CN114804803A - High-strength moisture-proof gypsum block for wall and preparation method thereof - Google Patents
High-strength moisture-proof gypsum block for wall and preparation method thereof Download PDFInfo
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- CN114804803A CN114804803A CN202210467167.3A CN202210467167A CN114804803A CN 114804803 A CN114804803 A CN 114804803A CN 202210467167 A CN202210467167 A CN 202210467167A CN 114804803 A CN114804803 A CN 114804803A
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- phosphogypsum
- gypsum
- block
- wall
- strength moisture
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- 239000010440 gypsum Substances 0.000 title claims abstract description 105
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 105
- 238000002360 preparation method Methods 0.000 title claims description 21
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 8
- 108090000623 proteins and genes Proteins 0.000 claims description 8
- 102000004169 proteins and genes Human genes 0.000 claims description 8
- 238000004537 pulping Methods 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 7
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 7
- 239000011449 brick Substances 0.000 claims description 7
- 150000004683 dihydrates Chemical class 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 7
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 7
- 239000011976 maleic acid Substances 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000007790 scraping Methods 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 18
- 239000004567 concrete Substances 0.000 description 9
- 239000002686 phosphate fertilizer Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000011268 mixed slurry Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 229920006389 polyphenyl polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/02—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls built-up from layers of building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C1/00—Building elements of block or other shape for the construction of parts of buildings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-strength moisture-proof gypsum block for a wall, which is prepared from the following raw materials in parts by weight: 85-95 parts of phosphogypsum-based gypsum powder, 3-5 parts of vitrified micro bubbles, 0.1-0.3 part of water reducing agent and 0.05-0.15 part of retarder. The building block is not easy to expand, damage, crack and grow mildews, effectively prevents moisture from invading a wall body to be swelled and cracked, prolongs the service life of the building block, and solves the problems of damage rate and appearance quality in the transportation process; the building block has good moisture-proof effect, can be used in the wall of a house and an area with large water consumption of an indoor toilet, and solves the problem that gypsum building blocks cannot be used in places with large water consumption and humidity such as houses.
Description
Technical Field
The invention belongs to the technical field of concrete blocks, and particularly relates to a high-strength moisture-proof gypsum block for a wall and a preparation method thereof.
Background
The chemical fertilizer industry is one of the important industries of chemical industry and national economy, and is related to national food safety, agricultural development, farmer benefits, and sustainable development of resources and environment. The phosphate fertilizer is one of three chemical fertilizer varieties, is an important support of agriculture, is an important basic industry related to the national civilization, and has very important effect on guaranteeing national grain safety, agricultural product quality safety and agricultural ecological safety. Phosphoric acid is an important basic raw material for producing phosphate fertilizer, phosphogypsum is a main byproduct of extracting phosphoric acid by decomposing phosphate rock with sulfuric acid, the main component of the phosphogypsum is the same as that of natural gypsum, and the phosphogypsum is calcium sulfate dihydrate (CaSO) 4 ·2H 2 O), is a renewable gypsum resource. The phosphogypsum is acidic and contains a small amount of impurities such as phosphorus, fluorine and the like, which has certain influence on the stockpiling and the comprehensive utilization of the phosphogypsum. The main production route of phosphogypsum is phosphate fertilizer production, which accounts for about 85% of the total yield, and in addition, phosphorus chemical products, calcium feeds and the like which take wet-process phosphoric acid as raw materials also have the byproduct phosphogypsum production. The byproducts of the industrial production, namely the desulfurized gypsum, the phosphogypsum and the titanium gypsum, are respectively sourced from flue gas desulfurization of a coal-fired power plant, fertilizer production and titanium dioxide production.
The comprehensive utilization of the phosphogypsum is a worldwide problem, the current global phosphogypsum stockpiling is over 60 hundred million t, and the worldwide phosphogypsum stockpiling still continues to increase at the rate of about 2 hundred million t every year, but the global phosphogypsum comprehensive utilization rate is only about 25 percent, and most of the phosphogypsum is mainly treated in a stockpiling mode. The annual output of the phosphogypsum in China accounts for about 40 percent of that of the industrial byproduct gypsum, and the generation of the phosphogypsum and the output of the phosphate fertilizer are inseparable. The peak year 2015 is the peak year of the yield of the phosphate fertilizer in China, the yield of the phosphogypsum in the same year also reaches the highest value (8000 ten thousand t) in history, the yield of the phosphogypsum is reduced to a certain extent, and the level of the yield of the phosphogypsum is still kept at about 7500 ten thousand t. The province with the highest utilization rate of the phosphogypsum in China is Anhui province and Guizhou province, the comprehensive utilization rate exceeds 100 percent, and the Anhui province is in the eastern region, has larger market, less yield and higher comprehensive utilization rate; the comprehensive utilization rate of the phosphogypsum is greatly improved since 2018 in Guizhou province. In the present year, the resource utilization process of the phosphogypsum in China is basically mature, part of key common technologies are broken through and applied, the method mainly takes the primary utilization approaches of cement retarders and various building material products and the like, and in addition, a small amount of the method is also applied to phosphogypsum soil conditioners, phosphogypsum-to-sulfuric acid and the like.
However, the historical stockpiling amount of the Chinese phosphogypsum is large, and according to the statistics of the China association for complex phosphate fertilizer industry, as far as 2020, China accumulates more than 8.3 hundred million tons of phosphogypsum, and the stockpiling of the phosphogypsum not only occupies a large amount of land, but also has certain environmental risk and potential safety hazard. At present, the existing phosphogypsum storage yard of the main phosphate fertilizer production enterprise in China is expected to be fully stockpiled within 2-3 years, a few storage yards are no more than 5 years, and the enterprise faces a situation where no place can be stockpiled after the storage yards are fully stockpiled. As solid waste, the waste gypsum accumulated in large quantity not only occupies valuable land resources, but also brings pollution to soil, water and atmosphere to different degrees. The desulfurized gypsum is taken as an example, the annual output of the desulfurized gypsum in China is more than 7000 million tons, and the comprehensive utilization rate of the desulfurized gypsum is about 70 percent, so that the desulfurized gypsum in China is massively stockpiled. Compared with desulfurized gypsum, the phosphogypsum and titanium gypsum have more impurities, larger comprehensive reserves and higher recycling difficulty.
The concrete block is a novel wall filling material which utilizes waste and saves energy, and has the advantages of light weight, heat preservation, heat insulation, sound absorption and insulation, shock resistance, fire resistance and the like. At present, the method for producing concrete blocks by using phosphogypsum has some relevant documents, such as:
1. patent application CN201811523477.2 discloses a preparation method of an autoclaved aerated phosphogypsum-based concrete block, which comprises the following steps: preparing materials: 40-60 parts of phosphogypsum, 5-15 parts of slag powder, 5-10 parts of carbide slag, 5-15 parts of fly ash, 25-40 parts of cement, 0.1-0.15 part of silica sol and 0.07-0.1 part of aluminum paste; adding the raw materials into a stirring tank, adding hot water, stirring, adding aluminum powder paste, and stirring to obtain mixed slurry; discharging the mixed slurry from the stirring tank at once, flowing into a steel mould through a chute, and delivering the mixed slurry to a maintenance area for foaming and hardening through a track after the completion of pouring; cutting the cured and hardened castable into building blocks, and moisturizing and curing at normal temperature; then moved into a natural drying and dewatering area through a track for stacking, and a finished product can be obtained after the detection is qualified. The method can fully utilize industrial byproducts, reduce investment and energy consumption, and the prepared product has good quality and is not easy to crack. Solves the problems of large one-time investment, higher energy consumption and easy cracking of the aerated phosphogypsum-based concrete block in the prior art.
2. Patent application CN202110261092.9 discloses a production method of an autoclaved aerated phosphogypsum concrete block, which comprises the following steps: (1) mixing 45-55 parts of phosphogypsum, 30 parts of silica sand and 20 parts of water according to the mass ratio, and then performing ball milling, pulping and storing for later use; (2) mixing 0.08 part of aluminum powder, 10 parts of cement and 10 parts of lime, stirring for 60s, injecting the slurry into a mold, placing the mold into a 45 ℃ oven, standing for 1-2 hours, demolding, and cutting off the redundant part on the upper part of the blank by using a cutting machine; (3) and (5) putting the blank into an autoclave for autoclave curing. The phosphogypsum contains a large amount of SiO 2 And a certain amount of CaO, which is a potential active material, the vitreous minerals of the CaO are easily activated under alkaline conditions to form CSH gel minerals similar to cement hydration, and the CaO can play a dual role of filling and gelling.
At present, gypsum building materials are widely popularized in China, and on the basis that wall buildings use a large amount of gypsum, in order to increase the consumption of the phosphogypsum, a series of adverse effects can be caused when gypsum blocks produced by common processes on the market are used for house decoration, such as: the hanging force and the bearing degree of the common gypsum block and the wall are not firm and water seepage causes unnecessary potential safety hazards, if the wall is damaged or water seepage causes great potential safety hazards, the bearing force is poor, and the waterproof performance is poor.
Disclosure of Invention
The invention provides a high-strength moisture-proof gypsum block for a wall and a preparation method thereof to solve the technical problems. This application dampproofing gypsum building block that excels in then can be abundant avoid building block and wall body hang power and bearing degree insecure and infiltration lead to unnecessary similar condition such as potential safety hazard to take place.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a high-strength moisture-proof gypsum block for a wall body is prepared from the following raw materials in parts by weight: 85-95 parts of phosphogypsum-based gypsum powder, 3-5 parts of vitrified micro bubbles, 0.1-0.3 part of water reducing agent and 0.05-0.15 part of retarder.
Further, the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly CaSO 4 ·2H 2 The preparation method of the offwhite powder comprises the following specific preparation process flows of calcining and drying O by a heat source to obtain the offwhite powder: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin.
Furthermore, the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology.
The vitrified micro bubbles are irregular spherical particles, have an internal porous cavity structure, have sealed surface vitrification, smooth gloss and stable physical and chemical properties, have the excellent characteristics of light weight, heat insulation, fire prevention, high and low temperature resistance, aging resistance, low water absorption and the like, can replace a plurality of traditional lightweight aggregates such as fly ash floating beads, glass micro bubbles, expanded perlite, polyphenyl particles and the like to be applied to different products, and are an environment-friendly high-performance novel inorganic lightweight heat-insulating vitreous mineral material.
Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and is mainly prepared from unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like. The polycarboxylic acid high-performance water reducing agent has the characteristics of super-dispersion type, good fluidity retentivity, good comprehensive technical performance advantage and environmental protection.
Further, the retarder is obtained by treating and modifying based on protein.
The peptide bonds in the retarder have strong metal ion complexing capability, and limit the diffusion of calcium ions to the hemihydrate gypsum, thereby reducing the dissolution rate of the hemihydrate gypsum. The action of retarders is directly related to their molecular weight and molecular structure. When the natural protein is directly used as a gypsum retarder, the effect is very limited, and the performance of the gypsum retarder can be improved by chemical modification. The gypsum retarder has strong hydrophilicity and is extremely easy to absorb moisture, and how to prepare retarder mother liquor into powder is also a problem which is difficult to solve.
Further, the preparation method of the high-strength moisture-proof gypsum block for the wall comprises the following steps:
(1) mixing materials: according to the weight portion ratio, putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device, and uniformly stirring and mixing to obtain a mixed material;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after pouring is finished, and waiting for 5-10 min until the slurry is hardened into a building block;
(4) and (4) natural maintenance: and placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural maintenance to obtain the high-strength moisture-proof gypsum building blocks for the wall.
Further, in the step (1), the rotating speed of the stirring is 300-350 r/min, and the time is 20-30 min.
Further, in the step (2), the rotating speed of the slow stirring is 100-150 r/min, and the time is 60-90 s; the rotating speed of the rapid stirring is 450-500 r/min, and the time is 60-120 s.
Further, in the step (2), the addition amount of the deionized water is 25-35% of the phosphogypsum-based gypsum powder mixture.
Further, in the step (4), the natural curing is dry and ventilated natural curing at room temperature, and the curing time is 3-5 days.
The phosphogypsum base material is adopted to replace common gypsum blocks on the market, 25-35% of water is added to each kilogram of high-strength moisture-proof gypsum block powder, a high-speed forced stirrer is used for stirring for 120-240 s, and the stirred gypsum blocks are cast in a mould according to forming equipment and are formed during final setting, so that the strength and the moisture resistance of the gypsum blocks are improved, and the problem of expansion and cracking of the blocks caused by the fact that water is soaked in the gypsum blocks is solved.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the invention, through scientific proportioning of raw materials, the phosphogypsum building block has stronger strength than a common gypsum building block, and has firmer hanging force and bearing degree; the building blocks are not easy to damage, crack and grow mildews, so that water is effectively prevented from entering wall bodies to crack and grow mildews, the service life of the building blocks is prolonged, and the problems of damage rate and appearance quality in the transportation process are solved; the building block has good moisture-proof effect, can be used in the wall of a house and an area with large water consumption of an indoor toilet, and solves the problem that gypsum building blocks cannot be used in places with large water consumption and humidity such as houses.
The high-strength moisture-proof gypsum block increases the self hanging force, bearing capacity and moisture-proof performance on the basis of the common gypsum block, can be used for decorating the building wall and the area with large water consumption of an indoor toilet instead of the common gypsum block on the market, effectively prevents the water in the water using process from invading the wall to be swelled and cracked, improves the service life of the block, and solves the problems that the gypsum block cannot be used in the places with large water consumption and humidity, such as a house, and the breakage rate and the appearance quality in the transportation process.
Because the light weight of the common gypsum block is not high-strength and can not be protected against moisture, and the light weight of the common gypsum block can not be high-strength and can be protected against moisture, the phosphogypsum base is used for replacing a common cement concrete wall as a main material, the quality index requirements of other raw materials can be properly relaxed under the condition of producing products with the same quality, the utilization and consumption of the phosphogypsum are increased, the quality of the gypsum block can be improved, particularly, the improvement of the moisture resistance of the wall body enables the phosphogypsum base gypsum block to be more suitable for the application of an assembly type building, and the moisture resistance, the firmness and the service life of the phosphogypsum base gypsum block are increased.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
A high-strength moisture-proof gypsum block for a wall is prepared from the following raw materials in parts by weight: 85 parts of phosphogypsum-based gypsum powder, 3 parts of vitrified micro bubbles, 0.1 part of water reducing agent and 0.05 part of retarder.
Further, the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly through CaSO 4 ·2H 2 The preparation process of the offwhite powdery material comprises the following steps: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin; the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology; the water reducing agent is a polycarboxylic acid high-performance water reducing agent and mainly comprises unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like to prepare a finished product; the retarder is obtained by treating and modifying protein as a base.
The preparation method of the high-strength moisture-proof gypsum block for the wall comprises the following steps:
(1) mixing materials: according to the weight portion ratio, putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device, and uniformly stirring and mixing to obtain a mixed material; the rotating speed of the stirring is 300r/min, and the time is 30 min; the rotating speed of the slow stirring is 100r/min, and the time is 90 s; the rotating speed of the rapid stirring is 450r/min, and the time is 60 s;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry; the addition amount of the deionized water is 25 percent of the phosphogypsum-based gypsum powder mixture;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after the pouring is finished, and waiting for 5min until the slurry is hardened into a building block;
(4) and (4) natural maintenance: placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural curing to obtain the high-strength moisture-proof gypsum building blocks for the wall; and the natural curing is dry, ventilated and natural curing at room temperature, and the curing time is 3 d.
Example 2
A high-strength moisture-proof gypsum block for a wall body is prepared from the following raw materials in parts by weight: 95 parts of phosphogypsum-based gypsum powder, 5 parts of vitrified micro bubbles, 0.3 part of water reducing agent and 0.15 part of retarder.
Further, the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly through CaSO 4 ·2H 2 The preparation process of the offwhite powdery material comprises the following steps: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin; the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology; the water reducing agent is a polycarboxylic acid high-performance water reducing agent and mainly comprises unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like to prepare a finished product; the retarder is obtained by treating and modifying protein as a base.
The preparation method of the high-strength moisture-proof gypsum block for the wall comprises the following steps:
(1) mixing materials: according to the weight portion ratio, putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device, and uniformly stirring and mixing to obtain a mixed material; the stirring speed is 350r/min, and the time is 20 min; the rotating speed of the slow stirring is 150r/min, and the time is 60 s; the rotating speed of the rapid stirring is 500r/min, and the time is 60 s;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry; the addition amount of the deionized water is 35% of the phosphogypsum-based gypsum powder mixture;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after the pouring is finished, and waiting for 10min until the slurry is hardened into a building block;
(4) and (4) natural maintenance: placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural curing to obtain the high-strength moisture-proof gypsum building blocks for the wall; and the natural curing is dry, ventilated and natural curing at room temperature, and the curing time is 5 d.
Example 3
A high-strength moisture-proof gypsum block for a wall body is prepared from the following raw materials in parts by weight: 88 parts of phosphogypsum-based gypsum powder, 3.5 parts of vitrified micro bubbles, 0.15 part of water reducing agent and 0.08 part of retarder.
Further, the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly through CaSO 4 ·2H 2 The preparation process of the offwhite powdery material comprises the following steps: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin; the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology; the water reducing agent is a polycarboxylic acid high-performance water reducing agent and mainly comprises unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like to prepare a finished product; the retarder is obtained by treating and modifying protein as a base.
The preparation method of the high-strength moisture-proof gypsum block for the wall comprises the following steps:
(1) mixing materials: according to the weight portion ratio, putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device, and uniformly stirring and mixing to obtain a mixed material; the stirring speed is 320r/min, and the time is 28 min; the rotating speed of the slow stirring is 120r/min, and the time is 80 s; the rotating speed of the rapid stirring is 460r/min, and the time is 110 s;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry; the addition amount of the deionized water is 28 percent of the phosphogypsum-based gypsum powder mixture;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after the pouring is finished, and waiting for 6min until the slurry is hardened into a building block;
(4) and (4) natural maintenance: placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural curing to obtain the high-strength moisture-proof gypsum building blocks for the wall; and the natural curing is dry, ventilated and natural curing at room temperature, and the curing time is 3.5 d.
Example 4
A high-strength moisture-proof gypsum block for a wall body is prepared from the following raw materials in parts by weight: 93 parts of phosphogypsum-based gypsum powder, 4.5 parts of vitrified micro bubbles, 0.25 part of water reducing agent and 0.13 part of retarder.
Further, the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly through CaSO 4 ·2H 2 The preparation process of the offwhite powdery material comprises the following steps: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin; the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology; the water reducing agent is a polycarboxylic acid high-performance water reducing agent and mainly comprises unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like to prepare a finished product; the retarder is obtained by treating and modifying protein as a base.
The preparation method of the high-strength moisture-proof gypsum block for the wall comprises the following steps:
(1) mixing materials: putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device according to the weight part ratio, and uniformly stirring and mixing to obtain a mixed material; the stirring speed is 340r/min, and the time is 22 min; the rotating speed of the slow stirring is 140r/min, and the time is 70 s; the rotating speed of the rapid stirring is 490r/min, and the time is 70 s;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry; the addition amount of the deionized water is 33 percent of that of the phosphogypsum-based gypsum powder mixture;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after the pouring is finished, and waiting for 9min until the slurry is hardened into a building block;
(4) and (4) natural maintenance: placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural curing to obtain the high-strength moisture-proof gypsum building blocks for the wall; and the natural curing is dry, ventilated and natural curing at room temperature, and the curing time is 4.5 d.
Example 5
A high-strength moisture-proof gypsum block for a wall body is prepared from the following raw materials in parts by weight: 90 parts of phosphogypsum-based gypsum powder, 4 parts of vitrified micro bubbles, 0.2 part of water reducing agent and 0.10 part of retarder.
Further, the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly through CaSO 4 ·2H 2 The preparation process of the offwhite powdery material comprises the following steps: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin; the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology; the water reducing agent is a polycarboxylic acid high-performance water reducing agent and mainly comprises unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like to prepare a finished product; the retarder is obtained by treating and modifying protein as a base.
The preparation method of the high-strength moisture-proof gypsum block for the wall comprises the following steps:
(1) mixing materials: according to the weight portion ratio, putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device, and uniformly stirring and mixing to obtain a mixed material; the stirring speed is 325r/min, and the time is 25 min; the rotating speed of the slow stirring is 125r/min, and the time is 75 s; the rotating speed of the rapid stirring is 475r/min, and the time is 90 s;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry; the addition amount of the deionized water is 30 percent of the phosphogypsum-based gypsum powder mixture;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after the pouring is finished, and waiting for 7.5min until the slurry is hardened into a building block;
(4) and (4) natural maintenance: placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural curing to obtain the high-strength moisture-proof gypsum building blocks for the wall; and the natural curing is dry, ventilated and natural curing at room temperature, and the curing time is 4 d.
Comparative example 1
The difference from the embodiment 1 is that: the retarder is a cement retarder, and other conditions are unchanged.
Comparative example 2
The blocks were prepared according to the method in patent application CN201811523477.2 (a preparation method of autoclaved aerated phosphogypsum-based concrete blocks).
Comparative example 3
The blocks were prepared according to the method in patent application CN202110261092.9 (a method for producing autoclaved aerated phosphogypsum concrete blocks).
The method of examples 1 to 5 and comparative examples 1 to 3 were used to prepare blocks, respectively, and then the apparent density (kg/m) thereof was measured 3 ) The breaking load (N), the water absorption and the softening coefficient, and simultaneously, the cost required for preparing the same building block is recorded, and the specific experimental results are shown in the following table 1:
TABLE 1
As can be seen from Table 1, the density of the block obtained in examples 1 to 5 was high, the block hardness was high, and the water resistance was satisfactory. In practical application, the building blocks prepared in comparative examples 1-3 are found to be easy to damage in transportation, for example, the wall body is cracked and damaged, and the building blocks are easy to grow mildews when meeting water. However, in any of examples 1 to 5, the above-mentioned situation does not occur.
Therefore, the high-strength moisture-proof gypsum block increases the hanging force, the bearing weight and the moisture-proof performance of the high-strength moisture-proof gypsum block on the basis of the common gypsum block, can be used for decorating the building wall and the area with large water consumption of an indoor toilet instead of the common gypsum block on the market, effectively prevents the water from invading the wall to be swelled and cracked in the water consumption process, improves the service life of the block, and solves the problems that the gypsum block cannot be used in the places with large water consumption, such as a house, and the like, and the damage rate and the appearance quality in the transportation process.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A high-strength moisture-proof gypsum block for a wall is characterized by being prepared from the following raw materials in parts by weight: 85-95 parts of phosphogypsum-based gypsum powder, 3-5 parts of vitrified micro bubbles, 0.1-0.3 part of water reducing agent and 0.05-0.15 part of retarder.
2. The high-strength moisture-proof gypsum block for the wall body as claimed in claim 1, wherein: the main component of the phosphogypsum-based gypsum powder is CaSO 4 ·1/2H 2 O, it is mainly through CaSO 4 ·2H 2 The preparation process of the offwhite powdery material comprises the following steps: dihydrate phosphogypsum → feeding belt, prebaking → calcining kiln → gas-solid separator → modified mill → bucket elevator → feeding finished product bin.
3. A high strength moisture proof gypsum block for wall body according to claim 1, wherein: the vitrified micro bubbles are processed by a multistage silicon carbide electric heating tube type production process technology.
4. A high strength moisture proof gypsum block for wall body according to claim 1, wherein: the water reducing agent is a polycarboxylic acid high-performance water reducing agent and mainly comprises unsaturated acid: maleic acid, maleic anhydride, acrylic acid, methacrylic acid and the like.
5. A high strength moisture proof gypsum block for wall body according to claim 1, wherein: the retarder is obtained by treating and modifying protein as a base.
6. The preparation method of the high-strength moisture-proof gypsum block for the wall according to any one of claims 1 to 5, characterized by comprising the following steps:
(1) mixing materials: putting the phosphogypsum-based gypsum powder, the vitrified micro bubbles, the water reducing agent and the retarder into a mixing device according to the weight part ratio, and uniformly stirring and mixing to obtain a mixed material;
(2) pulping: adding deionized water into the uniformly mixed materials, and stirring slowly and quickly by using a high-speed forced stirrer to prepare slurry;
(3) pouring: pouring the slurry into a building block mold, scraping off redundant slurry by using a scraper after pouring is finished, and waiting for 5-10 min until the slurry is hardened into a building block;
(4) and (3) natural maintenance: and placing the hardened and molded building blocks on a brick discharging track by using a gripper device, and delivering the building blocks to a ventilated and dried storage yard for natural maintenance to obtain the high-strength moisture-proof gypsum building blocks for the wall.
7. The method for preparing the high-strength moisture-proof gypsum block for the wall body as claimed in claim 6, wherein the method comprises the following steps: in the step (1), the rotating speed of stirring is 300-350 r/min, and the time is 20-30 min.
8. The method for preparing the high-strength moisture-proof gypsum block for the wall body as claimed in claim 6, wherein the method comprises the following steps: in the step (2), the rotating speed of the slow stirring is 100-150 r/min, and the time is 60-90 s; the rotating speed of the rapid stirring is 450-500 r/min, and the time is 60-120 s.
9. The method for preparing the high-strength moisture-proof gypsum block for the wall body as claimed in claim 6, wherein the method comprises the following steps: in the step (2), the addition amount of the deionized water is 25-35% of the phosphogypsum-based gypsum powder mixture.
10. The method for preparing the high-strength moisture-proof gypsum block for the wall body as claimed in claim 6, wherein the method comprises the following steps: and (4) naturally curing, namely drying, ventilating and naturally curing at room temperature for 3-5 d.
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| CN116462481A (en) * | 2023-05-04 | 2023-07-21 | 西南科技大学 | Phosphogypsum slat capable of preventing moss and mildew and preparation method thereof |
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