CN117887972A - Method for recovering valuable resources by co-processing magnesium slag and aluminum ash - Google Patents
Method for recovering valuable resources by co-processing magnesium slag and aluminum ash Download PDFInfo
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- CN117887972A CN117887972A CN202410067932.1A CN202410067932A CN117887972A CN 117887972 A CN117887972 A CN 117887972A CN 202410067932 A CN202410067932 A CN 202410067932A CN 117887972 A CN117887972 A CN 117887972A
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- aluminum ash
- slag
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- 239000002893 slag Substances 0.000 title claims abstract description 113
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000011777 magnesium Substances 0.000 title claims abstract description 101
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 101
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 77
- 238000012545 processing Methods 0.000 title claims abstract description 19
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 52
- 239000000956 alloy Substances 0.000 claims abstract description 52
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 48
- 238000003723 Smelting Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003513 alkali Substances 0.000 claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims description 28
- 239000012670 alkaline solution Substances 0.000 claims description 26
- 239000000292 calcium oxide Substances 0.000 claims description 25
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 25
- 238000004090 dissolution Methods 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 22
- 239000000654 additive Substances 0.000 claims description 20
- 239000011734 sodium Substances 0.000 claims description 20
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 19
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 19
- 229910052708 sodium Inorganic materials 0.000 claims description 19
- 230000000996 additive effect Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
- 238000002386 leaching Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 14
- 239000003518 caustics Substances 0.000 claims description 11
- 235000019738 Limestone Nutrition 0.000 claims description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- 239000006028 limestone Substances 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 22
- 239000002994 raw material Substances 0.000 abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000011978 dissolution method Methods 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 30
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 20
- 239000000047 product Substances 0.000 description 18
- 229910052742 iron Inorganic materials 0.000 description 15
- 239000010703 silicon Substances 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000012071 phase Substances 0.000 description 13
- 239000011575 calcium Substances 0.000 description 12
- 238000002156 mixing Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 229910052791 calcium Inorganic materials 0.000 description 10
- 239000010439 graphite Substances 0.000 description 10
- 229910002804 graphite Inorganic materials 0.000 description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 9
- 238000001816 cooling Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 8
- 230000009467 reduction Effects 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000004568 cement Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 6
- 229910052593 corundum Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 description 6
- 229910020068 MgAl Inorganic materials 0.000 description 5
- 229910052681 coesite Inorganic materials 0.000 description 5
- 229910052906 cristobalite Inorganic materials 0.000 description 5
- -1 hepta-aluminum-dodecacalcium Chemical compound 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 229910052682 stishovite Inorganic materials 0.000 description 5
- 229910052905 tridymite Inorganic materials 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 229910000905 alloy phase Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 150000003841 chloride salts Chemical class 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229910017976 MgO 4 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229910000882 Ca alloy Inorganic materials 0.000 description 1
- 229910014460 Ca-Fe Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910005347 FeSi Inorganic materials 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229910018619 Si-Fe Inorganic materials 0.000 description 1
- 229910008289 Si—Fe Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000011278 co-treatment Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011404 masonry cement Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a method for recovering valuable resources by co-processing magnesium slag and aluminum ash, which belongs to the technical field of industrial solid waste utilization. The obtained ferrosilicon alloy can be used as a magnesium smelting reducing agent to return to a magnesium smelting process by a silicothermic method, and calcium aluminate can be used as premelting slag in the steel industry or used as a raw material for extracting aluminum oxide by a carbon alkali dissolution method. In addition, the whole process basically does not produce secondary pollution such as waste gas, waste water, waste slag and the like, and simultaneously realizes the recycling utilization of elements such as Si, fe, al, ca and the like.
Description
Technical Field
The invention belongs to the technical field of industrial solid waste utilization, and particularly relates to a method for recovering valuable resources by co-processing magnesium slag and aluminum ash.
Background
Magnesium and aluminum are typical light metal materials, and have very important application in the national defense and civil fields. The smelting technology of the original magnesium and the original aluminum in China is the world first, and the method has strong competitiveness internationally. However, a large amount of solid waste and hazardous waste can be discharged each year, and because of no good industrialized treatment technology, a large amount of solid hazardous waste is in a stockpiled state for a long time, and serious harm is brought to the ecological environment, so that the method has become a bottleneck for restricting the green sustainable development of the industry.
The magnesium slag is a solid waste discharged in the production process of magnesium smelting by the Pidgeon process, and the annual discharge amount in China is about 650 ten thousand tons. The main components of the magnesium slag are dicalcium silicate (2CaO.SiO 2), ferric oxide (Fe 2O3), magnesium oxide (MgO) and fluorite (CaF 2). At present, magnesium slag is mainly used as a cement admixture or used for manufacturing building bricks, but the produced building materials have the problems of serious volume stability, easy cracking of materials and the like due to higher content of free magnesium oxide and calcium oxide in the magnesium slag, the utilization rate is less than 10 percent, and a large amount of magnesium slag is still mainly piled up. In addition, the prior disposal technology does not effectively recycle valuable metal resources such as Si, fe, ca and the like in the magnesium slag.
Meanwhile, about 500 ten thousand tons of aluminum ash are produced in the processes of original aluminum casting, aluminum product processing and aluminum alloy regeneration in China every year, a large amount of aluminum ash is produced after aluminum extraction, and the aluminum ash is determined as dangerous waste in 2016 years. The main components of the aluminum ash are metallic aluminum (Al), aluminum oxide (Al 2O3), aluminum nitride (AlN), a small amount of chloride salt and the like, and the aluminum ash is also available valuable resource. At present, domestic aluminum ash is mainly used for preparing products such as aluminum electrolysis anode steel claw protection rings or covering materials, preparing regenerated alumina raw materials, preparing calcium aluminate refining agents/refractory materials/accelerating agents and the like, and the industrialization is partially realized, but the problems of stagnation, insufficient competitiveness of similar products and the like exist in the products.
Both the magnesium slag and the aluminum ash have the dual properties of resources and harm, however, in the existing magnesium slag and aluminum ash treatment technology, the harm to the ecological environment is partially reduced, but the valuable resources in the magnesium slag and the aluminum ash can not be effectively recovered. For magnesium slag, the existing main engineering utilization mode is as follows: the mixture is used as an admixture for secondary calcination of cement clinker; or as a cement admixture with gypsum, lime, etc. for the production of low-grade masonry cement. Both Chinese patent CN101492260A and Chinese patent CN115532357A disclose methods for producing Portland cement by using magnesium slag, but the magnesium slag is low in doping amount and only 20-30%, and the magnesium slag is very limited in reduction and resource utilization. Chinese patent CN108342585B discloses a comprehensive utilization method of magnesium smelting reducing slag, wherein magnesium slag, silica powder, carbonaceous reducing agent and binder mixture pellets are smelted in an electric arc furnace to produce a ferrosilicon-calcium alloy; or placing the ferrosilicon alloy into a vacuum tank for distillation, and separating the metal calcium and the ferrosilicon alloy. Both the Si-Ca-Fe alloy and the separated Si-Fe alloy can be used as a reducing agent to return to the Pidgeon magnesium smelting process. The technology partially realizes the resource utilization of Si, fe and other elements in magnesium slag, but has the problems of high energy consumption, carbon emission amplification and the like of process equipment, and no report of subsequent industrial application exists.
For aluminum ash disposal, the method is mainly used for preparing products such as aluminum electrolysis anode steel claw protection rings or covering materials, preparing regenerated alumina raw materials, preparing calcium aluminate refining agents/refractory materials/accelerating agents and the like, and part of the technology realizes industrialization. Chinese patent CN104131314B discloses a method for preparing anode steel claw protecting ring by using aluminum ash as raw material, pulping, mixing ash, shaping, removing ammonia and shaping, cooling with alumina, paper pulp and water. Chinese patent CN108239704a discloses a method for producing alumina by recycling secondary aluminum ash, which comprises mixing and wet-milling aluminum ash and sodium oxide, diluting with water, dissolving the diluted slurry in a reaction kettle under high pressure, separating solid from liquid to obtain aluminum-containing solution, and finally obtaining alumina by seed precipitation and drying. Because the alumina in the aluminum ash is alpha-alumina, the problems of low dissolution rate and more impurities exist. Chinese patent CN115947611B discloses a method for preparing refractory material by one-step sintering of secondary aluminum ash, but the fluctuation of the components of aluminum ash is large, and impurity components remain in the product to affect the quality and performance of refractory material. These techniques have problems of long process, need to add various auxiliary raw materials, secondary pollution of waste gas/waste water/waste residue, etc.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for recovering valuable resources by the synergistic treatment of magnesium slag and aluminum ash by combining the component composition characteristics, reactivity and complementarity of the magnesium slag and the aluminum ash.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for recovering valuable resources by co-processing magnesium slag and aluminum ash comprises the following steps:
adding a calcareous additive into a mixture of aluminum ash and magnesium slag, and smelting to produce ferrosilicon alloy and calcium aluminate in the smelting process, wherein the calcium aluminate is directly used as premelting slag for steelmaking or used for preparing sodium metaaluminate and calcium carbonate.
The invention provides a method for recovering valuable resources by co-processing magnesium slag and aluminum ash. Based on analysis of typical phase components in magnesium slag and aluminum ash, the invention uses magnesium slag and aluminum ash as raw materials, and utilizes the reducibility of metallic aluminum and aluminum nitride in the aluminum ash to reduce oxides such as silicon, iron and the like under high temperature conditions to produce ferrosilicon alloy (silicon content is more than or equal to 75wt%) and calcium aluminate products. The obtained ferrosilicon alloy can be used as a magnesium smelting reducing agent to return to a magnesium smelting process by a silicothermic method, and calcium aluminate can be used as premelting slag in the steel industry or used as a raw material for extracting aluminum oxide by a carbon alkali dissolution method. In addition, the whole process basically does not produce secondary pollution such as waste gas, waste water, waste slag and the like, and simultaneously realizes the recycling utilization of elements such as Si, fe, al, ca and the like.
Further, the mass of the aluminum ash is 0.7-1.0 times of the mass of the magnesium slag, and the mass ratio is defined to ensure that the reducing agent in the aluminum ash is used for sufficiently reducing Si and Fe oxides in the magnesium slag. Further, the mass of the calcareous additive is 0 to 0.5 times of the mass of the magnesium slag in terms of the mass of the calcareous oxide, and the mass of the calcareous additive is not 0.
Further, the calcium additive is calcium oxide or limestone, and the calcium additive can ensure that a hepta-aluminum-dodecacalcium product is generated so as to realize recovery of alumina resources in a subsequent link. Further, the smelting temperature is 1400-1600 ℃, preferably 1500 ℃, and the heat preservation time is 1-4 h, preferably 2h. The Si and Fe oxides can be reduced to a higher degree at the temperature, and ferrosilicon and slag generated at the temperature are both liquid phases, so that the ferrosilicon and slag can be effectively separated, and the reduction rate and the separation effect between metal and slag can be improved by prolonging the reaction time.
Further, the method for preparing sodium metaaluminate and calcium carbonate from the calcium aluminate comprises the following steps: and (3) dissolving out the calcium aluminate by adopting an alkaline solution, and carrying out solid-liquid separation after the dissolution is finished, wherein the obtained solution is sodium metaaluminate solution, and the obtained leaching slag mainly comprises calcium carbonate (CaCO 3).
Further, the alkaline solution contains carbon alkali and caustic alkali, wherein the carbon alkali is Na 2CO3, and the caustic alkali is NaOH.
Further, the carbon alkali concentration in the alkaline solution is 20-160 g/L, preferably 80g/L; the caustic concentration is 0 to 20g/L, preferably 5g/L, and the concentration is not 0.
Further, the feed liquid ratio of the calcium aluminate to the alkaline solution is 1g (5-10) mL.
Further, the temperature of the dissolution is 30 to 90 ℃, preferably 90 ℃, and the time is 0.5 to 3 hours, preferably 0.5 hours.
Further, the magnesium slag has a composition range of ：CaO 50～65wt％,SiO2 25～35wt％,MgO 4～10wt％,Fe2O32～5wt％,Al2O3 0.5～2.5wt％; and the aluminum ash has a composition range of ：Al 10～30wt％,AlN 10-30wt％,Al2O330～70wt％,CaO 0.2～0.8wt％,SiO2 2.5～3.5wt％,MgO 0.5～1.5wt％,Fe2O3 1～3wt％,, and a small amount of chloride salts (such as potassium chloride and sodium chloride) are also contained in the aluminum ash.
Further, the chloride in the raw materials is physically volatilized under the high temperature condition of smelting, and is recovered after being cooled by a cooling device to be used as a refining agent for purifying aluminum and magnesium.
Further, the method for recovering valuable resources by the synergistic treatment of the magnesium slag and the aluminum ash specifically comprises the following steps:
Step 1: aluminum ash and magnesium slag discharged in industrial production are used as raw materials, and industrial raw material calcium additives are added. Uniformly mixing aluminum ash, magnesium slag and a calcareous additive, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 0.7 to 1.0 times of the mass of the magnesium slag; the dosage of the calcareous additive is 0 to 0.5 times of the mass of the magnesium slag based on the mass of the calcium oxide;
Step 2: placing the graphite crucible into an electric heating furnace, smelting (smelting reduction) at 1400-1600 ℃, and preserving heat for 1-4 h. Ferrosilicon alloy and calcium aluminate are generated in the smelting process, wherein the liquid ferrosilicon alloy formed in the smelting process gradually gathers and deposits at the bottom of the graphite crucible to form alloy blocks;
Step 3: the slag is pulverized and separated from alloy blocks in the natural cooling process to obtain ferrosilicon alloy and a material taking calcium aluminate as a main component, the obtained ferrosilicon alloy can be used as a magnesium smelting reducing agent to return to a magnesium smelting process by a silicothermic process, and the obtained calcium aluminate can be directly used as premelting slag for steelmaking or used as a raw material for extracting alumina by a carbon alkali dissolution method to carry out step 4;
Step 4: crushing calcium aluminate, and dissolving out the calcium aluminate by adopting an alkaline solution, wherein the feed liquid ratio of the calcium aluminate to the alkaline solution is 1g (5-10) mL, the dissolution temperature is 30-90 ℃ and the time is 0.5-3 h, in the alkaline solution, the carbon alkali concentration is 20-160 g/L, the caustic alkali concentration is 0-20 g/L, after dissolution, the solid-liquid separation is carried out to obtain sodium metaaluminate solution and leaching slag (the main component is CaCO 3), the sodium metaaluminate solution is used for preparing alumina, and the leaching slag is used as a cement raw material.
The reaction process of the invention has the principle that:
The invention utilizes the reducibility of aluminum metal and aluminum nitride in aluminum ash, reduces silicon dioxide in magnesium slag into simple substance silicon and iron by ferric oxide at high temperature, and forms ferrosilicon alloy; in addition, aluminum oxide contained in the aluminum ash raw material is combined with calcium oxide in magnesium slag to form calcium aluminate (mainly heptaaluminum dodecacalcium) after aluminum oxide generated by reducing aluminum oxide and aluminum nitride. The reaction of calcium aluminate and carbon alkali solution to produce sodium metaaluminate solution and calcium carbonate precipitate realizes the recycling of alumina resource, and the reaction equation of the specific process is as follows:
SiO2+2/3Al＝Si+1/3Al2O3
Fe2O3+2Al＝2Fe+Al2O3
Fe2O3+2AlN＝2Fe+Al2O3+N2
Si+Fe＝FeSi(Alloy)
12CaO+7Al2O3＝Ca12Al14O33
Ca12Al14O33+12Na2CO3+33H2O＝14NaAl(OH)4+10NaOH+12CaCO3
compared with the prior art, the invention has the following advantages and technical effects:
(1) According to the method, metal aluminum, aluminum nitride and the like in the aluminum ash are used as reducing agents, oxides of silicon, iron and the like in the magnesium slag and the aluminum ash are reduced, ferrosilicon and calcium aluminate products are produced, the co-treatment of solid hazardous waste in the magnesium aluminum industry is realized, and the utilization rate of the two solid hazardous waste of the magnesium slag and the aluminum ash can be improved.
(2) The method for producing ferrosilicon alloy and calcium aluminate products can be used as a reducing agent to be directly used as a raw material for a Pidgeon magnesium smelting process, calcium aluminate can be directly used as a raw material for producing calcium aluminate cement or used as premelting slag in the steel industry, sodium metaaluminate solution can be produced by a carbon alkali dissolution method, and dissolved slag can be used as a raw material for producing silicate cement. The recycling of valuable metals such as Si, fe, al, ca and the like in magnesium slag and aluminum ash is realized to the maximum extent, and obvious economic benefits can be generated.
(3) The chloride in the aluminum ash is physically volatilized at high temperature, the flue gas is cooled and then is recycled for aluminum and magnesium purification refining agents, and meanwhile, the method does not produce secondary pollution such as waste gas, waste water, waste residue and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a process flow diagram of a method for recovering valuable resources by co-processing magnesium slag and aluminum ash;
Fig. 2 is an X-ray diffraction (XRD) phase analysis chart of the ferrosilicon alloy obtained in example 1 of the present invention.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
In the embodiment of the invention, the raw materials are aluminum ash and magnesium slag discharged in industrial production, wherein the magnesium slag has the following ：CaO50～65wt％,SiO2 25～35wt％,MgO 4～10wt％,Fe2O3 2～5wt％,Al2O3 0.5～2.5wt％; aluminum ash components in the following ：Al 10～30wt％,AlN 10-30wt％,Al2O3 30～70wt％,CaO 0.2～0.8wt％,SiO2 2.5～3.5wt％,MgO 0.5～1.5wt％,Fe2O3 1～3wt％,, and the aluminum ash also contains a small amount of chloride salts (such as potassium chloride and sodium chloride).
The specific method for preparing alumina from sodium metaaluminate solution is common knowledge in the art, and is not the focus of the present invention, and is not described herein.
FIG. 1 is a process flow diagram of a method for recovering valuable resources by co-processing magnesium slag and aluminum ash.
The calcareous additives used in the examples of the present invention are all commercially available.
The technical scheme of the invention is further illustrated by the following examples.
Example 1
Step 1: uniformly mixing powdery aluminum ash, magnesium slag and calcium oxide serving as a calcium additive, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 0.7 times of the mass of the magnesium slag, and the dosage of the calcium oxide is 0.2 times of the mass of the magnesium slag;
Step 2: the crucible is placed in an electric furnace, and is subjected to melting reduction at 1400 ℃ and heat preservation for 1h. Liquid ferrosilicon alloy formed in the smelting process gathers together and is deposited at the bottom of the crucible;
Step 3: the slag is pulverized and separated from alloy blocks in the natural cooling process to obtain ferrosilicon alloy and calcium aluminate, the ferrosilicon alloy can be used as a magnesium smelting reducing agent to return to a magnesium smelting process by a silicon heat method, the calcium aluminate can be directly used as premelting slag for steelmaking or is subjected to step 4, the mass fraction of silicon in the ferrosilicon alloy obtained in the step is 76wt%, the mass fraction of iron is 24wt%, the main phase in the obtained calcium aluminate is heptaaluminum dodecacalcium (12 CaO.7Al 2O3,C12A7), and a small amount of dicalcium silicate (2 CaO.SiO 2,C2 S) is also contained;
Step 4: crushing calcium aluminate, dissolving out the calcium aluminate by adopting an alkaline solution, wherein the feed liquid ratio of the calcium aluminate to the alkaline solution is 1:6, the concentration of carbon alkali (sodium carbonate) in the alkaline solution is 60g/L, the concentration of caustic alkali (sodium hydroxide) is 5g/L, carrying out dissolution reaction at the temperature of 60 ℃ for 0.5h, and carrying out solid-liquid separation after dissolution to obtain sodium metaaluminate solution and leaching slag (CaCO 3 is the main component), wherein the leaching slag is used as a cement raw material. Adding superfine aluminum hydroxide seed crystal with granularity less than 320 meshes and seed crystal adding amount of 10wt% into the sodium aluminate solution obtained after solid-liquid separation, controlling the temperature at 50 ℃ and the time at 8h for seed crystal decomposition, and finally obtaining the superfine aluminum hydroxide product through filtration, washing and drying.
Fig. 2 is an X-ray diffraction (XRD) phase analysis chart of the ferrosilicon alloy obtained in example 1 of the present invention. As can be seen from fig. 2, the obtained ferrosilicon alloy phase accords with the phase characteristics of the high-silicon low-iron alloy, is almost the same as the 75# ferrosilicon alloy phase purchased in the market, and proves the feasibility of the ferrosilicon alloy phase as a magnesium reducing agent for returning to the Pidgeon process for smelting magnesium.
Example 2
Step 1: uniformly mixing powdery aluminum ash, magnesium slag and calcium oxide serving as a calcium additive, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 0.9 times of the mass of the magnesium slag; the dosage of the calcium oxide is 0.3 times of the mass of the magnesium slag;
Step 2: the crucible was placed in an electric furnace, and subjected to melt reduction at 1550℃and heat preservation for 1.5 hours. Liquid ferrosilicon alloy formed in the smelting process gathers together and is deposited at the bottom of the crucible;
Step 3: the slag is pulverized and separated from alloy blocks in the natural cooling process to obtain ferrosilicon alloy and calcium aluminate, wherein the mass fraction of silicon in the obtained ferrosilicon alloy is 85wt%, the mass fraction of iron is 15wt%, and the main phase in the obtained calcium aluminate is dodecacalcium heptaluminate C 12A7 and contains a small amount of MgAl 2O4. The ferrosilicon alloy can be used as a magnesium smelting reducing agent to return to the magnesium smelting process by a silicothermic method, and the calcium aluminate can be directly used as premelting slag for steelmaking.
Example 3
Step 1: uniformly mixing powdery aluminum ash, magnesium slag and calcium oxide serving as a calcium additive, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 0.8 times of the mass of the magnesium slag, and the dosage of the calcium oxide is 0.25 times of the mass of the magnesium slag;
Step 2: the crucible is placed in an electric furnace, melted and reduced at 1500 ℃, and the temperature is kept for 2 hours. Liquid ferrosilicon alloy formed in the smelting process gathers together and is deposited at the bottom of the crucible;
Step 3: the slag is pulverized and separated from an alloy block in the natural cooling process to obtain ferrosilicon alloy and calcium aluminate, wherein the mass fraction of silicon in the obtained ferrosilicon alloy is 82wt%, the mass fraction of iron is 18wt%, the main phase in the obtained calcium aluminate is C 12A7, and a small amount of MgAl 2O4 is also contained; the ferrosilicon alloy can be used as a magnesium smelting reducing agent to return to a magnesium smelting process by a silicothermic method, and calcium aluminate can be directly used as premelting slag for steelmaking or used for carrying out step 4;
Step 4: crushing the calcium aluminate obtained in the step 3, and dissolving out the calcium aluminate by adopting an alkaline solution, wherein in the alkaline solution, the concentration of carbon and alkali is 80g/L, the concentration of caustic alkali is 10g/L, the feed liquid ratio of the calcium aluminate to the alkaline solution is 1:8, the dissolution reaction is carried out at the temperature of 90 ℃ for 2 hours, and the solid-liquid separation is carried out after the dissolution is finished to obtain sodium metaaluminate solution and leaching slag (the main component is CaCO 3).
Example 4
Step 1: uniformly mixing powdery aluminum ash, magnesium slag and calcium oxide serving as a calcium additive, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 0.9 times of the mass of the magnesium slag, and the dosage of the calcium oxide is 0.3 times of the mass of the magnesium slag;
Step 2: the crucible is placed in an electric furnace, and is subjected to melting reduction at 1600 ℃ and heat preservation for 1.5 hours. Liquid ferrosilicon alloy formed in the smelting process gathers together and is deposited at the bottom of the crucible;
Step 3: the slag is pulverized and separated from an alloy block in the natural cooling process to obtain ferrosilicon alloy and calcium aluminate, wherein the mass fraction of silicon in the obtained ferrosilicon alloy is 87wt%, the mass fraction of iron is 13wt%, the main phase in the obtained calcium aluminate is C 12A7, and a small amount of MgAl 2O4 is also contained;
Step 4: crushing the calcium aluminate obtained in the step 3, and dissolving out the calcium aluminate by adopting an alkaline solution, wherein in the alkaline solution, the concentration of carbon and alkali is 90g/L, the concentration of caustic alkali is 20g/L, the feed liquid ratio of the calcium aluminate to the alkaline solution is 1:6, the dissolution reaction is carried out at the temperature of 80 ℃ for 2 hours, and the solid-liquid separation is carried out after the dissolution is finished to obtain sodium metaaluminate solution and leaching slag (the main component is CaCO 3).
Example 5
Step 1: uniformly mixing powdery aluminum ash, magnesium slag and lime additive limestone, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 1.0 time of the mass of the magnesium slag, and the dosage of the limestone is 0.5 time of the mass of the magnesium slag;
Step 2: the crucible is placed in an electric furnace, melted and reduced at 1500 ℃, and kept for 4 hours. Liquid ferrosilicon alloy formed in the smelting process gathers together and is deposited at the bottom of the crucible;
step 3: the slag is pulverized and separated from alloy blocks in the natural cooling process to obtain ferrosilicon alloy and calcium aluminate, wherein the mass fraction of silicon in the obtained ferrosilicon alloy is 92wt%, the mass fraction of iron is 8wt%, and the main phase in the obtained calcium aluminate is C 12A7 and also contains a small amount of CaO;
Step 4: crushing the calcium aluminate obtained in the step 3, and dissolving out the calcium aluminate by adopting an alkaline solution, wherein in the alkaline solution, the concentration of carbon and alkali is 20g/L, the concentration of caustic alkali is 10g/L, the feed liquid ratio of the calcium aluminate to the alkaline solution is 1:5, the dissolution reaction is carried out at the temperature of 30 ℃, the reaction time is 3h, and after the dissolution is finished, the solid-liquid separation is carried out to obtain sodium metaaluminate solution and leaching slag (the main component is CaCO 3).
Example 6
Step 1: uniformly mixing powdery aluminum ash, magnesium slag and lime additive limestone, and pouring the mixture into a graphite crucible; wherein the dosage of the aluminum ash is 0.7 times of the mass of the magnesium slag, and the dosage of the limestone is 0.1 times of the mass of the magnesium slag;
Step 2: the crucible is placed in an electric furnace, and is subjected to melting reduction at 1400 ℃ and heat preservation for 2 hours. Liquid ferrosilicon alloy formed in the smelting process gathers together and is deposited at the bottom of the crucible;
Step 3: the slag is pulverized and separated from an alloy block in the natural cooling process to obtain ferrosilicon alloy and calcium aluminate, wherein the mass fraction of silicon in the obtained ferrosilicon alloy is 78wt%, the mass fraction of iron is 22wt%, the main phase in the obtained calcium aluminate is C 12A7, and the obtained ferrosilicon alloy also contains a small amount of C 2 S, CA and MgAl 2O4;
Step 4: crushing the calcium aluminate obtained in the step 3, and dissolving out the calcium aluminate by adopting an alkaline solution, wherein in the alkaline solution, the concentration of carbon and alkali is 40g/L, the concentration of caustic alkali is 10g/L, the feed liquid ratio of the calcium aluminate to the alkaline solution is 1:10, the dissolution reaction is carried out at the temperature of 50 ℃ for 1h, and the solid-liquid separation is carried out after the dissolution is finished to obtain sodium metaaluminate solution and leaching slag (the main component is CaCO 3).
Comparative example 1
The only difference from example 4 is that the calcareous additive is replaced by an equivalent amount of sodium chloride.
The replacement of calcium oxide with sodium chloride does not give the corresponding material because: 1. sodium chloride is almost completely volatilized at the reaction temperature of the invention; 2. the purpose of the addition of calcium oxide is to combine with the alumina contained in the aluminum ash and produce the product hepta-dodecacalcium, and if the calcium oxide is replaced by other substances, the produced product will be changed, so that the subsequent leaching and extraction of the alumina are difficult. Not only increases the cost of raw materials, but also brings difficulty to the production process.
Comparative example 2
Step 1: uniformly mixing powdery aluminum ash and magnesium slag, pouring the mixture into a graphite crucible, wherein the dosage of the aluminum ash is 0.7 times of the mass of the magnesium slag, placing the crucible into an electric furnace, roasting at 1400 ℃, and preserving heat for 1h to obtain roasted clinker;
Step 2: mixing the baked clinker obtained in the step 1 with water (the liquid-solid ratio is 4 mL/g), adding acetic acid (the volume fraction is 20%), and treating for 3 hours at 85 ℃ to obtain treated slurry;
step 3: sequentially carrying out solid-liquid separation and drying on the treated slurry in the step 2 to obtain filter residues, mixing the filter residues with lime additive limestone, sequentially carrying out ore grinding, forming (forming pressure is 20 MPa), drying and roasting (roasting temperature is 1500 ℃, roasting time is 2 h), wherein the calcium oxide dosage is 0.2 times of the mass of magnesium slag in the step 1, the mass fraction of silicon in the obtained ferrosilicon alloy is 95wt%, the mass fraction of iron is 5wt%, and the main phase in the obtained calcium aluminate material is CA 2, and also contains a small amount of C 2 S and MgAl 2O4.
The calcium aluminate obtained in step 1 of this comparative example (there are various kinds of calcium aluminates, the calcium aluminate obtained in step 1 of this comparative example is not the heptaaluminum dodecacalcium described in the present invention) and the ferrosilicon alloy react with the acid added in step 2, causing the loss of aluminum, calcium oxide and metallic iron in the ferrosilicon alloy into solution, and thus the objective product of the present invention cannot be obtained after the reaction in step 3. This comparative example can realize recovery of silicon element, but cannot realize recovery of aluminum, calcium and iron elements.
Comparative example 3
The difference from example 4 is only that the melting temperature is 1000 ℃.
The comparative example has too low smelting temperature, the reduction reaction cannot be performed, and the target product cannot be obtained.
Because the smelting temperature is too low, siO 2 in the magnesium slag cannot be reduced, so that ferrosilicon cannot be obtained in the step 3, and the main phases in the slag are C 2 S and CA 6.
Comparative example 4
The difference from example 4 is only that the melting temperature is 2000 ℃.
The comparative example was too high in melting temperature to obtain the target product, but the temperature conditions were difficult to achieve.
The mass fraction of silicon in the ferrosilicon alloy obtained in the step 3 is 89wt%, the mass fraction of iron is 11wt%, and the main phase in the obtained calcium aluminate is C 12A7 and also contains a small amount of CA; and (3) after the dissolution of the step (4), carrying out solid-liquid separation to obtain a sodium metaaluminate solution and leaching residues (the main component is CaCO 3).
Comparative example 5
The difference from example 4 was only that the dissolution temperature was 100 ℃.
The comparative example has an excessively high elution temperature, and a target product can be obtained, but the temperature condition is difficult to achieve.
And (3) after the dissolution of the step (4), carrying out solid-liquid separation to obtain a sodium metaaluminate solution and leaching residues (the main component is CaCO 3).
Comparative example 6
The difference from example 4 is only that the dissolution temperature is 10 ℃.
The comparative example has an excessively low dissolution temperature, and the target product can be obtained, but the corresponding dissolution efficiency is low, resulting in low recovery efficiency of aluminum resources.
And (3) after the dissolution of the step (4), carrying out solid-liquid separation to obtain a sodium metaaluminate solution and leaching residues (the main components are C 12A7 and CaCO 3).
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
1. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash is characterized by comprising the following steps of:
adding a calcareous additive into a mixture of aluminum ash and magnesium slag, and smelting to produce ferrosilicon alloy and calcium aluminate in the smelting process, wherein the calcium aluminate is directly used as premelting slag for steelmaking or used for preparing sodium metaaluminate and calcium carbonate.
2. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 1, wherein the mass of the aluminum ash is 0.7-1.0 times of the mass of the magnesium slag.
3. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 1, wherein the mass of the calcareous additive is 0-0.5 times of the mass of the magnesium slag in terms of the mass of calcium oxide, and the mass is not 0.
4. A method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 3, wherein the calcareous additive is calcium oxide or limestone.
5. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 1, wherein the smelting temperature is 1400-1600 ℃ and the heat preservation time is 1-4 h.
6. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 1, wherein the method for preparing sodium metaaluminate and calcium carbonate from calcium aluminate is as follows: and (3) dissolving out the calcium aluminate by adopting an alkaline solution, and carrying out solid-liquid separation after the dissolution is finished, wherein the obtained solution is a sodium metaaluminate solution, and the obtained leaching slag mainly comprises calcium carbonate.
7. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 6, wherein the alkaline solution contains carbon alkali and caustic alkali.
8. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 7, wherein the concentration of carbon alkali in the alkaline solution is 20-160 g/L, the concentration of caustic alkali is 0-20 g/L, and the concentration is not 0.
9. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 6, wherein the ratio of the calcium aluminate to the alkaline solution is 1g (5-10) mL.
10. The method for recovering valuable resources by co-processing magnesium slag and aluminum ash according to claim 6, wherein the temperature of the dissolution is 30-90 ℃ and the time is 0.5-3 h.
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