kg by adopting a ball mill to prepare the calcium oxide expansion clinker powder of the comparative example, testing the particle size distribution of the calcium oxide expansion clinker powder, wherein each particle size interval comprises the following components in percentage by mass: 35% 0-0.03mm, 45% 0.03-0.10mm, 15% 0.10-0.15mm, 5% greater than 0.15 mm.
Comparative example 4
The same as the calcium oxide expanded clinker and anhydrite used in examples 1 to 3 were mixed and ground in a ball mill at a mass ratio of 50:50 to prepare a comparative example expander product having a specific surface area of 300m 2/kg.
Physical properties of examples and comparative examples are tested by referring to the method prescribed in the current national standard GB23439-2017 'concrete expanding agent', and the particle size distribution and expansion property detection results of the calcium oxide expanded clinker powder prepared by the three grinding processes of examples 1-3 and comparative examples 1-3 are given in Table 1. Table 2 shows the limiting expansion rates of the expander products obtained by the two preparation processes of examples 1 to 3 and comparative example 4.
TABLE 1 Performance test of the expansion clinker powders prepared in examples 1 to 3 and comparative examples 1 to 3
TABLE 2 limiting expansion Rate of the expansion agent products prepared in examples 1-3 and comparative example 4
As can be seen from the data in table 1, the optimized grinding process of the present invention adopted in examples 1 to 3 effectively improves the particle size distribution of the calcium oxide expanded clinker powder, avoids the over-grinding phenomenon, and significantly improves the limiting expansion rate of the calcium oxide expanded clinker powder, as compared with the grinding process adopted in comparative examples 1 to 3.
Compared with comparative example 1, the embodiment of the invention carries out powder selecting, separating and regulating treatment on fine particles with the particle diameter smaller than 3mm prepared by pre-grinding of a roller press by a primary frequency conversion powder selecting machine before carrying out deep grinding of a vertical mill, firstly, collecting and sending calcium oxide expansion clinker fine powder with the particle diameter smaller than or equal to 0.10mm into a calcium oxide expansion clinker powder storage bin for storage by a dust collector, and then feeding calcium oxide expansion clinker coarse powder with the particle diameter larger than 0.10mm and smaller than 3mm into the vertical mill for deep grinding, thereby avoiding excessive grinding of the calcium oxide expansion clinker fine powder with the particle diameter smaller than or equal to 0.10mm in the pre-grinding process in the vertical mill, reducing the particle content of 0-0.03mm from 25% to 10% -20%, increasing the particle content of 0.03-0.10mm from 60% to 70% -80%, and increasing the 7d limiting expansion rate of the calcium oxide expansion clinker powder from 0.18% to 0.23%.
Compared with comparative example 2, the embodiment of the invention separates and selects the calcium oxide expansion clinker fine powder with the grain diameter less than or equal to 0.10mm generated in the deep grinding process in the vertical mill in time through the two-stage frequency conversion powder concentrator, and sends the calcium oxide expansion clinker fine powder into the calcium oxide expansion clinker powder storage bin for storage through the dust collector for storage, so that the grain diameter of the ground calcium oxide expansion clinker in the vertical mill is controlled between 0.10mm and 3mm, the repeated excessive grinding of the calcium oxide expansion clinker fine powder with the grain diameter less than or equal to 0.10mm in the vertical mill is effectively reduced, the grain content of 0-0.03mm is reduced from 32% to 10% -20%, the grain content of 0.03-0.10mm is increased from 50% to 70% -80%, and the 7d limiting expansion rate of the calcium oxide expansion clinker powder is increased from 0.16% to 0.23%.
Compared with comparative example 3, the embodiment of the invention optimizes the particle size distribution of the calcium oxide expansion clinker powder under the same specific surface area by the pre-grinding of the roller press and the deep grinding of the vertical mill and the powder selecting regulation treatment of the first-stage variable frequency powder selecting machine and the second-stage variable frequency powder selecting machine, reduces the particle content of 0-0.03mm from 35% to 10-20%, increases the particle content of 0.03-0.10mm from 45% to 70-80%, and increases the 7d limit expansion rate of the calcium oxide expansion clinker powder from 0.15% to 0.23%.
Therefore, the optimized grinding process improves the particle size distribution of the calcium oxide expansion clinker powder, so that the particle size distribution of the calcium oxide expansion clinker powder forms a state of large middle and small two ends, and on the premise of ensuring the stability of the calcium oxide expansion clinker powder, the ineffective expansion of the calcium oxide expansion clinker powder in the plastic phase of the concrete is reduced, and the effective expansion of the calcium oxide expansion clinker powder in the hardening phase of the concrete is improved.
As can be seen from the data in table 2, as the mixing amount of the calcium oxide expansion clinker increases, the limiting expansion rate of the expansion agent product in the examples is obviously increased, wherein the limiting expansion rate of the expansion agent prepared by compounding when the mass ratio of the calcium oxide expansion clinker to the anhydrite is 30:70 in the examples is equivalent to the limiting expansion rate of the expansion agent prepared by grinding together when the mass ratio of the calcium oxide expansion clinker to the anhydrite is 50:50 in the comparative examples, and the limiting expansion rate of the expansion agent prepared by compounding when the mass ratio of the calcium oxide expansion clinker to the anhydrite is 50:50 in the examples is increased by about 60 percent. Compared with the comparative example 4, the invention prepares the expanding agent by grinding the calcium oxide expansion clinker and the anhydrite together, and prepares the expanding agent by the way of mixing and compounding the calcium oxide expansion clinker and the anhydrite, when the compounding proportion is the same, the limiting expansion rate of the expanding agent can be obviously improved, and when the expansion rate is the same, the compounding mixing amount of the calcium oxide expansion clinker can be obviously reduced, thereby achieving the purposes of low mixing and high efficiency.
Claims (3)
1. The grinding process for improving the expansion efficiency of the calcium oxide expansion clinker is characterized in that a grinding device adopted by the process comprises a raw calcium oxide expansion clinker bin (1), a roller press (2), a primary frequency conversion powder concentrator (3), a vertical mill (4), a secondary frequency conversion powder concentrator (5), a dust collector (6) and a finished calcium oxide expansion clinker bin (7);
The lower part of the roller press (2) is provided with screening equipment (22), a coarse particle discharge port (23) and a fine particle discharge port (24), wherein the coarse particle discharge port (23) is positioned above the screening equipment (22), and the fine particle discharge port (24) is positioned below the screening equipment (22);
The primary frequency conversion powder concentrator (3) is provided with a primary frequency conversion powder concentrator feed inlet (31), a primary frequency conversion powder concentrator fine powder discharge outlet (32) and a primary frequency conversion powder concentrator coarse powder discharge outlet (33);
A vertical mill feed inlet (41) and a vertical mill discharge outlet (42) are arranged on the vertical mill (4);
The secondary variable frequency powder selector (5) is provided with a secondary variable frequency powder selector feed inlet (51), a secondary variable frequency powder selector fine powder discharge outlet (52) and a secondary variable frequency powder selector coarse powder discharge outlet (53);
Wherein a blanking port (11) of the calcium oxide expansion clinker raw material bin arranged below the calcium oxide expansion clinker raw material bin (1) is connected with a feeding port (21) of a roller press arranged above the roller press (2) through conveying equipment; the coarse particle discharge port (23) of the roller press is connected with the feeding port (21) of the roller press through conveying equipment, and the fine particle discharge port (24) of the roller press is connected with the feeding port (31) of the primary frequency conversion powder concentrator through conveying equipment; the fine powder discharge port (32) of the primary frequency conversion powder concentrator is connected with the dust collector (6) through conveying equipment, and the coarse powder discharge port (33) of the primary frequency conversion powder concentrator is connected with the feed port (41) of the vertical mill through conveying equipment; the vertical mill discharging hole (42) is connected with the secondary variable frequency powder concentrator feeding hole (51) through conveying equipment, the secondary variable frequency powder concentrator fine powder discharging hole (52) is connected with the dust collector (6) through conveying equipment, and the secondary variable frequency powder concentrator coarse powder discharging hole (53) is connected with the vertical mill feeding hole (41) through conveying equipment; a dust collector discharge port (61) arranged below the dust collector (6) is connected with a calcium oxide expansion clinker finished product bin (7) through conveying equipment;
the method comprises the following steps:
(1) The calcium oxide expansion clinker is put into a roller press for pre-grinding treatment, the rotating speed of the roller press is controlled to be 1.4m/s-1.6m/s, coarse particles with the particle size more than or equal to 3mm are screened out through screening equipment after the calcium oxide expansion clinker is extruded by the roller press, and the coarse particles are returned to the roller press for re-extrusion until all calcium oxide expansion clinker particles are ground into fine particles with the particle size less than 3 mm;
(2) Adopting a primary frequency conversion powder concentrator to carry out powder concentration treatment on the fine particles with the particle diameter smaller than 3mm screened in the step (1), wherein the fine powder with the particle diameter smaller than or equal to 0.10mm is directly sent into a calcium oxide expansion clinker finished product bin for storage after being collected by a dust collector, and coarse powder with the particle diameter larger than 0.10mm is sent into a vertical mill;
(3) Feeding the coarse powder of the calcium oxide expansion clinker separated in the step (2) and with the particle size of more than 0.10mm and less than 3mm into a vertical mill for deep grinding to obtain the deeply ground calcium oxide expansion clinker powder, wherein the grinding disc pressure of the vertical mill is controlled to be 750KN-850KN, and the grinding disc rotating speed is controlled to be 18r/min-22r/min;
(4) And (3) carrying out powder selecting and regulating treatment on the calcium oxide expansion clinker powder subjected to deep grinding in the step (3) by adopting a two-stage variable frequency powder selector, returning coarse powder with the particle size of more than 0.10mm to a vertical mill for continuous grinding, collecting fine powder with the particle size of less than or equal to 0.10mm by a dust collector, and directly sending the fine powder into a calcium oxide expansion clinker finished product bin for storage.
2. A grinding process according to claim 1, characterized in that: when the particle size distribution of each section of the calcium oxide expansion clinker powder prepared in the step (4) is calculated according to the mass percent of screen residue, the particle size is controlled to be 0-0.03mm 10-20%, 0.03-0.10mm 70-80%, 0.10-0.15mm 5-10% and more than 0.15mm0-5%.
3. An expanding agent prepared from the calcium oxide expanded clinker powder prepared by the grinding process of claim 2, which is characterized in that: the calcium oxide expansion clinker powder and the gypsum powder are mixed and compounded according to the mass ratio of 20-60:40-80;
the gypsum powder is ground by anhydrite in a ball mill until the grain fineness is within 10 percent of the screen residue of a sieve with 0.045 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910360795.XA CN109999979B (en) | 2019-04-30 | 2019-04-30 | Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910360795.XA CN109999979B (en) | 2019-04-30 | 2019-04-30 | Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109999979A CN109999979A (en) | 2019-07-12 |
| CN109999979B true CN109999979B (en) | 2024-04-26 |
Family
ID=67175218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910360795.XA Active CN109999979B (en) | 2019-04-30 | 2019-04-30 | Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109999979B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405644B (en) * | 2022-01-21 | 2023-09-26 | 上海山美环保装备股份有限公司 | Dry aggregate pre-sorting system and building-type sand making process system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1123383A (en) * | 1982-02-10 | 1983-08-18 | Rice, E.K. | Expansive cement |
| US4592512A (en) * | 1983-04-19 | 1986-06-03 | Klockner-Humboldt-Deutz Ag | Method and apparatus for the common grinding of two or more brittle materials having different grinding properties |
| CN101596483A (en) * | 2009-06-26 | 2009-12-09 | 南京凯盛水泥技术工程有限公司 | A kind of material grinding system |
| CN101746977A (en) * | 2008-12-11 | 2010-06-23 | 李宪章 | Process for manufacturing multipoint feeding difference powder concrete |
| CN107930823A (en) * | 2017-11-13 | 2018-04-20 | 盐城吉达环保设备有限公司 | One kind series connection powder concentrator grinding system technique |
| CN210386128U (en) * | 2019-04-30 | 2020-04-24 | 镇江苏博特新材料有限公司 | Grinding device for improving expansion efficiency of calcium oxide expansion clinker |
-
2019
- 2019-04-30 CN CN201910360795.XA patent/CN109999979B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1123383A (en) * | 1982-02-10 | 1983-08-18 | Rice, E.K. | Expansive cement |
| US4592512A (en) * | 1983-04-19 | 1986-06-03 | Klockner-Humboldt-Deutz Ag | Method and apparatus for the common grinding of two or more brittle materials having different grinding properties |
| CN101746977A (en) * | 2008-12-11 | 2010-06-23 | 李宪章 | Process for manufacturing multipoint feeding difference powder concrete |
| CN101596483A (en) * | 2009-06-26 | 2009-12-09 | 南京凯盛水泥技术工程有限公司 | A kind of material grinding system |
| CN107930823A (en) * | 2017-11-13 | 2018-04-20 | 盐城吉达环保设备有限公司 | One kind series connection powder concentrator grinding system technique |
| CN210386128U (en) * | 2019-04-30 | 2020-04-24 | 镇江苏博特新材料有限公司 | Grinding device for improving expansion efficiency of calcium oxide expansion clinker |
Non-Patent Citations (1)
| Title |
|---|
| 分别粉磨工艺的水泥性能;张大康;;水泥(08);第9-14页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109999979A (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108025314B (en) | Method and apparatus for preparing and activating green stock | |
| EP2790837B1 (en) | Grinding process and unit, and corresponding production process of a hydraulic binder | |
| AU2020103181A4 (en) | Method for Preparing Steel Slag-Slag-Gypsum Composite Cementitious Material by Mixed Grinding | |
| CN111253093B (en) | Cementing material containing coal-to-liquid coarse slag and preparation method thereof | |
| CN101182138A (en) | Steel slag property optimized handling method | |
| CN111362599B (en) | Mixed grinding preparation method of steel slag-gypsum composite cementing material | |
| CN109354423A (en) | A kind of clinker portland cement and preparation method thereof | |
| CN108892401A (en) | A kind of method and clinker of ardealite calcining belite sulphoaluminate cement clinker | |
| CN105314902A (en) | Method for calcining belite sulphoaluminate cement clinker by totally utilizing industrial waste residues | |
| CN210386128U (en) | Grinding device for improving expansion efficiency of calcium oxide expansion clinker | |
| CN113121131A (en) | Cement clinker produced by using low-grade marble limestone and preparation method thereof | |
| CN110183120B (en) | Method for producing cement active admixture by using undisturbed electrolytic manganese slag and steel slag tail mud | |
| CN113213802A (en) | High-performance concrete admixture and production method thereof | |
| CN102936104B (en) | Method for preparing rapid hardening high-early-strength cement clinker | |
| AU2020103182A4 (en) | Cementitious Material Containing Coal-to-liquids Coarse Slag and Preparation Method Thereof | |
| CN109999979B (en) | Grinding device and process for improving expansion efficiency of calcium oxide expansion clinker | |
| CN103992049B (en) | Bessemer furnace slag is utilized to correct the cement clinker preparation method of irony | |
| CN110066127B (en) | Calcium-magnesium composite expanding agent for ultra-long and ultra-thick structural concrete and preparation method thereof | |
| CN105130237B (en) | Cement-based material swelling agent and preparation method thereof | |
| CN111533440A (en) | Production method of calcined kaolin for glass fibers | |
| CN114835132B (en) | High-efficiency energy-saving process for processing coal-series kaolin by dry and wet method | |
| CN117164319A (en) | Lithium slag baking-free ceramsite filter material and preparation method thereof | |
| CN109455960A (en) | A kind of process of preparing and production equipment of slag micropowder | |
| CN112456826B (en) | Method for improving cement workability by using tailing powder | |
| CN107540250A (en) | A kind of Pre-sorting slag split-phase clinker cement production technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |