CN114956525A - Method for harmless and high-value utilization of FeO reinforced stainless steel slag in large quantity - Google Patents
Method for harmless and high-value utilization of FeO reinforced stainless steel slag in large quantity Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 74
- 239000010935 stainless steel Substances 0.000 title claims abstract description 74
- 239000002893 slag Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 59
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000919 ceramic Substances 0.000 claims abstract description 54
- 239000011521 glass Substances 0.000 claims abstract description 39
- 238000010899 nucleation Methods 0.000 claims abstract description 23
- 230000006911 nucleation Effects 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000002425 crystallisation Methods 0.000 claims abstract description 16
- 230000008025 crystallization Effects 0.000 claims abstract description 16
- 239000006121 base glass Substances 0.000 claims description 24
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 17
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 238000000498 ball milling Methods 0.000 claims description 11
- 239000006004 Quartz sand Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 7
- 239000006060 molten glass Substances 0.000 claims description 7
- 235000017550 sodium carbonate Nutrition 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000011651 chromium Substances 0.000 abstract description 63
- 239000013078 crystal Substances 0.000 abstract description 22
- 229910052804 chromium Inorganic materials 0.000 abstract description 19
- 238000002386 leaching Methods 0.000 abstract description 17
- 229910052596 spinel Inorganic materials 0.000 abstract description 16
- 239000011029 spinel Substances 0.000 abstract description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 15
- NWXHSRDXUJENGJ-UHFFFAOYSA-N calcium;magnesium;dioxido(oxo)silane Chemical compound [Mg+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O NWXHSRDXUJENGJ-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052637 diopside Inorganic materials 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 abstract description 4
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 abstract 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 238000001514 detection method Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 229910001430 chromium ion Inorganic materials 0.000 description 5
- 239000002241 glass-ceramic Substances 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 238000013112 stability test Methods 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 239000013081 microcrystal Substances 0.000 description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 210000004127 vitreous body Anatomy 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
- C03B32/02—Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0063—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing waste materials, e.g. slags
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a method for harmless and high-value utilization of a large amount of FeO reinforced stainless steel slag. The invention prepares the basic glass by melting the stainless steel slag, the industrial ferrous oxide and other raw materials, the basic glass is firstly subjected to nucleation heat treatment to obtain the nucleated glass, Cr in the basic glass can be promoted to form a large amount of fine nano-scale magnesium chromium (iron chromium) spinel crystal grains with low leaching rate in the nucleation heat treatment process by adjusting the content of the ferrous oxide in the glass, the function of strengthening and fixing chromium is achieved, and the nucleated glass is subjected to crystallization heat treatment to finally obtain the high-valued microcrystalline ceramic. The invention can treat stainless steel slag with a weight of more than 60%, and has good harmless treatment effect and large treatment capacity. When the FeO content was 4.8 wt%, 95.23 wt% of Cr in the stainless steel slag was present in the diopside crystals of the microcrystalline ceramic, and the Cr leaching concentration was only 0.009 mg/L. The obtained product microcrystalline ceramic has good chemical stability and mechanical property.
Description
Technical Field
The invention relates to a harmless treatment technology of metallurgical secondary resources, in particular to a method for harmless and high-value utilization of a large amount of FeO reinforced stainless steel slag.
Background
Stainless steel is used as an important production material and is widely applied in the fields of metallurgy, building, traffic, food, medical treatment and the like. The national stainless steel crude steel yield is 3013.9 ten thousand tons in 2020, and the produced stainless steel slag exceeds 900 ten thousand tons. The chromium element in the stainless steel slag is often Cr 3+ And a small amount of Cr 6+ A state exists. Research shows that the stainless steel slag is piled up in natural environment for a long time, and Cr 3+ Can be oxidized into Cr 6+ ，Cr 6+ Has high toxicity, is easily dissolved in water, and can permeate into the environment to cause harm to the environment and human body. Therefore, the stainless steel slag piled in large quantity severely restricts the production of the stainless steel industry, and whether the stainless steel slag can be harmlessly treated becomes the bottleneck of sustainable development of the stainless steel manufacturing industry. At present, the harmless and high-value utilization of a large amount of stainless steel slag becomes an important problem which is urgently needed to be solved by the industry.
The microcrystal ceramic is a polycrystal solid material containing a large number of microcrystal phases and glass phases, which is prepared by carrying out nucleation and crystallization on base glass with a specific composition in a heating process. Compared with common glass, the microcrystal ceramic has the advantages of high mechanical strength, good wear resistance, stable chemical property and the like, so that the microcrystal ceramic is widely applied to a plurality of fields of buildings, chemical engineering, medical treatment and the like. Because the main chemical components of the stainless steel slag are similar to those of microcrystalline ceramics, and the chromium oxide in the slag can be used as a main nucleating agent for preparing the microcrystalline ceramics, the chromium in the slag can be solidified by using the stainless steel slag to prepare the microcrystalline ceramics, and the method is an effective way for realizing harmless and high-value utilization of the stainless steel slag.
The traditional stainless steel slag is most harmlessly cured by a curing method. The cement solidification method is that the stainless steel slag and other solid waste are mixed and added with cement to be wrapped by the cement. The method has the advantages of large treatment capacity of the stainless steel slag and convenient operation, wherein the defect is that the solidification degree of Cr is not high enough. The invention discloses a method for harmless treatment of stainless steel slag by molten blast furnace slag at high temperature (patent No. 201611053294X), which comprises the steps of adding the stainless steel slag into the molten blast furnace slag, heating by electrifying, stirring, and quenching by water to obtain mixed slag vitreous body, so that heavy metal Cr is fixed in the mixed slag vitreous body. When the addition amount of the stainless steel slag is 40 wt%, the leaching concentration of Cr in glassy slag is 0.03mg/L, and the slag has a certain Cr solidification effect, but the obtained product has low additional value and cannot be directly used as a building material.
The article published by Ouyang, etc. "preparation of glass ceramics by using stainless steel slag: crystal structure and solidification of heavy metal chromium "(" scientific report ", 2019,9(1): 1-9): [ Preparation of Glass-ceramic Using Chromium-containing stainless Steel slab [ Scientific Reports, 2019,9(1):1-9) ] discloses that the Glass-ceramic prepared by Using 0-20 wt% of stainless steel slag has a compressive strength of 222.9MPa and a Vickers hardness of 729.27 HV. The utilization rate of the stainless steel slag in the article is low by about 20 wt%, and the mechanical property of the prepared microcrystalline glass is not high enough.
Disclosure of Invention
The invention aims to provide a method for harmless and high-value utilization of a large amount of FeO reinforced stainless steel slag. Stainless steel slag and other raw materials are melted to prepare base glass, the base glass is firstly subjected to nucleation heat treatment, and the added ferrous oxide can promote Cr in the base glass to form nano-scale magnesia-chromite spinel and ferrochrome spinel grains with low leaching rate in the nucleation heat treatment process, so that the nucleated glass is obtained, and the purpose of primarily strengthening and fixing the chromium is realized (as shown in figure 1); then carrying out crystallization heat treatment on the nucleated glass, taking the nano chromium spinel crystal grains as heterogeneous nuclei to induce and separate out diopside crystal phases (as shown in figure 2), wherein Cr in the nano chromium spinel crystal grains is diffused into diopside, and meanwhile Cr in the glass phase is gradually diffused into diopside crystal lattices along with the generation of the diopside, so that more Cr is solidified, further the strengthening and the fixing of Cr are achieved, and the harmless effect of the stainless steel slag is greatly improved. With the addition of a proper amount of ferrous oxide, the number of nano-scale magnesia-chrome spinel and ferrochrome spinel crystal grains can be obviously increased, and a large amount of fine nano-scale magnesia-chrome spinel and ferrochrome spinel crystal grains are used as heterogeneous nuclei to induce and separate out a large amount of fine diopside crystals in the crystallization heat treatment process, so that the compressive strength of the glass ceramic is greatly improved, and the high-value utilization of the stainless steel slag is realized. Therefore, the microcrystalline ceramic prepared by using the stainless steel slag can solve the difficult problems of harmless and high-value utilization of the large amount of the stainless steel slag by adjusting the addition amount of FeO.
The technical scheme of the invention is as follows:
a method for harmless and high-value utilization of large amount of FeO reinforced stainless steel slag comprises the following steps:
(1) crushing the raw materials, drying and screening;
(2) placing the raw materials screened in the step (1) into a ball mill for ball milling and mixing uniformly, wherein the content of FeO in the mixed raw materials is 1-8 wt%;
(3) putting the mixed raw materials subjected to ball milling in the step (2) into an alumina crucible, placing the alumina crucible into a tube furnace, heating to 1450-1650 ℃, preserving heat for 0.5-1.5 h to obtain a molten glass solution, and simultaneously placing a stainless steel mold into a muffle furnace to heat to 550 ℃;
(4) taking out the stainless steel mold from the muffle furnace, pouring the molten glass solution obtained in the step (3) into the stainless steel mold, putting the stainless steel mold into the muffle furnace again, keeping the temperature at 550 ℃ for annealing for 0.5-1.5 h, and cooling along with the furnace to obtain base glass;
(5) respectively carrying out nucleation heat treatment and crystallization heat treatment on the base glass obtained in the step (4) in an isothermal gradient furnace, obtaining nucleation glass after the nucleation heat treatment, and finally obtaining microcrystalline ceramics after the crystallization heat treatment on the nucleation glass;
the raw materials in the step (1) comprise 50-70 wt% of stainless steel slag, 10-30 wt% of fly ash, 5-15 wt% of quartz sand, 5-8 wt% of light magnesium oxide, 0-6 wt% of industrial ferrous oxide and 0-3 wt% of soda ash.
And (3) heating the tubular furnace from room temperature to 1000 ℃ at a heating rate of 10 ℃/min, then from 1000 ℃ to 1300 ℃ at a heating rate of 7 ℃/min, and then from 1300 ℃ to 1450-1650 ℃ at a heating rate of 5 ℃/min.
In the step (5), the nucleation heat treatment system of the base glass is to preserve heat for 1.5-2.5 h at 650-750 ℃, and the crystallization heat treatment system of the nucleation glass is to preserve heat for 2-3 h at 800-900 ℃.
The FeO content in the mixed raw material of the step (2) is preferably 4.8 wt%.
The raw material in step (1) was dried at 100 ℃ for 24 hours and sieved through a 200 mesh sieve.
The ball milling time in the step (2) is 3 hours.
The invention has the beneficial effects that:
(1) the method has good harmless treatment effect on the stainless steel slag, promotes heavy metal element Cr in the stainless steel slag to exist in chromium spinel crystal lattices in the nucleation stage of the microcrystalline ceramic by adjusting the content of FeO, and enables the spinel to be wrapped and fused by diopside crystals after crystallization, so that the solidification degree of the Cr is further improved. When the FeO content was 4.8 wt%, 95.23 wt% of Cr in the stainless steel slag was present in the diopside crystals of the microcrystalline ceramic, and the Cr leaching concentration was only 0.009 mg/L.
(2) The invention has large treatment capacity on the stainless steel slag, the utilization rate of the stainless steel slag reaches more than 60 wt%, the use amount of the stainless steel slag is greatly increased (by 40%), and the harmless effect of the bulk quantity of the invention is far better than that of the prior art.
(3) According to the invention, the strengthened stainless steel slag is harmless in large quantity, and the obtained product microcrystalline ceramic has good chemical stability and mechanical property, so that high-value utilization of the stainless steel slag solid waste is realized. Acid resistance of the glass ceramics (20 wt% H) when the FeO content is 4.8 wt% 2 SO 4 ) 99.95 percent, 99.91 percent of alkalinity resistance (20 percent by weight of NaOH), 0.03 percent of water absorption, 255MPa of compressive strength and 949.3HV of Vickers hardness, which are far higher than the prior art.
Drawings
FIG. 1 is a SEM image (a) and XRD pattern (b) of a nucleated glass of the present invention;
FIG. 2 shows SEM image (a) and XRD pattern (b) of crystallized glass (microcrystalline ceramic) according to the present invention;
FIG. 3 shows the results of testing the compressive strength and Vickers hardness of microcrystalline ceramics of examples F1-F5 according to the present invention.
Detailed Description
According to the invention, the stainless steel slag is used for preparing the microcrystalline ceramic, more Cr in the slag is migrated and exists in diopside crystals in the microcrystalline ceramic by adjusting the addition amount of FeO, so that the effects of strengthening and fixing chromium and reducing the leaching amount of Cr are achieved, and meanwhile, the high-strength microcrystalline ceramic is obtained, so that technical support is provided for realizing large-scale harmless and high-value utilization of the stainless steel slag.
The following 5 examples were selected from the last 100 experiments.
Example 1(F1)
60 wt% of stainless steel slag, 22 wt% of fly ash, 11 wt% of quartz sand, 1 wt% of industrial ferrous oxide, 4 wt% of light magnesium oxide and 2 wt% of soda ash are crushed and dried at 100 ℃ for 24 hours, and then screened through a 200-mesh sieve. Ball milling for 3 hr to mix the material homogeneously. The mixture contains 26.1 wt% of CaO, 10.8 wt% of MgO and Al by analysis 2 O 3 10.4wt％、SiO 2 46.4wt％、Cr 2 O 3 1.3wt％、FeO1.8wt％、TiO 2 1.4wt％、Na 2 O 1.7wt％、K 2 O 0.1wt％；
The mixture obtained is placed in a 200ml alumina crucible and heated in a tube furnace from room temperature to 1000 ℃ at a heating rate of 10 ℃/min, from 1000 ℃ to 1300 ℃ at a heating rate of 7 ℃/min, from 1300 ℃ to 1550 ℃ at a heating rate of 5 ℃/min and held at 1550 ℃ for 1 h. Simultaneously, placing the stainless steel mold into a muffle furnace to be heated to 550 ℃;
and pouring the molten glass into a mold for annealing, keeping the temperature for 1h, and cooling along with the furnace to obtain the base glass. And carrying out nucleation heat treatment on the obtained base glass in an isothermal gradient furnace under the condition of keeping the temperature of 710 ℃ for 2h to obtain the nucleated glass. Carrying out crystallization heat treatment on the obtained nucleated glass in an isothermal gradient furnace under the condition of keeping the temperature at 880 ℃ for 2.5h to prepare microcrystalline ceramic;
carrying out XPS detection on Cr element of the prepared microcrystalline glass, taking XPS electron binding energy spectrums of chromium ions in the chromium spinel and the base glass as reference, fitting peak separation on the detection result to obtain the microcrystalline glass, wherein 90.92 wt% of Cr is presentIn the diopside crystal lattice. The results of Cr leaching test and chemical stability test on the microcrystalline ceramic are shown in Table 1, the Cr leaching concentration of the microcrystalline ceramic is 0.026mg/L, and the acid resistance (20 wt% H) 2 SO 4 ) 99.75%, the alkali resistance (20 wt% NaOH) 99.62%, and the water absorption 0.07%. The mechanical property test of the microcrystalline ceramic shows that the compressive strength of the microcrystalline ceramic is 223.7MPa and the Vickers hardness is 876.4HV as shown in figure 3.
Example 2(F2)
60 wt% of stainless steel slag, 22 wt% of fly ash, 10 wt% of quartz sand, 2 wt% of industrial ferrous oxide, 4 wt% of light magnesium oxide and 2 wt% of soda ash are crushed and dried at 100 ℃ for 24 hours, and then screened through a 200-mesh sieve. Ball milling for 3 hr to mix the material homogeneously. The mixture contains 25.8 wt% of CaO, 10.7 wt% of MgO and Al by analysis 2 O 3 10.3wt％、SiO 2 45.9wt％、Cr 2 O 3 1.3wt％、FeO2.8wt％、TiO 2 1.4wt％、Na 2 O 1.7wt％、K 2 O 0.1wt％；
The mixture obtained is placed in a 200ml alumina crucible and heated in a tube furnace from room temperature to 1000 ℃ at a heating rate of 10 ℃/min, from 1000 ℃ to 1300 ℃ at a heating rate of 7 ℃/min, from 1300 ℃ to 1550 ℃ at a heating rate of 5 ℃/min and held at 1550 ℃ for 1 h. Simultaneously, placing the stainless steel mold into a muffle furnace to be heated to 550 ℃;
and pouring the melted glass solution into a mold for annealing, preserving heat for 1 hour, and then cooling along with the furnace to obtain the base glass. And carrying out nucleation heat treatment on the obtained base glass in an isothermal gradient furnace under the condition of keeping the temperature of 710 ℃ for 2h to obtain the nucleated glass. Carrying out crystallization heat treatment on the obtained nucleated glass in an isothermal gradient furnace under the condition of keeping the temperature at 880 ℃ for 2.5h to prepare microcrystalline ceramic;
the prepared microcrystalline glass is subjected to Cr element XPS detection, XPS electron binding energy spectrums of chromium ions in the chromium spinel and the base glass are taken as references, and the detection result is subjected to peak fitting so as to obtain 91.73 wt% of Cr existing in crystal lattices of the diopside crystal. The results of Cr leaching test and chemical stability test on the microcrystalline ceramics are shown in Table 1, and the Cr leaching concentration of the microcrystalline ceramics is shown in Table 1The degree of the acid resistance is 0.022mg/L and the acid resistance is 20 wt% H 2 SO 4 ) 99.84 percent, the alkalinity resistance (20 percent by weight of NaOH) 99.74 percent and the water absorption rate 0.04 percent. The mechanical property test of the microcrystalline ceramic shows that the compressive strength of the microcrystalline ceramic is 231.9MPa and the Vickers hardness is 903.7HV as shown in figure 3.
Example 3(F3)
60 wt% of stainless steel slag, 21 wt% of fly ash, 10 wt% of quartz sand, 3 wt% of industrial ferrous oxide, 4 wt% of light magnesium oxide and 2 wt% of soda ash are crushed and dried at 100 ℃ for 24 hours, and then screened through a 200-mesh sieve. Ball milling for 3 hr to mix the material homogeneously. The mixture contains 25.5 wt% of CaO, 10.5 wt% of MgO and Al by analysis 2 O 3 10.2wt％、SiO 2 45.5wt％、Cr 2 O 3 1.3wt％、FeO3.8wt％、TiO 2 1.4wt％、Na 2 O 1.6wt％、K 2 O 0.1wt％；
The mixture obtained is placed in a 200ml alumina crucible and heated in a tube furnace from room temperature to 1000 ℃ at a heating rate of 10 ℃/min, from 1000 ℃ to 1300 ℃ at a heating rate of 7 ℃/min, from 1300 ℃ to 1550 ℃ at a heating rate of 5 ℃/min and held at 1550 ℃ for 1 h. Simultaneously, placing the stainless steel mold into a muffle furnace to be heated to 550 ℃;
and pouring the melted glass solution into a mold for annealing, preserving heat for 1 hour, and then cooling along with the furnace to obtain the base glass. And carrying out nucleation heat treatment on the obtained base glass in an isothermal gradient furnace under the condition of keeping the temperature of 710 ℃ for 2h to obtain the nucleated glass. Carrying out crystallization heat treatment on the obtained nucleated glass in an isothermal gradient furnace under the condition of keeping the temperature at 880 ℃ for 2.5h to prepare microcrystalline ceramic;
the prepared microcrystalline ceramic is subjected to Cr element XPS detection, XPS electron binding energy spectrums of chromium ions in chromium spinel and base glass are taken as references, and the detection result is subjected to peak fitting so as to obtain the microcrystalline ceramic, wherein 93.32 wt% of Cr is added in crystal lattices of diopside crystals. The results of Cr leaching test and chemical stability test on the microcrystalline ceramics are shown in Table 1, the microcrystalline ceramics has a Cr leaching concentration of 0.014mg/L and acid resistance (20 wt% H) 2 SO 4 ) 99.89%, the alkali resistance (20 wt% NaOH) 99.84%, and the water absorption 0.05 percent. The mechanical property test of the microcrystalline ceramic shows that the compressive strength of the microcrystalline ceramic is 238.2MPa and the Vickers hardness is 928.1HV as shown in figure 3.
Example 4(F4)
Raw materials of 60 wt% of stainless steel slag, 20 wt% of fly ash, 10 wt% of quartz sand, 4 wt% of industrial ferrous oxide, 4 wt% of light magnesium oxide and 2 wt% of soda ash are crushed, dried at 100 ℃ for 24 hours and sieved by a 200-mesh sieve; ball milling for 3h by using a ball mill to uniformly mix the raw materials; the mixed raw material was analyzed to contain 25.3 wt% of CaO, 10.4 wt% of MgO, and Al 2 O 3 10.1wt％、SiO 2 45wt％、Cr 2 O 3 1.3wt％、FeO4.8wt％、TiO 2 1.4wt％、Na 2 O 1.6wt％、K 2 O 0.1wt％；
Putting the obtained mixed raw materials into a 200ml alumina crucible, placing the alumina crucible in a tubular furnace, heating the alumina crucible to 1000 ℃ from room temperature at a heating rate of 10 ℃/min, heating the alumina crucible to 1300 ℃ from 1000 ℃ at a heating rate of 7 ℃/min, heating the alumina crucible to 1550 ℃ from 1300 ℃ at a heating rate of 5 ℃/min, and preserving heat for 1h at 1550 ℃ to obtain molten glass; simultaneously, placing the stainless steel mold into a muffle furnace to be heated to 550 ℃;
pouring the melted glass into a stainless steel mold for annealing, preserving heat at 550 ℃ for 1h, and then cooling with a furnace to obtain base glass; carrying out nucleation heat treatment on the obtained basic glass in an isothermal gradient furnace under the condition of keeping the temperature of 710 ℃ for 2 hours to prepare nucleated glass; carrying out crystallization heat treatment on the obtained nucleated glass in an isothermal gradient furnace under the condition of keeping the temperature at 880 ℃ for 2.5h to prepare microcrystalline ceramic;
carrying out XPS detection on Cr element of the prepared microcrystalline ceramic, taking XPS electronic binding energy spectrums of chromium ions in chromium spinel and base glass as reference, and fitting and splitting peaks on detection results to obtain 95.23 wt% of Cr in diopside crystal lattices; the results of Cr leaching test and chemical stability test on the microcrystalline ceramics are shown in Table 1, the Cr leaching concentration of the microcrystalline ceramics is 0.009mg/L, and the acid resistance is 20 wt% H 2 SO 4 ) 99.95 percent, the alkalinity resistance (20wt percent NaOH) is 99.91 percent, and the water absorption is 0.03 percent; the microcrystalline ceramics are subjected to mechanical property test, the result is shown in figure 3, and the microcrystalline ceramics areThe compressive strength of the ceramic is 255MPa, and the Vickers hardness is 949.3 HV.
Example 5(F5)
60 wt% of stainless steel slag, 19 wt% of fly ash, 10 wt% of quartz sand, 5 wt% of industrial ferrous oxide, 4 wt% of light magnesium oxide and 2 wt% of soda ash are crushed and dried at 100 ℃ for 24 hours, and then screened through a 200-mesh sieve. Ball milling for 3 hr to mix the material homogeneously. The mixture contains 25 wt% of CaO, 10.3 wt% of MgO and Al by analysis 2 O 3 10wt％、SiO 2 44.5wt％、Cr 2 O 3 1.3wt％、FeO5.8wt％、TiO 2 1.4wt％、Na 2 O 1.6wt％、K 2 O 0.1wt％；
The mixture obtained is placed in a 200ml alumina crucible and heated in a tube furnace from room temperature to 1000 ℃ at a heating rate of 10 ℃/min, from 1000 ℃ to 1300 ℃ at a heating rate of 7 ℃/min, from 1300 ℃ to 1550 ℃ at a heating rate of 5 ℃/min and held at 1550 ℃ for 1 h. Simultaneously, placing the stainless steel mold into a muffle furnace to be heated to 550 ℃;
and pouring the molten glass into a mold for annealing, keeping the temperature for 1h, and cooling along with the furnace to obtain the base glass. And carrying out nucleation heat treatment on the obtained base glass in an isothermal gradient furnace under the condition of keeping the temperature of 710 ℃ for 2h to obtain the nucleated glass. Carrying out crystallization heat treatment on the obtained nucleated glass in an isothermal gradient furnace under the condition of keeping the temperature at 880 ℃ for 2.5h to prepare microcrystalline ceramic;
the prepared microcrystalline ceramic is subjected to Cr element XPS detection, XPS electron binding energy spectrums of chromium ions in chromium spinel and base glass are taken as references, and peaks are fitted to detection results to obtain the microcrystalline ceramic, wherein 93.96 wt% of Cr is added in crystal lattices of diopside crystals. The results of Cr leaching test and chemical stability test on the microcrystalline ceramics are shown in Table 1, the microcrystalline ceramics has a Cr leaching concentration of 0.014mg/L and acid resistance (20 wt% H) 2 SO 4 ) 99.9%, the alkali resistance (20 wt% NaOH) 99.89%, and the water absorption 0.06%. The mechanical property test of the microcrystalline ceramic shows that the compressive strength of the microcrystalline ceramic is 244.3MPa and the Vickers hardness is 936.5HV as shown in figure 3.
TABLE 1 Cr leaching, acid and alkali resistance and water absorption detection of the microcrystalline ceramic prepared by the invention
The mechanical properties of the microcrystalline ceramic prepared by the present invention were compared with those of microcrystalline glass prepared by eudipleura and the like, and the results are shown in table 2.
TABLE 2 comparison of mechanical properties of the microcrystalline ceramic prepared by the present invention and the microcrystalline glass prepared by Ouyanghun et al
| Examples | Strength (MPa) | Vickers Hardness (HV) |
| 1 | 223.7 | 876.4 |
| 2 | 231.9 | 903.7 |
| 3 | 238.2 | 928.1 |
| 4 | 255 | 949.3 |
| 5 | 244.3 | 936.5 |
| Europe and Yang are smoothly | 222.9 | 729.27 |
。
Claims (6)
1. A method for harmless and high-value utilization of large amount of FeO reinforced stainless steel slag is characterized by comprising the following steps:
(1) crushing the raw materials, drying and screening;
(2) placing the raw materials screened in the step (1) into a ball mill for ball milling and uniformly mixing, wherein the content of FeO in the mixed raw materials is 1-8 wt%;
(3) putting the mixed raw materials subjected to ball milling in the step (2) into an alumina crucible, placing the alumina crucible into a tube furnace, heating to 1450-1650 ℃, preserving heat for 0.5-1.5 h to obtain a molten glass solution, and simultaneously placing a stainless steel mold into a muffle furnace to heat to 550 ℃;
(4) taking out the stainless steel mold from the muffle furnace, pouring the molten glass solution obtained in the step (3) into the stainless steel mold, putting the stainless steel mold into the muffle furnace again, keeping the temperature at 550 ℃ for annealing for 0.5-1.5 h, and cooling along with the furnace to obtain base glass;
(5) respectively carrying out nucleation heat treatment and crystallization heat treatment on the base glass obtained in the step (4) in an isothermal gradient furnace, obtaining nucleation glass after the nucleation heat treatment, and finally obtaining microcrystalline ceramics after the crystallization heat treatment on the nucleation glass;
the raw materials in the step (1) comprise 50-70 wt% of stainless steel slag, 10-30 wt% of fly ash, 5-15 wt% of quartz sand, 5-8 wt% of light magnesium oxide, 0-6 wt% of industrial ferrous oxide and 0-3 wt% of soda ash.
2. The method of claim 1, wherein the FeO-reinforced stainless steel slag is used for harmless and high-value utilization in large quantities, and is characterized in that: and (3) heating the tubular furnace from room temperature to 1000 ℃ at a heating rate of 10 ℃/min, then from 1000 ℃ to 1300 ℃ at a heating rate of 7 ℃/min, and then from 1300 ℃ to 1450-1650 ℃ at a heating rate of 5 ℃/min.
3. The method of claim 1, wherein the FeO-reinforced stainless steel slag is used for harmless and high-value utilization in large quantities, and is characterized in that: the nucleation heat treatment system of the base glass in the step (5) is to keep the temperature at 650-750 ℃ for 1.5-2.5 h, and the crystallization heat treatment system of the nucleation glass is to keep the temperature at 800-900 ℃ for 2-3 h.
4. The method of claim 1, wherein the FeO-reinforced stainless steel slag is used for harmless and high-value utilization in large quantities, and is characterized in that: the FeO content in the mixed raw material of the step (2) is preferably 4.8 wt%.
5. The method of claim 1, wherein the FeO-reinforced stainless steel slag is used for harmless and high-value utilization in large quantities, and is characterized in that: the raw material in step (1) was dried at 100 ℃ for 24 hours and sieved through a 200 mesh sieve.
6. The method of claim 1, wherein the FeO-reinforced stainless steel slag is used for harmless and high-value utilization in large quantities, and is characterized in that: the ball milling time in the step (2) is 3 hours.
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|---|---|---|---|---|
| CN104445944A (en) * | 2014-12-16 | 2015-03-25 | 北京科技大学 | Method for preparing microcrystalline glass from hazardous solid wastes |
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| CN107417123A (en) * | 2017-07-28 | 2017-12-01 | 苏州大学 | A kind of method for preparing devitrified glass using stainless steel slag and fluorite mine tailing |
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| CN104445944A (en) * | 2014-12-16 | 2015-03-25 | 北京科技大学 | Method for preparing microcrystalline glass from hazardous solid wastes |
| CN106082679A (en) * | 2016-06-15 | 2016-11-09 | 北京科技大学 | A kind of method that full waste material short route prepares devitrified glass |
| CN107417123A (en) * | 2017-07-28 | 2017-12-01 | 苏州大学 | A kind of method for preparing devitrified glass using stainless steel slag and fluorite mine tailing |
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