CN113737006A - Method for extracting magnesium from refined magnesium waste solid slag - Google Patents
Method for extracting magnesium from refined magnesium waste solid slag Download PDFInfo
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- CN113737006A CN113737006A CN202111091104.4A CN202111091104A CN113737006A CN 113737006 A CN113737006 A CN 113737006A CN 202111091104 A CN202111091104 A CN 202111091104A CN 113737006 A CN113737006 A CN 113737006A
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- solid slag
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 48
- 239000011777 magnesium Substances 0.000 title claims abstract description 48
- 239000002893 slag Substances 0.000 title claims abstract description 30
- 239000002699 waste material Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007787 solid Substances 0.000 title claims abstract description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 16
- 230000004907 flux Effects 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012452 mother liquor Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 3
- 238000012216 screening Methods 0.000 claims abstract description 3
- 238000000926 separation method Methods 0.000 claims abstract description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 13
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 claims description 11
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 7
- 229910052788 barium Inorganic materials 0.000 claims description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 7
- 229910001626 barium chloride Inorganic materials 0.000 claims description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims 1
- 238000003801 milling Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- 231100000086 high toxicity Toxicity 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 6
- 239000010459 dolomite Substances 0.000 description 4
- 229910000514 dolomite Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- 108091006629 SLC13A2 Proteins 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
- C01F5/305—Dehydrating ammonium or alkali magnesium chlorides, e.g. carnalite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
- C22B26/22—Obtaining magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for preparing magnesium from refined magnesium waste solid slag, belongs to the field of industrial manufacturing technology and environment-friendly resource comprehensive utilization, and is a method for preparing magnesium metal by dry separation and extraction of coarse magnesium particles from refined magnesium and alloy waste solid slag, dissolution of residual mother liquor by water, and filtration of solid slag. The method can solve the problems of increasing energy consumption, wasting resources and not thoroughly eliminating waste residues containing high toxicity, can achieve the comprehensive utilization of resources to protect the environment, can produce metal magnesium and flux products with high added values, and lays a foundation for the sustainable development of the magnesium industry. Crushing the refined magnesium slag, screening and winnowing to obtain coarse magnesium particles. Can be used as raw material for preparing magnesium. Dissolving and filtering the remainder, evaporating, concentrating, dehydrating, melting, cooling and crushing the mother liquor to prepare the flux for producing the magnesium metal and the magnesium alloy. Drying the filtered solid slag containing more than 80% of magnesium oxide to prepare the best raw material for producing the metal magnesium.
Description
Technical Field
The invention belongs to the field of industrial manufacturing technology and comprehensive utilization of environmental protection resources, and relates to a method for preparing magnesium metal by dry separation and extraction of coarse magnesium particles from waste solid slag of refined magnesium and magnesium alloy, dissolution of a mother solution of residues by water, filtration of the solid slag and further preparation of magnesium metal.
Background
At home and abroad, the metal magnesium and magnesium alloy are not only widely applied to the fields of aerospace, military, traffic (including automobile, airplane, motorcycle, bicycle industry and the like), and the like, but also are further applied to the fields of electronic technology, optical equipment and other precision machinery along with the increasing refinement of the electronic technology. The reserve and the yield of magnesium resources in China are at the top of the world; the yield is above 2/3 worldwide. The built productivity of magnesium and magnesium alloy breaks through million tons, wherein the productivity is mainly distributed in 60 million T/year in Shaanxi, 20 million T/year in Shanxi and 20 million T/year in Ningxia. The rapid rise of the magnesium industry has great significance for integrally improving the national economic level. And a huge environmental burden is generated during production and utilization. The defects of low technical level, high pollution and high energy consumption still exist in part of the current magnesium metal industry in China. And the refined waste slag is about 200 KG-300 KG when one ton of magnesium is produced, and the total amount of magnesium-smelting waste slag discharged every year in China is more than 20 ten thousand tons. At present, most enterprises of the refining waste residues can not recycle and are generally discharged to remote places. Over time, on the one hand, these residues undergo weathering to form dust which drifts around to pollute the environment. On the other hand, the waste residues contain a large amount of alkaline substances, and can be dissolved and taken away by water under the driving action of rainwater, so that the surrounding soil is alkalized, and underground water sources are polluted. If the water is not hard, the underground water source is changed into hard water due to the increase of calcium and magnesium ions; the waste residue contains barium chloride which is very soluble in water to form highly toxic pollution. Some enterprises construct leakage-free waste solid discharge fields [1] by huge capital consumption, but cannot ensure that the waste materials cannot leak after being continuously accumulated and moved geologically. Finally, hidden troubles are buried for later people, and the problem of pollution sources cannot be thoroughly solved once and for all. This problem cannot be solved and eventually limits the development of the magnesium industry. Therefore, it is very important to effectively utilize the waste solid slag of magnesium smelting to avoid secondary discharge. The existing methods for treating refined magnesium slag basically comprise the following two methods:
1. the flux consumption is increased and then the refining is carried out to extract the metal magnesium, so that the energy consumption is increased, and the waste residue containing the high toxicity is continuously generated.
2. The dilute hydrochloric acid is used to dissolve refined magnesium slag to prepare carnallite and magnesium chloride [2], and this process needs to consume a lot of hydrochloric acid and sodium carbonate, but rather the magnesium grains with high value are produced into low-value magnesium chloride, and the waste slag is still produced secondarily.
The two methods increase energy consumption, waste resources and cannot thoroughly eliminate waste residues. The only method for producing the flux in China at present is to dehydrate and prepare the raw material of the water-containing carnallite which is unique in the Carlo salt lake in the Guermu area of Qinghai province in China. The raw material of the water-containing carnallite is extremely expensive, is mainly used as a raw material of potash fertilizer, and can be used as a raw material of electrolytic magnesium metal. Therefore, a method which is completely beautiful, saves energy, thoroughly decomposes and comprehensively utilizes resources, protects the environment and can produce high-quality products must be developed.
Disclosure of Invention
In order to solve the problems of increasing energy consumption, wasting resources and recycling waste residues, achieve the purposes of protecting the environment and thoroughly and comprehensively utilizing resources, lay the foundation for the sustainable development of the magnesium industry, and provide high-quality products, the following manufacturing method is developed:
1. collecting the waste refined magnesium slag of the magnesium metal and magnesium alloy plant, and separating 15-2.5% of coarse magnesium particles by crushing (the particle size is less than 5 mm), screening, pulverizing and winnowing. The product can be refined to purify the magnesium metal. Namely a semi-finished product raw material for producing the metal magnesium.
2. The residue, as shown in Table 1, was added with an appropriate amount of SO-free water４ ２－Water, stirring, dissolving (MgCl)2、KCl、BaCl2、CaC12And NaC1 are all dissolved in water, and MgO and the like are not dissolved in water) to make the solution saturated, filtering, evaporating the mother liquor, concentrating, cooling, crystallizing, and centrifugally dewatering to extract the hydrous carnallite, the standard of which is shown in Table 2. The main component of the filtered solid slag is magnesium oxide. And (4) cooling and recycling the water vapor generated by evaporating the mother liquor.
Table 1: composition table of residual refined magnesium slag
| Composition (I) | MgCl２ | KCl | BaC12 | NaC1 | MgO |
| Content (%) | 53.0 | 30.0 | 1.5 | 6.0 | 5.28 |
| Composition (I) | CaC12 | CaF2 | Dust | Fe２＋+Cu２＋ | Mn２＋ |
| Content (%) | 3.0 | 0.5 | 0.5 | 0.2 | 0.02 |
Table 2: composition table of hydrous carnallite
3. The hydrous carnallite is added with MgCl with purity of more than 95 percent according to the proportion of the hydrous carnallite which can produce barium flux standard shown in the table 3 after the test2、KCl、BaCl2Heating to 750 deg.C in stainless steel pot, dewatering and melting, cooling to 30-50 deg.C, and crushing to obtain dewatered carnallite, also called flux, whose index is regulated to the barium flux standard shown in Table 3. If no pure MgCl is added2、KCl、BaCl2Products as shown in Table 4 were produced. The product is a necessary flux for producing metal magnesium and magnesium alloy, and at least 120 kg of barium flux is used for producing one ton of metal magnesium.
Table 3: barium flux reference standard table
| Index name | Index (I) | Index name | Index (I) |
| MgCl２Content (%) | 38～46 | Water-insoluble matter, ash content (%) | ≤O.5 |
| KCl content (%) | 32～40 | Ignition loss (%) | ≤2.0 |
| MgO content (%) | ≤1.5 | Total content of sodium chloride and calcium chloride (%) | ≤8.0 |
| BaC12Content (%) | 5.0～8.0 |
Table 4: index table for natural dehydration product
| Index name | Index (I) | Index name | Index (I) |
| MgCl２Content (%) | 47～54 | Water-insoluble matter, ash content (%) | ≤O.5 |
| KCl content (%) | 30～42 | Ignition loss (%) | ≤1.5 |
| BaC12Content (%) | 1～3 | Total content of sodium chloride and calcium chloride (%) | ≤8.0 |
| MgO content (%) | ≤1.5 |
4. Hydrogen chloride gas and water vapor generated in the dehydration and melting process are absorbed and condensed to generate diluted hydrochloric acid which is received into a glass fiber reinforced plastic vessel, and then a proper amount of filtered solid slag with the main component of magnesium oxide is added to prepare MgCl2. The product is also a raw material for producing the fusing agent, and then the fusing agent is repeatedly produced.
5. And thoroughly cleaning the filtered solid slag again to ensure that soluble salt does not remain in the slag, filtering for the second time, returning unsaturated mother liquor to the dissolving process for repeated use, drying the filtered solid slag to obtain the magnesium oxide with the content of more than 80 percent, and preparing the best-quality raw material for producing the metal magnesium. Referred to herein as the magnesia feedstock.
The most widely used Pidgeon process for smelting magnesium in domestic magnesium smelting industry, and the most representative silicothermic process for smelting magnesium, is to calcine dolomite (MgCO)3CaCO3= MgO•CaO+2CO2℃. (w) (Si) =75%) and fluorite powder (w (CaF) =95%) are ground and mixed with the ferrosilicon powder to prepare balls (the ball preparation pressure is 9.8-29.4 MPa), the balls are conveyed into a heat-resistant steel reduction tank, and the balls are reduced into crude magnesium under the vacuum conditions of l 190-l 210 ℃ and 1.33-10 Pa, wherein the reaction process is that 2(MgOCaO) Si =2Mg ℃ = 2CaOSiO2And refining by using a flux to produce the magnesium metal. The general calcined dolomite component is CaO 32.50%; 20.58 percent of MgO; fe2O32.18%；SiO20.96 percent; loss on ignition (CO)2) 43.78% of the magnesium oxide raw material is added according to a certain proportion before the mixing and ball making stage in the process of producing the magnesium metal by adopting the silicothermic Pidgeon magnesium smelting process. 4 tons of dolomite can be used instead of 1 ton of the raw material, and the carbon dioxide emission of calcining 4 tons of dolomite is correspondingly reduced. And can also reduce the dosage of a large amount of ferrosilicon. The raw material cost is remarkably reduced.
In the whole process of treating the metal magnesium and magnesium alloy refining waste solid slag, the produced gas, liquid and solid are all comprehensively utilized in the production of magnesium.
Reference to the literature
[1] Influence of Liu Feng, magnesium salt/mineralized refuse modification on gas production performance of sewage and sludge [ J ]. Sichuan environment, 2013,32(04):28-32.
[2] Sea lake salt and chemical industry, stage 1 in 2006.
Claims (1)
1. The method for preparing magnesium from refined magnesium waste solid slag is characterized in that the method is prepared by taking refined magnesium and magnesium alloy waste solid slag as raw materials through the following processing technology:
(1) crushing the refined magnesium slag to obtain particles with the particle size of less than 5mm, screening, milling, and separating out 15-2.5% of coarse magnesium particles by air separation;
(2) adding appropriate amount of SO-free residue to the residue４ ２－Stirring and dissolving the solution to make the solution in a saturated state, filtering, evaporating the mother liquor, concentrating, cooling, crystallizing, and centrifugally dewatering to extract the water-containing carnallite;
(3) adding MgCl with purity of more than 95 percent into the carnallite containing water according to the proportion which can produce barium flux standard shown in the table 1 after the test２、KCl、BaCl２Heating to 750 deg.C in a crucible, dewatering and melting completely, cooling the melt to 30-50 deg.C, crushing to obtain dewatered carnallite, also called flux finished product, whose index is regulated to the barium flux standard shown in Table 1, if no pure MgCl is added２、KCl、BaCl２The products shown in Table 2 were obtained;
table 1: barium flux reference standard table
Table 2: index table for natural dehydration product
(4) Hydrogen chloride gas and water vapor generated in the processes of dehydration and melting are absorbed and condensed to generate diluted hydrochloric acid which is received into a glass fiber reinforced plastic vessel, and then a proper amount of filtered solid slag with the main component of magnesium oxide is added to prepare MgCl２The product is also a raw material for producing the fusing agent, and then the fusing agent is repeatedly produced;
(5) and thoroughly cleaning the filtered solid slag again to ensure that soluble salt does not remain in the slag, filtering for the second time, returning unsaturated mother liquor to the dissolving process for repeated use, drying the filtered solid slag to obtain the raw material for producing the metal magnesium, wherein the content of magnesium oxide is more than 80%.
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| CN202111091104.4A Pending CN113737006A (en) | 2021-09-17 | 2021-09-17 | Method for extracting magnesium from refined magnesium waste solid slag |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140765A (en) * | 1995-07-15 | 1997-01-22 | 兰州大学 | Treating method for waste slag of smelting magnesium |
| CN101704010A (en) * | 2009-08-31 | 2010-05-12 | 张伟 | Method for stepwise preparing coarse magnesium grains, fusing agent and magnesium bricks from refined magnesium slag |
| CN102424916A (en) * | 2011-12-20 | 2012-04-25 | 石嘴山市凯瑞镁化有限公司 | Method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag |
| CN107075611A (en) * | 2014-04-14 | 2017-08-18 | 湖南斯瑞摩科技有限公司 | A kind of environment-friendly treatment method of refined magnesium slag |
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2021
- 2021-09-17 CN CN202111091104.4A patent/CN113737006A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140765A (en) * | 1995-07-15 | 1997-01-22 | 兰州大学 | Treating method for waste slag of smelting magnesium |
| CN101704010A (en) * | 2009-08-31 | 2010-05-12 | 张伟 | Method for stepwise preparing coarse magnesium grains, fusing agent and magnesium bricks from refined magnesium slag |
| CN102424916A (en) * | 2011-12-20 | 2012-04-25 | 石嘴山市凯瑞镁化有限公司 | Method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag |
| CN107075611A (en) * | 2014-04-14 | 2017-08-18 | 湖南斯瑞摩科技有限公司 | A kind of environment-friendly treatment method of refined magnesium slag |
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Application publication date: 20211203 |