CN115704062A - Method for recovering valuable metals in electrolytic manganese slag and regenerating high-purity manganese salt - Google Patents
Method for recovering valuable metals in electrolytic manganese slag and regenerating high-purity manganese salt Download PDFInfo
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 106
- 239000011572 manganese Substances 0.000 title claims abstract description 106
- 239000002893 slag Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 29
- 150000002696 manganese Chemical class 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 title claims abstract description 23
- 150000002739 metals Chemical class 0.000 title claims abstract description 19
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 16
- 239000000706 filtrate Substances 0.000 claims abstract description 110
- 239000002904 solvent Substances 0.000 claims abstract description 55
- 230000005496 eutectics Effects 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910001437 manganese ion Inorganic materials 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- 238000004090 dissolution Methods 0.000 claims abstract description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 5
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 50
- 239000001257 hydrogen Substances 0.000 claims description 36
- 229910052739 hydrogen Inorganic materials 0.000 claims description 36
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 29
- 238000004821 distillation Methods 0.000 claims description 29
- 238000000498 ball milling Methods 0.000 claims description 27
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 16
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 claims description 15
- 235000019743 Choline chloride Nutrition 0.000 claims description 15
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical compound [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 claims description 15
- 229960003178 choline chloride Drugs 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 13
- 239000002244 precipitate Substances 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 10
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 9
- 238000003801 milling Methods 0.000 claims description 9
- 235000010413 sodium alginate Nutrition 0.000 claims description 9
- 239000000661 sodium alginate Substances 0.000 claims description 9
- 229940005550 sodium alginate Drugs 0.000 claims description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 8
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 8
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims description 6
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 claims description 6
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 5
- 238000011085 pressure filtration Methods 0.000 claims description 5
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 claims description 3
- JJCWKVUUIFLXNZ-UHFFFAOYSA-M 2-hydroxyethyl(trimethyl)azanium;bromide Chemical compound [Br-].C[N+](C)(C)CCO JJCWKVUUIFLXNZ-UHFFFAOYSA-M 0.000 claims description 3
- 150000001413 amino acids Chemical class 0.000 claims description 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims description 3
- 229960003237 betaine Drugs 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 229910000042 hydrogen bromide Inorganic materials 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- LSEFCHWGJNHZNT-UHFFFAOYSA-M methyl(triphenyl)phosphanium;bromide Chemical compound [Br-].C=1C=CC=CC=1[P+](C=1C=CC=CC=1)(C)C1=CC=CC=C1 LSEFCHWGJNHZNT-UHFFFAOYSA-M 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 239000012716 precipitator Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000001376 precipitating effect Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 238000013478 data encryption standard Methods 0.000 description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 41
- 238000000227 grinding Methods 0.000 description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 21
- 229910052742 iron Inorganic materials 0.000 description 19
- 239000002002 slurry Substances 0.000 description 19
- 238000005406 washing Methods 0.000 description 18
- 239000011656 manganese carbonate Substances 0.000 description 14
- 229940093474 manganese carbonate Drugs 0.000 description 14
- 235000006748 manganese carbonate Nutrition 0.000 description 14
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 14
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 description 12
- 239000002699 waste material Substances 0.000 description 12
- 238000000605 extraction Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 229960004887 ferric hydroxide Drugs 0.000 description 8
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical group [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 8
- 238000002386 leaching Methods 0.000 description 8
- 238000009210 therapy by ultrasound Methods 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000013048 microbiological method Methods 0.000 description 2
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
- 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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Abstract
The invention discloses a method for recovering valuable metals in water-washed electrolytic manganese residues and regenerating high-purity manganese salt. The process mainly comprises the following aspects: firstly, the particles are refined, so that the contact area between the particle surfaces and a solvent can be increased, and the dissolution rate is accelerated; secondly, dissolving metal oxides in the water-washed electrolytic manganese slag by adopting a green, low-cost and pollution-free eutectic solvent DES under the action of a multi-energy field coupling composite process; then, precipitating other metal elements except manganese by utilizing the solubility difference of valuable metal ions in water, and keeping the manganese ions in the solution; finally, high-purity manganese salt is obtained by a precipitation method, and DES filtrate can be recycled by a simple treatment mode. The method can improve the recovery efficiency of valuable metals; secondly, the eutectic solvent DES can be recycled, so that secondary pollution to the environment can not be caused; thirdly, the adopted DES has the advantages of greenness, no pollution, low cost, easy obtainment and the like, and is easy to realize industrial production.
Description
Technical Field
The invention relates to a method for recovering valuable metals in water-washed electrolytic manganese residues and regenerating high-purity manganese salt, belonging to the technical field of recovery and regeneration of electrolytic manganese residues.
Background
The manganese metal is called strategic metal, about 90 percent of the manganese metal is used in the steel industry every year, and 10 percent of the manganese metal is used in the departments of nonferrous metallurgy, chemical industry, electronics, batteries, agriculture and the like, and belongs to one of important basic raw materials of the industry in China. Meanwhile, china is the biggest electrolytic manganese producing country, consumer country and export country all over the world. The electrolytic manganese industry belongs to the high-pollution and high-emission industry, and a large amount of waste residues, namely the electrolytic manganese waste residues, can be generated. Manganese in the electrolytic manganese slag mainly exists in the forms of water-soluble manganese, manganese carbonate and manganese dioxide, wherein the water-soluble manganese is one form of the manganese slag which has the greatest harm to the environment in a natural state, and the electrolytic manganese slag is washed by water firstly to dissolve a part of water-soluble manganese and then discharged.
At present, electrolytic manganese enterprises mostly adopt centralized stacking or landfill treatment for electrolytic manganese waste residues, but long-term stacking causes waste of a large amount of land resources, and meanwhile, the washing process before the electrolytic manganese waste residues are discharged is not thorough, soluble manganese, ammonium sulfate and the like are contained in the electrolytic manganese waste residues, and a large amount of accumulated electrolytic manganese waste residues are washed by rainwater, and soluble manganese ions in the electrolytic manganese waste residues flow out along with the rainwater and are immersed in soil and surrounding water bodies to cause environmental pollution. Therefore, china has strict requirements on the construction of the slag yard, and for 1 ten thousand tons/year electrolytic manganese enterprises, the construction and annual maintenance costs of the slag yard are thousands of yuan, so that the enterprises are difficult to bear. Because of the over-high cost, many domestic electrolytic manganese enterprises do not strictly carry out stacking and landfill treatment of manganese slag according to the national standard, even random stacking.
At present, the recycling and resource utilization of electrolytic manganese slag mainly comprise: recovering valuable metal manganese by a microbiological method, recovering valuable metal manganese by an acid leaching method, and preparing a complete fertilizer by utilizing electrolytic manganese slag. The problem of low consumption of manganese slag exists in the preparation of the full-value fertilizer by using electrolytic manganese slag, and the requirement of large discharge amount of manganese slag cannot be met. For the acid leaching method to recover manganese, the cost is high and secondary pollution is caused. The microbiological method is environment-friendly, but has the problems of long leaching time and low leaching rate, and has higher requirements on strains and leaching conditions.
The washed electrolytic manganese slag has potential as a building raw material as waste slag generated in the electrolytic manganese industry, but the content of manganese metal elements in the washed electrolytic manganese slag is too high, so that the utilization degree of the manganese metal elements is limited, and the content of the manganese metal elements needs to be reduced before the manganese metal elements are used as the building raw material, so that the technical difficulty to be solved urgently in the field is to find a green pollution-free method for reducing the content of the manganese metal elements in the building raw material.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for recovering valuable metals in water-washed electrolytic manganese residues and regenerating high-purity manganese salt in an environment-friendly and pollution-free manner. Compared with other treatment methods, the method has the advantages that the leaching solution DES used in the method is green and low in toxicity, the leaching efficiency is high, the leaching solution DES can be recycled, and secondary pollution to the environment cannot be caused.
The specific technical scheme is as follows:
a method for recovering valuable metals in water-washed electrolytic manganese residues and regenerating high-purity manganese salt comprises the following steps:
step 1, refining the particles of the washed electrolytic manganese slag;
step 2, mixing the fine slag obtained in the step 1 with a eutectic solvent, accelerating the dissolution of metal oxides by a multi-energy field coupling composite process, and filtering to obtain a first filtrate;
step 3, adding water into the primary filtrate, combining with a part of metal ions to precipitate a part of hydroxide precipitate, and filtering the generated hydroxide precipitate to obtain a secondary filtrate containing manganese;
and 5, drying or carrying out high-temperature treatment on the manganese ion precipitate to obtain the high-purity manganese salt.
And distilling the third filtrate under reduced pressure to remove water, and recycling the obtained eutectic solvent.
In the step 1, the refining mode comprises one or more of stirring mill, ball mill, sand mill, vibration mill, tube mill, cone mill and rod mill.
In the step 2, the multi-energy field coupling composite process comprises one or more of ball milling, sanding, ultrasonic processing, heating and microwave processing.
The precipitant in step 4 is sodium alginate or carbonate.
The precipitant is added in a solid or liquid form, and the concentration of the carbonate solution is 0.05-40%, preferably 0.1-34%; the concentration of the sodium alginate solution is 0.05-5%, preferably 0.1-3%.
In the step 2, an external energy field is also needed in the dissolving process; the external energy field is one or more of ultrasound, heating and stirring, ball milling, stirring and grinding, sanding, vibration grinding, tube grinding, cone grinding and rod grinding.
In the step 2, the eutectic solvent is composed of a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond acceptor is generally selected from one or more of choline chloride, betaine, methyl triphenyl phosphonium bromide, choline bromide and benzyl triphenyl hydrogen bromide, and the hydrogen bond donor is generally selected from one or more of ethylene glycol, glycerol, urea, acetamide, amino acid, lactic acid and malonic acid.
In the step 2, the solid-to-liquid ratio of the fine slag to the eutectic solvent is 1 (0.5-100), preferably 1 (1-80).
The filtration mode in the step 2, the step 3 or the step 4 comprises one or more of gravity filtration, reduced pressure filtration, pressure filtration and centrifugal filtration.
In step 3, the ratio of water to primary filtrate is 0.2-50, preferably 0.5-10.
In the step 4, the reduced pressure distillation pressure is 0.6-47kPa, preferably 1.2-31kPa, and the temperature is 0-80 ℃, preferably 10-70 ℃.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
In order to facilitate the understanding of the present invention, the process route of the present invention will be described in more detail with reference to specific examples, which are only a part of the examples of the present invention, but the scope of the present invention is not limited thereto. Unless otherwise defined, all terms of art used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The water-washed electrolytic manganese slag to be treated in the invention mainly contains MnO and Fe 2 O 3 ，SO 3 And SiO 2 And the like, and also contains other metal oxides such as oxides of magnesium, aluminum, calcium, and the like. The method of the invention can effectively recover manganese salt and other metals.
S11, refining the particles of the washed electrolytic manganese slag to obtain refined particles of the washed electrolytic manganese slag;
s12, adding the refined water-washed electrolytic manganese residues into a eutectic solvent DES according to a certain proportion to form slurry;
s13, treating slurry formed by manganese slag and DES through a multi-energy field coupling-based composite process to accelerate the dissolution of metal oxides such as manganese, iron, aluminum, calcium and the like in the manganese slag and improve the recovery rate of valuable metals, and then filtering to obtain primary filter residue and primary filter liquor containing metal ions;
s14, adding water into the primary filtrate to enable other valuable metal ions except manganese in the filtrate to generate hydroxide precipitates (the main component is ferric hydroxide), and filtering to obtain a manganese-containing solution (secondary filtrate) and secondary filter residues;
s15, adding sodium alginate into the secondary filtrate to complex metal manganese ions and crosslink the sodium alginate to form manganese alginate gel precipitate, or adding carbonate into the secondary filtrate to generate water-insoluble manganese carbonate precipitate, and filtering to obtain a third filtrate and corresponding high-purity manganese salt;
s16, removing water in the third filtrate in a negative pressure distillation mode, and returning the obtained eutectic solvent DES to S11 for recycling;
s17, drying or treating the manganese ion precipitate at high temperature to obtain the high-purity manganese salt.
In one embodiment, in step S11, the refining manner includes one or more of stirring mill, ball mill, sand mill, vibration mill, tube mill, cone mill and rod mill.
In one embodiment, in step S12, the eutectic solvent DES is composed of a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond acceptor is generally selected from one or more of choline chloride, betaine, methyl triphenyl phosphonium bromide, choline bromide and benzyl triphenyl hydrogen bromide, and the hydrogen bond donor is generally selected from one or more of ethylene glycol, glycerol, urea, acetamide, amino acid, lactic acid and malonic acid.
In one embodiment, in the step S12, the solid-to-liquid ratio of the water-washed electrolytic manganese slag to the eutectic solvent DES is 1 (0.5-100), preferably 1 (1-80).
In one embodiment, in step S13, the multi-energy field coupling composite process includes one or more of ball milling, sand milling, ultrasound, heating, and microwave.
In one embodiment, in steps S13, S14 and S15, the filtration manner includes one or more of gravity filtration, reduced pressure filtration, pressure filtration and centrifugal filtration.
In one embodiment, in step S14, the ratio of water to primary filtrate is between 0.2 and 50, preferably between 0.5 and 10.
In one embodiment, in step S14, the metal ions in the second filtrate are mainly manganese ions.
In one embodiment, in step S14, the secondary filter residue is mainly ferric hydroxide.
In one embodiment, in step S15, sodium alginate is added directly or in a sodium alginate solution, the concentration of the sodium alginate solution being 0.05% to 5%, preferably 0.1% to 3%.
In one embodiment, in step S15, carbonate is added directly or a carbonate solution is added, the concentration of the carbonate solution being 0.05% to 40%, preferably 0.1% to 34%.
In one embodiment, in step S16, the sub-atmospheric distillation pressure is in the range of from 0.6 to 47kPa, preferably from 1.2 to 31kPa, and the temperature is in the range of from 0 to 80 ℃, preferably from 10 to 70 ℃.
Example 1
And adding the water-washed electrolytic manganese slag into a ball mill, carrying out dry-method ball milling crushing, adding a 2mm grinding ball, setting the rotation speed of an instrument to be 1000r/min, and carrying out ball milling for 1h to obtain the water-washed electrolytic manganese slag with the D50 of 27 mu m. Preparing a eutectic solvent DES from hydrogen bond donor ethylene glycol and a hydrogen bond acceptor choline chloride according to the molar ratio of 2 to 1, mixing the eutectic solvent DES and the crushed water-washed electrolytic manganese slag according to the solid-liquid ratio of 1 to 2, adding the mixture into an ultrasonic pool, and carrying out ultrasonic treatment for 5 hours. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.5%, and the iron content is 2%.
And (2) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 2, fully stirring and filtering to obtain a secondary filtrate and secondary filter residue of which the main component is ferric hydroxide, wherein the manganese content in the secondary filtrate is 2%, the iron content is 14ppm, and the extraction efficiency of manganese elements is 80%.
Adding sodium carbonate into the second filtrate, stirring thoroughly, and filtering to obtain manganese carbonate with purity of 95.2% and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at room temperature under the pressure of 1700Pa, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
Example 2
Preparing a hydrogen bond donor glycol and a hydrogen bond acceptor choline chloride into a eutectic solvent DES according to the mol ratio of 2 to 1, mixing the eutectic solvent DES and water-washed electrolytic manganese slag according to the solid-liquid ratio of 1 to 2, adding the mixture into a ball mill, carrying out wet ball milling crushing, adding a 2mm grinding ball, setting the rotating speed of the instrument at 1000r/min, and carrying out ball milling for 1h to obtain the water-washed electrolytic manganese slag with the D50 of 26 um. And adding the ball-milled slurry into an ultrasonic pool, and carrying out ultrasonic treatment for 5 hours. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.4%, and the iron content is 1.2%.
And (2) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 2, fully stirring and filtering to obtain a secondary filtrate and secondary filter residues with the main components of silicon dioxide and ferric hydroxide, wherein the manganese content in the secondary filtrate is 2.4%, the iron content in the secondary filtrate is 15ppm, and the extraction efficiency of manganese elements is 84%.
Adding sodium carbonate into the second filtrate, fully stirring and filtering to obtain manganese carbonate with the purity of 96.3 percent and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, performing negative pressure distillation at room temperature under the pressure of 1700Pa, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
Example 3
And adding the water-washed electrolytic manganese slag into a ball mill, carrying out dry-method ball milling crushing, adding a 2mm grinding ball, setting the rotation speed of an instrument to be 1000r/min, and carrying out ball milling for 1h to obtain the water-washed electrolytic manganese slag with the D50 of 25 um. Preparing hydrogen bond donor glycerol and hydrogen bond acceptor choline chloride into a eutectic solvent DES according to the mol ratio of 1 to 2.3, mixing the eutectic solvent DES and the crushed water-washed electrolytic manganese slag according to the solid-liquid ratio of 1 to 10, adding the mixture into an ultrasonic pool, and carrying out ultrasonic treatment for 6 hours. And then filtering the slurry to obtain a first filter residue and a first filtrate, wherein the manganese content in the first filter residue is 0.4%, the iron content is 1%, and the extraction efficiency of the manganese element is 85%.
And (3) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 3.
Adding sodium carbonate into the second filtrate, stirring thoroughly, and filtering to obtain manganese carbonate with purity of 96.4% and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment for negative pressure distillation, wherein the pressure is 19.5kPa, the temperature is 60 ℃, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
Example 4
Preparing a eutectic solvent DES from hydrogen bond donor urea and hydrogen bond acceptor choline chloride according to the molar ratio of 2 to 1, mixing the eutectic solvent DES and water-washing electrolytic manganese slag according to the solid-liquid ratio of 1 to 20, adding the mixture into a ball mill, performing wet ball milling and crushing, adding a grinding ball with the thickness of 1mm, setting the rotation speed of an instrument to be 1500r/min, and performing ball milling for 2 hours to obtain the water-washing electrolytic manganese slag with the D50 of 20 micrometers. And heating and stirring the slurry after ball milling for 2h. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.6%, and the iron content is 2%.
And (2) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5.
Adding sodium carbonate into the second filtrate, fully stirring, and filtering to obtain the manganese carbonate with the purity of 94.8 percent and the third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 5480Pa and 35 ℃, recovering to obtain a eutectic solvent DES, and continuously using the eutectic solvent DES for treating the water-washed electrolytic manganese slag.
Example 5
Preparing hydrogen bond donor malonic acid and hydrogen bond acceptor choline chloride into a eutectic solvent DES according to the mol ratio of 1. And heating and stirring the slurry subjected to ball milling for 3 hours. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.9%, and the iron content is 6%.
And (3) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5, fully stirring and filtering to obtain a secondary filtrate and secondary filter residues with the main components of silicon dioxide and ferric hydroxide, wherein the manganese content in the secondary filtrate is 1.6%, the iron content in the secondary filtrate is 195ppm, and the extraction efficiency of manganese elements is 88%.
Adding sodium carbonate into the second filtrate, stirring thoroughly, and filtering to obtain manganese carbonate with purity of 93.2% and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
Example 6
Preparing a hydrogen bond donor ethylene glycol and a hydrogen bond acceptor choline chloride into an eutectic solvent DES according to the molar ratio of 2 to 1, mixing the eutectic solvent DES and water-washing electrolytic manganese slag according to the solid-liquid ratio of 1 to 25, adding the mixture into a ball mill, performing wet ball milling and crushing, adding a 1mm grinding ball, setting the rotation speed of the ball mill to be 1000r/min, performing ball milling for 0.5h to obtain water-washing electrolytic manganese slag with the D50 of 29 mu m, performing fine milling by using a sand mill, wherein the size of the grinding ball is 0.5mm, the rotation speed of the instrument is 3000r/min, and the sand milling time is 0.2h to obtain the water-washing electrolytic manganese slag with the D50 of 600 nm. And adding the sanded slurry into an ultrasonic pool, and carrying out ultrasonic treatment for 5 hours. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.1%, and the iron content is 4%.
And (3) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5, fully stirring and filtering to obtain a secondary filtrate and secondary filter residues with the main components of silicon dioxide and ferric hydroxide, wherein the manganese content in the secondary filtrate is 1.8%, the iron content in the secondary filtrate is 195ppm, and the extraction efficiency of manganese elements is 91%.
Adding sodium carbonate into the second filtrate, stirring thoroughly, and filtering to obtain manganese carbonate with purity of 96.1% and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
Example 7
Preparing a hydrogen bond donor glycol and a hydrogen bond acceptor choline chloride into a eutectic solvent DES according to the mol ratio of 2 to 1, mixing the eutectic solvent DES and water-washing electrolytic manganese slag according to the solid-liquid ratio of 1 to 10, adding the mixture into a ball mill, carrying out wet ball milling crushing, adding a 1mm grinding ball, setting the rotating speed of the instrument to be 1000r/min, carrying out ball milling for 0.5h to obtain water-washing electrolytic manganese slag with D50 of 28um, carrying out fine milling by using a sand mill, wherein the size of the grinding ball is 0.5mm, the rotating speed of the instrument is 3000r/min, and the grinding time is 1h to obtain the water-washing electrolytic manganese slag with D50 of 292 nm. And adding the sanded slurry into an ultrasonic pool, and carrying out ultrasonic treatment for 3h. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.1%, and the iron content is 3.8%.
And (3) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5, fully stirring and filtering to obtain a secondary filtrate and secondary filter residues with the main components of silicon dioxide and ferric hydroxide, wherein the manganese content in the secondary filtrate is 2.1%, the iron content is 156ppm, and the extraction efficiency of manganese elements is 94%.
Adding sodium carbonate into the second filtrate, stirring thoroughly, and filtering to obtain manganese carbonate with purity of 97.2% and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, recovering to obtain a eutectic solvent DES, and continuously using the eutectic solvent DES for treating the water-washed electrolytic manganese slag.
Example 8
Preparing a eutectic solvent DES from hydrogen bond donor urea and a hydrogen bond acceptor choline chloride according to the molar ratio of 2 to 1, mixing the eutectic solvent DES and water-washing electrolytic manganese slag according to the solid-liquid ratio of 1 to 5, adding the mixture into a ball mill, performing wet ball milling crushing, adding a 1mm grinding ball, setting the rotation speed of the instrument to be 1000r/min, performing ball milling for 0.5h to obtain water-washing electrolytic manganese slag with D50 of 29um, performing fine milling by using a sand mill, wherein the size of the grinding ball is 0.5mm, the rotation speed of the instrument is 3000r/min, and the sand milling time is 0.2h to obtain the water-washing electrolytic manganese slag with D50 of 600 nm. And adding the sanded slurry into an ultrasonic pool, and carrying out ultrasonic treatment for 5 hours. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.5%, and the iron content is 8%.
And (2) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5.
Adding sodium carbonate into the second filtrate, fully stirring and filtering to obtain the manganese carbonate with the purity of 92.7 percent and the third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
Comparative example 1
The differences from example 7 are: the manganese waste residue is not subjected to ball milling treatment for grain refinement, and an energy field is not added in the DES dissolving process.
Preparing a hydrogen bond donor glycol and a hydrogen bond acceptor choline chloride into a eutectic solvent DES according to the molar ratio of 2 to 1, uniformly mixing the eutectic solvent DES and the water-washed electrolytic manganese slag according to the solid-liquid ratio of 1 to 10, and standing for 4.5 hours. And then filtering to obtain a first filter residue and a first filtrate, wherein the manganese content in the first filter residue is 4%, and the iron content in the first filter residue is 15%.
And (3) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5, fully stirring and filtering to obtain a secondary filtrate and secondary filter residues with the main components of silicon dioxide and ferric hydroxide, wherein the manganese content in the secondary filtrate is 0.06%, the iron content in the secondary filtrate is 62ppm, and the extraction efficiency of manganese elements is 45%.
Adding sodium carbonate into the second filtrate, stirring thoroughly, and filtering to obtain manganese carbonate with purity of 95.1% and third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, recovering to obtain a eutectic solvent DES, and continuously using the eutectic solvent DES for treating the water-washed electrolytic manganese slag.
Comparative example 2
The difference from example 7 is that: the manganese waste residue is not subjected to ball milling treatment for grain refinement.
Preparing a eutectic solvent DES from hydrogen bond donor ethylene glycol and a hydrogen bond acceptor choline chloride according to the molar ratio of 2 to 1, mixing the eutectic solvent DES and water-washed electrolytic manganese slag according to the solid-liquid ratio of 1 to 10, adding the mixture into an ultrasonic pool, and carrying out ultrasonic treatment for 4.5h. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 2.6%, and the iron content is 11%.
And (2) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5.
Adding sodium carbonate into the second filtrate, fully stirring and filtering to obtain the manganese carbonate with the purity of 91.3 percent and the third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, recovering to obtain a eutectic solvent DES, and continuously using the eutectic solvent DES for treating the water-washed electrolytic manganese slag.
Comparative example 3
The difference from example 7 is that: no energy field was applied during DES dissolution.
Preparing a hydrogen bond donor ethylene glycol and a hydrogen bond acceptor choline chloride into an eutectic solvent DES according to the molar ratio of 2 to 1, mixing the eutectic solvent DES and water-washing electrolytic manganese slag according to the solid-liquid ratio of 1 to 10, adding the mixture into a ball mill, performing wet ball milling and crushing, adding a 1mm grinding ball, setting the rotation speed of the instrument to be 1000r/min, performing ball milling for 0.5h to obtain water-washing electrolytic manganese slag with D50 of 28 mu m, performing fine grinding by using a sand mill, wherein the size of the grinding ball is 0.5mm, the rotation speed of the instrument is 3000r/min, and performing sand milling for 1h to obtain water-washing electrolytic manganese slag with D50 of 298 nm. Standing the refined water-washed electrolytic manganese slag for 3h. And then filtering to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 3.2%, and the iron content in the primary filter residue is 13%.
And (2) adding water into the primary filtrate, wherein the ratio of the water to the primary filtrate is 5.
Adding sodium carbonate into the second filtrate, fully stirring, and filtering to obtain the manganese carbonate with the purity of 94.4 percent and the third filtrate.
And transferring the third filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, recovering to obtain a eutectic solvent DES, and continuously using the eutectic solvent DES for treating the water-washed electrolytic manganese slag.
Comparative example 4
The difference from example 7 is that: no water was added to the primary filtrate and a secondary filtration treatment was performed.
Preparing a hydrogen bond donor glycol and a hydrogen bond acceptor choline chloride into a eutectic solvent DES according to the mol ratio of 2 to 1, mixing the eutectic solvent DES and water-washing electrolytic manganese slag according to the solid-liquid ratio of 1 to 10, adding the mixture into a ball mill, carrying out wet ball milling crushing, adding a 1mm grinding ball, setting the rotating speed of the instrument to be 1000r/min, carrying out ball milling for 0.5h to obtain water-washing electrolytic manganese slag with D50 of 28um, carrying out fine milling by using a sand mill, wherein the size of the grinding ball is 0.5mm, the rotating speed of the instrument is 3000r/min, and the grinding time is 1h to obtain the water-washing electrolytic manganese slag with D50 of 292 nm. And adding the sanded slurry into an ultrasonic pool, and carrying out ultrasonic treatment for 3h. And then filtering the slurry to obtain primary filter residue and primary filtrate, wherein the manganese content in the primary filter residue is 0.1%, and the iron content is 3.8%.
Adding 15% sodium carbonate solution into the first filtrate, stirring thoroughly, filtering to obtain manganese carbonate with purity of 60.2% and second filtrate, wherein extraction efficiency of manganese element is 89%.
And transferring the second filtrate to continuous negative pressure distillation equipment, carrying out negative pressure distillation at 4240Pa and 30 ℃, and recovering to obtain a eutectic solvent DES which can be continuously used for treating the water-washed electrolytic manganese residues.
| Experiment of | Extraction efficiency of manganese (%) | Purity of manganese salt (%) |
| Example 1 | 80 | 95.2 |
| Example 2 | 84 | 96.3 |
| Example 3 | 85 | 96.4 |
| Example 4 | 85 | 94.8 |
| Example 5 | 88 | 93.2 |
| Example 6 | 91 | 96.1 |
| Example 7 | 94 | 97.2 |
| Example 8 | 79 | 92.7 |
| Comparative example 1 | 45 | 95.1 |
| Comparative example 2 | 68 | 91.3 |
| Comparative example 3 | 57 | 94.4 |
| Comparative example 4 | 89 | 60.2 |
As can be seen from the table above, the method can efficiently separate the manganese ions from the water-washed electrolytic manganese slag, and has the advantages of good extraction efficiency and high purity; compared with the embodiment, the extraction efficiency is improved by performing ball milling treatment on the waste residue, and the separation efficiency is improved by applying an energy field in the DES dissolving process; as can be seen by comparing comparative example 4 with example 7, by adding water to the first filtrateMaking Fe 3+ Ion conversion to colloidal Fe (OH) 3 The method can separate manganese ions from the manganese ions, improves the purity of the recovered manganese salt, adopts DES (data encryption standard) which has the advantages of greenness, no pollution, low cost, easy obtainment and the like, can be recycled, and is beneficial to the reutilization of resources.
Claims (10)
1. A method for recovering valuable metals in water-washed electrolytic manganese residues and regenerating high-purity manganese salt is characterized by comprising the following steps:
step 1, refining the particles of the water-washed electrolytic manganese slag;
step 2, mixing the fine slag obtained in the step 1 with a eutectic solvent, accelerating the dissolution of metal oxides by a multi-energy field coupling composite process, and filtering to obtain a first filtrate;
step 3, adding water into the primary filtrate, combining with a part of metal ions to precipitate a part of hydroxide precipitate, and filtering the generated hydroxide precipitate to obtain a secondary filtrate containing manganese;
step 4, adding a precipitator into the second filtrate, generating precipitates with manganese ions, and filtering to obtain manganese ion precipitates and a third filtrate;
and 5, drying or treating the manganese ion precipitate at high temperature to obtain the high-purity manganese salt.
2. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salt according to claim 1,
and (4) removing water from the third filtrate by reduced pressure distillation, and recycling the obtained eutectic solvent.
3. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salts according to claim 2, characterized in that the reduced pressure distillation gas pressure is 0.6 to 47kPa, preferably 1.2 to 31kPa, and the temperature is 0 to 80 ℃, preferably 10 to 70 ℃.
4. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salt according to claim 1, wherein in the step 1, the refining mode comprises one or more of stirring mill, ball mill, sand mill, vibration mill, tube mill, cone mill and rod mill.
5. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salts according to claim 1, wherein in the step 2, the composite process of multi-energy field coupling comprises one or more of ball milling, sand milling, ultrasound, heating and microwave.
6. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salt according to claim 1, wherein the precipitant in step 4 is selected from sodium alginate or carbonate.
7. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salt according to claim 4, wherein the precipitant is added in a solid or liquid form, and the concentration of the carbonate solution is 0.05% -40%, preferably 0.1% -34%; the concentration of the sodium alginate solution is 0.05-5%, preferably 0.1-3%.
8. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salts as claimed in claim 1, wherein in the step 2, the eutectic solvent is composed of a hydrogen bond donor and a hydrogen bond acceptor, wherein the hydrogen bond acceptor is generally selected from one or more of choline chloride, betaine, methyl triphenyl phosphonium bromide, choline bromide and benzyl triphenyl hydrogen bromide, and the hydrogen bond donor is generally selected from one or more of ethylene glycol, glycerol, urea, acetamide, amino acids, lactic acid and malonic acid.
9. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salt according to claim 1, wherein in the step 2, the solid-to-liquid ratio of the fine residues to the eutectic solvent is 1 (0.5-100), preferably 1 (1-80).
10. The method for recovering valuable metals from water-washed electrolytic manganese residues and regenerating high-purity manganese salt according to claim 1, wherein the filtration manner in step 2, step 3 or step 4 comprises one or more of gravity filtration, reduced pressure filtration, pressurized filtration and centrifugal filtration.
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| CN105417584A (en) * | 2015-12-09 | 2016-03-23 | 西南科技大学 | Method for recycling manganese from electrolyzed manganese ore residues |
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