CN105567977B - A kind of method of pyrogenic attack silver anode slime - Google Patents
A kind of method of pyrogenic attack silver anode slime Download PDFInfo
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- CN105567977B CN105567977B CN201610043501.7A CN201610043501A CN105567977B CN 105567977 B CN105567977 B CN 105567977B CN 201610043501 A CN201610043501 A CN 201610043501A CN 105567977 B CN105567977 B CN 105567977B
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- Prior art keywords
- silver
- anode slime
- gold
- silver anode
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- 229910052709 silver Inorganic materials 0.000 title claims abstract description 59
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000004332 silver Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001698 pyrogenic effect Effects 0.000 title claims abstract description 11
- 239000010931 gold Substances 0.000 claims abstract description 42
- 229910052737 gold Inorganic materials 0.000 claims abstract description 35
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 34
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 27
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 26
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 15
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 14
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 14
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 claims abstract description 14
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005864 Sulphur Substances 0.000 claims abstract description 13
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 11
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 7
- 150000002739 metals Chemical class 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 3
- 239000010953 base metal Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910052745 lead Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229910052946 acanthite Inorganic materials 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000007499 fusion processing Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- FSJWWSXPIWGYKC-UHFFFAOYSA-M silver;silver;sulfanide Chemical compound [SH-].[Ag].[Ag+] FSJWWSXPIWGYKC-UHFFFAOYSA-M 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 235000017550 sodium carbonate Nutrition 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 150000005324 oxide salts Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- 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
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
- C22B11/021—Recovery of noble metals from waste materials
- C22B11/023—Recovery of noble metals from waste materials from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge
-
- 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
-
- 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 discloses a kind of method of pyrogenic attack silver anode slime, it is that silver anode slime is polished with adding progress congruent melting refining in furnace chamber from reverberatory furnace charge door after sulphur, sodium carbonate dispensing, now silver and copper, the form of bismuth heavy metal sulphidisation enter in silver-colored sulfonium slag, platinum, palladium noble metal are still entered in thick gold with metallic state together with gold, so as to reach the purpose of separation；Then sulfonium slag returns to silver-colored smelting system recovery silver and other valuable metals, and thick gold send Gold electrolysis workshop to be electrolysed to obtain 1# ingots and synthetical recovery other noble metals after casting.The present invention has the characteristics that technological process is simple, required equipment is few, strong to adaptability to raw material, environmental pollution is small, synthetical recovery degree is high, is easily achieved industrialized production, therefore has broad application prospects.
Description
Technical field
The present invention relates to a kind of method of pyrogenic attack silver anode slime, belong to non-ferrous metal pyrometallurgy field.
Background technology
The invention belongs to fire metallurgy process.Thick silver before electrolysis, typically all containing Au, Pt, Pd and base metal Pb,
The plurality of impurities such as Cu, Bi.In electrolytic process, the electrode potential gold bigger than silver and platinum group metal will not largely dissolve and sink
Shallow lake is got off, and an electrode potential base metal impurity part smaller than silver, which can form oxide or basic salt, can also precipitate, these
Sediment just constitutes silver anode slime.The yield of silver anode slime is higher, and about 8~12%, composition is extremely complex, primary chemical
Composition be Au 40~65%, Ag 25~35%, Pd 0.5~1.0%, Pt 0. 1~0. 4%, Pb 0.04~
0.07%th, Cu 3~5%, Bi 0. 05~0.1%.So silver anode slime is the main original of extraction gold and recovery platinum palladium
Material.
At present, silver anode slime generally use chloridising in large enterprise is handled, and is soaked with hydrochloric acid and sodium chlorate
Go out, silver is entered in parting slag with AgCl, parting liquid oxalic acid or SO2Reduction obtains thick bronze, then carries out Gold electrolysis, reduces
Liquid displacement platinum, palladium afterwards.Leaching condition be present and be difficult to control, leach reagent price height in the method；Noble metal and base metal are difficult to point
It is difficult from the separation of, platinum palladium；Severe operational environment；Because the presence of chlorion requires high to equipment anticorrosion；The noble metal rate of recovery is low,
The problems such as deficiency in economic performance.Also using nitric acid dissolution method processing silver anode slime, it is mainly comprised the following steps for some small business：Silver anode
Mud → nitric acid dissolving → sulfuric acid boils gold → founding → electrolysis → proof gold.The method is in spite of noble metal loss is small, processing cost is low
The advantages that, but there is also caused sulfur dioxide, oxynitrides in handling process complexity, production process are dirty to environment simultaneously
Contaminate the shortcomings of serious.Therefore, the high-efficiency cleaning metallurgical technology for being suitable for handling silver anode slime is developed to have important practical significance.
The content of the invention
For overcome the deficiencies in the prior art, the invention provides a kind of method of pyrogenic attack silver anode slime, this method
It is small with environmental pollution, belong to clean metallurgical technology；It is strong to adaptability to raw material；Flow is simple, easy to operate；Synthetical recovery journey
Spend the advantages that high.So that the base metal and the step of noble metal one in silver anode slime are separated.
The technical scheme is that：A kind of method of pyrogenic attack silver anode slime, be by silver anode slime it is polished with
Added after sulphur, sodium carbonate dispensing from reverberatory furnace charge door and congruent melting refining is carried out in furnace chamber, now silver and copper, bismuth heavy metal are into vulcanization
The form of thing enters in silver-colored sulfonium slag, and platinum, palladium noble metal are still entered in thick gold with metallic state together with gold, so as to reach separation
Purpose；Then sulfonium slag returns to silver-colored smelting system recovery silver and other valuable metals, and thick gold send Gold electrolysis workshop to be electrolysed after casting
1# ingots and synthetical recovery other noble metals；
Main technique was included with the next stage：
1. it is milled the stage：Silver anode slime carries out ore grinding and/or grinding, sieving after drying, obtain granularity 40~80 mesh it
Between silver anode slime powder；
2. dispensing stage：Sodium carbonate, sulphur are taken, by silver anode slime：Sodium carbonate：Sulphur=100：5~15：10~20 matter
Amount is than uniformly mixing；
3. charging and the stage of reaction：The material mixed is added from reverberatory furnace charge door congruent melting refining is carried out in burner hearth, its
Reverberatory smelting technical conditions are：1000~1200 DEG C of temperature, 6~8h of smelting time；
Main chemical reactions have：
Pb + S = PbS
2Cu + S = Cu2S
2Ag + S = Ag2S
4. blowing and separation phase：Ag and Pb, Cu, Bi base metal are entered in silver-colored sulfonium slag in the form of sulfide, and Pt, Pd are expensive
Metal is still sunken to reflection furnace bottom with metallic state and entered in thick gold, so as to realize the separation of silver and base metal and noble metal；
5. the synthetical recovery stage：The silver-colored sulfonium slag of reaction gained is back to silver-colored smelting system recovery silver and base metal；Thick gold is through pouring
Cast and send after positive plate Gold electrolysis workshop to be electrolysed to obtain 1# ingots and synthetical recovery other noble metals.
Compared with the prior art, the present invention realizes that gold, platinum, palladium are expensive using sulphur as congruent melting agent in fusion process with this
The separation of metal and other valuable metals；The direct yield of gold is more than 99.5%；Producing thick golden mass percent is：Au 97~
99%；Pt 0.05~0.2%；Pd 1.0~1.5%；Ag 0.5~1.0%.The present invention has that technological process is simple, required equipment
Less, it is strong to adaptability to raw material, environmental pollution is small, synthetical recovery degree is high, is easily achieved the features such as industrialized production, therefore have
Wide application prospect.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings and with specific embodiment.
Accompanying drawing 1 represents a kind of process chart of pyrogenic attack silver anode slime.In process chart, including following rank
Section：
1. it is milled the stage：Silver anode slime is ground, sieved after drying, obtains silver sun of the granularity between 40~80 mesh
Pole mud powder；
2. dispensing stage：Soda ash, sulphur are taken, by silver anode slime：Soda ash：Sulphur=100：5~15：10~20 mass ratio
Uniformly mixing；
3. charging and the stage of reaction：The material mixed is added from reverberatory furnace charge door congruent melting refining is carried out in burner hearth, its
Reverberatory smelting technical conditions are：1000~1200 DEG C of temperature, 6~8h of smelting time；
4. blowing and separation phase：Ag and Pb, Cu, Bi base metal are entered in silver-colored sulfonium slag in the form of sulfide, and Pt, Pd are expensive
Metal is still sunken to reflection furnace bottom with metallic state and entered in thick gold, so as to realize the separation of silver and base metal and noble metal；
5. the synthetical recovery stage：The silver-colored sulfonium slag of reaction gained is back to silver-colored smelting system recovery silver and base metal；Reaction gained
Thick gold send Gold electrolysis workshop to be electrolysed after being cast into positive plate, obtains proof gold, the earth of positive pole and waste electrolyte；Proof gold obtains 1# through casting mold
Ingot；The earth of positive pole and synthetical recovery Pt, Pd noble metal；The purified return electrolysis system of waste electrolyte.
Embodiment 1
By 500 g silver anode slimes (Au 56.29%；Ag 29.68%； Pb 0.84%；Cu 3.66%) be milled 80 mesh sieves
Afterwards according to silver anode slime：Sodium carbonate：Sulphur=100：10：12 mass ratio carries out dispensing, is total to being poured into after honest material in crucible
Melting.Control condition：1200 DEG C of smelting temperature, the h of smelting time 6；Upper strata scum silica frost is pulled out after the completion of melting and obtains silver-colored sulfonium
Slag, is thick gold positioned at crucible bottom, and sampled assay obtains slightly golden composition and is：Au 98.02%；Pt 0.08%；Pd
1.07%；Ag 0.74%, golden has reclaimed rate up to 99.72%.
Embodiment 2
By 500 g silver anode slimes (Au 62.08%；Ag32.68%； Pb 0.66%；Cu 3.48%) it was milled after 80 mesh sieves
According to silver anode slime：Sodium carbonate：Sulphur=100：12：15 mass ratio carries out dispensing, and congruent melting is carried out in crucible with being poured into after honest material
Refining.Control condition：1200 DEG C of smelting temperature, the h of smelting time 8；Upper strata scum silica frost is pulled out after the completion of melting and obtains silver-colored sulfonium slag,
It is thick gold positioned at crucible bottom, sampled assay obtains slightly golden composition and is：Au 97.82%；Pt 0.09%；Pd 1.2%；
Ag 0.52%, the golden rate of recovery 99.80%.
Claims (4)
1. a kind of method of pyrogenic attack silver anode slime, it is characterized in that silver anode slime is polished with sulphur, sodium carbonate dispensing
Added afterwards from reverberatory furnace charge door and congruent melting refining is carried out in furnace chamber, now silver and copper, bismuth heavy metal enter silver in the form of sulfide
In sulfonium slag, platinum, palladium noble metal are still entered in thick gold with metallic state together with gold, so as to reach the purpose of separation；Then sulfonium slag
Return to silver-colored smelting system recovery silver and other valuable metals, thick gold send Gold electrolysis workshop to be electrolysed to obtain 1# ingots and comprehensive after casting
Close and reclaim other noble metals；Main technique was included with the next stage：
1. it is milled the stage：Silver anode slime carries out ore grinding and/or grinding, sieving after drying, obtains granularity between 40~80 mesh
Silver anode slime powder；
2. dispensing stage：Sodium carbonate, sulphur are taken, by silver anode slime：Sodium carbonate：Sulphur=100：5~15：10~20 mass ratio
Uniformly mixing；
3. charging and the stage of reaction：The material mixed is added from reverberatory furnace charge door congruent melting refining is carried out in burner hearth, it reflects
Stove melting technique condition is：1000~1200 DEG C of temperature, 6~8h of smelting time；
Main chemical reactions have：
Pb + S = PbS
2Cu + S = Cu2S
2Ag + S = Ag2S
4. blowing and separation phase：Ag and Pb, Cu, Bi base metal are entered in silver-colored sulfonium slag in the form of sulfide, Pt, Pd noble metal
Still it is sunken to reflection furnace bottom with metallic state to enter in thick gold, so as to realize the separation of silver and base metal and noble metal；
5. the synthetical recovery stage：The silver-colored sulfonium slag of reaction gained is back to silver-colored smelting system recovery silver and base metal；Thick gold is through being cast into
Gold electrolysis workshop is sent to be electrolysed to obtain 1# ingots and synthetical recovery other noble metals after positive plate.
A kind of 2. method of pyrogenic attack silver anode slime according to claim 1, it is characterised in that：Described silver anode slime
Using sulphur as congruent melting agent in fusion process, the separation of gold, platinum, palladium noble metal and other valuable metals is realized with this.
A kind of 3. method of pyrogenic attack silver anode slime according to claim 1, it is characterised in that：Described silver anode slime
During reverberatory smelting, golden direct yield is more than 99.5%.
A kind of 4. method of pyrogenic attack silver anode slime according to claim 1, it is characterised in that：Described silver anode slime
During reverberatory smelting, the mass percent for producing thick gold is：Au 97~99%；Pt 0.05~0.2%；Pd 1.0~
1.5%；Ag 0.5~1.0%；The each component sum is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610043501.7A CN105567977B (en) | 2016-01-24 | 2016-01-24 | A kind of method of pyrogenic attack silver anode slime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610043501.7A CN105567977B (en) | 2016-01-24 | 2016-01-24 | A kind of method of pyrogenic attack silver anode slime |
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| CN105567977A CN105567977A (en) | 2016-05-11 |
| CN105567977B true CN105567977B (en) | 2017-12-08 |
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| CN201610043501.7A Expired - Fee Related CN105567977B (en) | 2016-01-24 | 2016-01-24 | A kind of method of pyrogenic attack silver anode slime |
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| CN111961863B (en) * | 2020-08-27 | 2022-04-05 | 江西理工大学 | Method for removing lead from electrolytic manganese anode slime |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FI265573A (en) * | 1973-08-24 | 1975-02-25 | Outokumpu Oy | |
| CN102041393A (en) * | 2010-12-30 | 2011-05-04 | 郴州市金贵银业股份有限公司 | Silver anode mud treatment process |
| CN102703719B (en) * | 2012-07-03 | 2014-03-05 | 阳谷祥光铜业有限公司 | Technology for recovering valuable metals from noble metal slag |
| CN104451186A (en) * | 2014-12-07 | 2015-03-25 | 金川集团股份有限公司 | Method for extracting refined gold from palladium-silver-containing anode mud |
| CN104818379A (en) * | 2015-04-22 | 2015-08-05 | 柳州华锡有色设计研究院有限责任公司 | Treatment method of gold and silver pyrite |
| CN105063363B (en) * | 2015-08-31 | 2017-09-15 | 云南驰宏锌锗股份有限公司 | The method and apparatus that a kind of earth of positive pole prepares thick silver alloy |
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Effective date of registration: 20171227 Address after: 423000 Department of Biochemistry, XiangNan University, Suxian District, Chenzhou, Hunan Co-patentee after: Li Jiayuan Patentee after: XIANGNAN University Address before: 423000 Department of Biochemistry, XiangNan University, Suxian District, Chenzhou, Hunan Patentee before: Li Jiayuan |
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