CN203923411U - A kind of device of bottom liquid inlet circulation high current density electrolysis metal refining - Google Patents
A kind of device of bottom liquid inlet circulation high current density electrolysis metal refining Download PDFInfo
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- CN203923411U CN203923411U CN201420293766.9U CN201420293766U CN203923411U CN 203923411 U CN203923411 U CN 203923411U CN 201420293766 U CN201420293766 U CN 201420293766U CN 203923411 U CN203923411 U CN 203923411U
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- electrolyzer
- circulation
- negative plate
- current density
- circulation groove
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- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 title claims abstract description 18
- 238000007670 refining Methods 0.000 title claims abstract description 11
- 230000001351 cycling effect Effects 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims description 4
- 230000010287 polarization Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 150000001457 metallic cations Chemical class 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 23
- 239000008151 electrolyte solution Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 238000000151 deposition Methods 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 150000002739 metals Chemical group 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Electrolytic Production Of Metals (AREA)
Abstract
The utility model relates to a kind of device of bottom liquid inlet circulation high current density electrolysis metal refining, this device comprises electrolyzer, negative plate and positive plate, on negative plate and positive plate, be provided with current conducting rod, negative plate and positive plate are positioned in electrolyzer, bottom of electrolytic tank is provided with cycling stream feeding device, this cycling stream feeding device comprises circulation groove, solution circulated passage, recycle pump, Lower tank and header tank, between Lower tank and header tank, by extraction back extraction system, be connected, Lower tank is connected with one end of circulation groove by upflow tube, header tank is connected with the other end of circulation groove by pipeline and forms circulation.The effect that the utility model is useful: by improving catholyte circular flow, increase the travelling speed of metallic cation, thereby eliminate negative electrode concentration polarization, realize cathode efficiency higher under negative electrode high current densities and high-quality cathode product, to reach by increasing substantially current density, significantly increase the object of unit electrolyzer throughput.
Description
Technical field
The utility model relates in insoluble anode electro-deposition of metal field, is mainly a kind of device of bottom liquid inlet circulation high current density electrolysis metal refining.
Background technology
At present, traditional electrolytic deposition technology is that anode and cathode is placed in the cell body of electrolytic solution sluggish flow, under the effect of electric field, negatively charged ion anode displacement, positively charged ion is to negative electrode displacement, by controlling certain technical qualification, metal target positively charged ion obtains electrolytic deposition at negative electrode and separates out, thereby obtains high-purity electrolytic production.Because electrode reaction speed often will be faster than the velocity of diffusion of ion, thereby formed concentration polarization.In traditional Winning cell, concentration polarization just because of negative electrode, cause a small amount of foreign ion or hydrogen ion on negative electrode, to separate out together with metal target ion, cause on the one hand cathode product quality to decline, cause on the other hand cathode efficiency significantly to reduce, thereby increase energy consumption of unit product.Simultaneously, traditional electrolytic deposition technology is carried out purification or the electrolytic deposition of metal, in order to guarantee higher cathode efficiency and cathode product quality, its current density must be controlled in lower scope, thereby cause, electrolysis system is huge, facility investment expense is high, production efficiency is low.
Utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, and provide a kind of device and method of bottom liquid inlet circulation high current density electrolysis metal refining, it adopts brand-new bottom hyperchannel feed liquor cycling stream electrolytic deposition technology, realize electrolyzer electrolyte inside flow at high speed around negative electrode, to eliminate negative electrode concentration polarization, reach the object that cathode current density can significantly promote.
The purpose of this utility model completes by following technical solution, the device of this bottom liquid inlet circulation high current density electrolysis metal refining, comprise electrolyzer, negative plate and positive plate, on this negative plate and positive plate, be provided with current conducting rod, negative plate and positive plate are positioned in electrolyzer, described bottom of electrolytic tank is provided with cycling stream feeding device, this cycling stream feeding device comprises circulation groove, solution circulated passage, recycle pump, Lower tank and header tank, between Lower tank and header tank, by extraction back extraction system, be connected, Lower tank is connected with one end of circulation groove by upflow tube, header tank is connected with the other end of circulation groove by pipeline and forms circulation, in the circulation groove one end being connected with Lower tank, by pipeline, be connected with return main, return main is connected with overflow downcomer, and overflow downcomer is positioned at the outside, trough rim top of electrolyzer, in the circulation groove one end being connected with header tank, by recycle pump, pipeline, be connected with solution circulated passage, this solution circulated passage is distributed in the bottom position of negative plate, on solution circulated passage, be provided with the pipe nozzle of different pore size, this pipe nozzle is just toward the bottom of every negative plate.
As preferably, described solution circulated channel setting is in the negative plate bottom of electrolyzer, solution circulated passage be shaped as circular or polygonal tubulose.
The utility model adopts the implementation method of bottom liquid inlet circulation high current density electrolysis metal refining device described above, comprises the steps:
1: heating electrolytic solution, making temperature is 20-80 ℃, and under the condition that concentration of metal ions is 20-80g/L in electrolytic solution, ON cycle flows to the recycle pump 53 in liquid device 5, and catholyte is in the interior self-circulation of electrolyzer 1; The electrolytic solution overflowing in described electrolyzer 1 flows into circulation groove 51 by overflow downcomer 59 through return main 58, the collected electrolytic solution of circulation groove 51 flows into header tank 55 by upflow tube 57 after Lower tank 54 is processed by extraction back extraction system 56, and the electrolytic solution of header tank 55 flows into circulation groove 51;
2: catholyte sprays into negative plate 2 surfaces by even, the large flow of pipe nozzle 521 on solution circulated passage 52, makes the catholyte circular flow in metal ion electrolyting precipitation process reach 150-3000m
3/ Mt, current density reaches 300-600A/m
2, its cathode efficiency reaches more than 95%;
3: after electrolysis 3-5 days, take out cathode product.
The beneficial effects of the utility model are: can be under the constant condition of traditional electrolysis recess gauge lattice, by increasing substantially cathode current density, the specific productivity of electrolyzer is improved significantly, and cathode efficiency still reaches more than 96%, cathode product quality is not subject to the impact of high current density, is the modern technique of clean, efficient a, environmental protection; This technology is different from high current density parallel-flow electrolysis tech, parallel-flow electrolysis tech adopts negative electrode sidepiece feed liquor mode, sidepiece feed liquor mode is applicable to soluble anode electrorefining technique, its advantage is can avoid stirring because of the anode sludge problem that affects cathode product quality, but its shortcoming be electrolytic solution at cathode surface skewness, liquid stream effect is bad; And in insoluble anode electro-deposition of metal technique, owing to not having a large amount of anode sludge to produce, therefore can realize bottom liquid inlet mode, which electrolytic solution is evenly distributed, and eliminates negative electrode concentration polarization effective.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of cycling stream feeding device of the present utility model in electrolyzer.
Fig. 2 is the plan structure schematic diagram of cycling stream feeding device of the present utility model in electrolyzer.
Fig. 3 is the side-looking structural representation of cycling stream feeding device of the present utility model in electrolyzer.
Fig. 4 is cycling stream feeding device arrangement schematic diagram of the present utility model.
Label in accompanying drawing is respectively: 1, electrolyzer; 2, negative plate; 3, positive plate; 4, current conducting rod; 5, cycling stream feeding device; 51, circulation groove; 52, solution circulated passage; 53, recycle pump; 54, Lower tank; 55, header tank; 56, extraction back extraction system; 57, upflow tube; 58, return main; 59, overflow downcomer; 521, pipe nozzle.
Embodiment
Below in conjunction with drawings and Examples, the utility model is done to detailed introduction:
As shown in accompanying drawing 1 to 4, the device of this bottom liquid inlet circulation high current density electrolysis metal refining, comprise electrolyzer 1, negative plate 2 and positive plate 3, on this negative plate 2 and positive plate 3, be provided with current conducting rod 4, negative plate 2 and positive plate 3 are positioned in electrolyzer 1, it is characterized in that: described electrolyzer 1 bottom is provided with cycling stream feeding device 5, this cycling stream feeding device 5 comprises circulation groove 51, solution circulated passage 52, recycle pump 53, Lower tank 54 and header tank 55, Lower tank 54 is connected by extraction back extraction system 56 with 55 of header tanks, Lower tank 54 is connected with one end of circulation groove 51 by upflow tube 57, header tank 55 is connected with the other end of circulation groove 51 by pipeline and forms circulation, in circulation groove 51 one end that are connected with Lower tank 54, by pipeline, be connected with return main 58, return main 58 is connected with overflow downcomer 59, and overflow downcomer 59 is positioned at the outside, trough rim top of electrolyzer 1, in circulation groove 51 one end that are connected with header tank 55, by recycle pump 53, pipeline, be connected with solution circulated passage 52, this solution circulated passage 52 is distributed in the bottom position of negative plate 2, on solution circulated passage 52, be provided with the pipe nozzle 521 of different pore size, this pipe nozzle 521 is just toward the bottom of every negative plate 2.Described solution circulated passage 52 is arranged on negative plate 2 bottoms of electrolyzer 1, solution circulated passage 52 be shaped as circular or polygonal tubulose.
The implementation method of this bottom liquid inlet circulation high current density electrolysis metal refining device of the present utility model, comprises the steps:
1: heating electrolytic solution, making temperature is 20-80 ℃, and under the condition that concentration of metal ions is 20-80g/L in electrolytic solution, ON cycle flows to the recycle pump 53 in liquid device 5, and catholyte is in the interior self-circulation of electrolyzer 1; The electrolytic solution overflowing in described electrolyzer 1 flows into circulation groove 51 by overflow downcomer 59 through return main 58, the collected electrolytic solution of circulation groove 51 flows into header tank 55 by upflow tube 57 after Lower tank 54 is processed by extraction back extraction system 56, and the electrolytic solution of header tank 55 flows into circulation groove 51.
2: catholyte sprays into negative plate 2 surfaces by even, the large flow of pipe nozzle 521 on solution circulated passage 52, makes the catholyte circular flow in metal ion electrolyting precipitation process reach 150-3000m
3/ Mt, current density reaches 300-600A/m
2, its cathode efficiency reaches more than 95%;
3: after electrolysis 3-5 days, take out cathode product.
Electrolyzer of the present utility model 1 bottom is provided with cycling stream feeding device 5, solution circulated passage 52 in this cycling stream feeding device 5 is distributed in the bottom of negative plate 2, on solution circulated passage 52, be provided with the pipe nozzle 521 of different pore size, realize flowing in order of solution; This pipe nozzle 521 is just toward negative plate 2, and the bottom of every negative plate 2 is all furnished with pipe nozzle 521; Described solution circulated passage 52 arranges and has one at least in negative plate 2 bottoms of electrolyzer 1, realizes the large flow of electrolyzer 1 inner cathode liquid and circulates; Solution circulated passage 52 be shaped as circular or polygonal tubulose.By the cycling stream feeding device 5 of design electrolyzer 1 bottom, even, the large flow of electrolytic solution is sprayed into negative plate surface, make solution in cathode surface forced-flow, thereby alleviate negative electrode concentration polarization phenomenon, cathode current density can significantly be promoted.In electrolyzer, catholyte circular flow is by 20-50m
3/ Mt brings up to 150-3000m
3/ Mt, cathode current density can be by 150-300A/m
2bring up to 300-600A/m
2, cathode efficiency reaches more than 95%, and each electrolyzer Metal Production ability improves 50%-150%, and the impact that quality product is not promoted by cathode current density.
Method of the present utility model, adopt high current density insoluble anode electrolytic deposition technology to carry out nickel, cobalt, manganese, gold, the electrolytic deposition of the metals such as silver extracts and purifies, by hyperchannel feed liquor cycling stream device is installed at bottom of electrolytic tank, improve catholyte circular flow, increase the travelling speed of metallic cation, thereby eliminate negative electrode concentration polarization, realize cathode efficiency higher under negative electrode high current densities and high-quality cathode product, to reach by increasing substantially current density, significantly increase the object of unit electrolyzer throughput, when realization significantly reduces the investment of electrorefining system, effectively reduce production run expense.
Embodiment mono-:
Copper-bath is heated to 20-60 ℃, add sulfuric acid to 100-180g/L, ON cycle flows to the recycle pump 53 in liquid device 5, makes catholyte in the interior self-circulation of electrolyzer 1, and forms cycling stream on every negative plate 2 surfaces.When catholyte self-circulation flow reaches 1500m
3/ Mt, is promoted to 350A/m by cathode current density
2, electrolysis, after 4 days, is taken out cathode product, and its cathode efficiency reaches 96%, and single groove cathode product output is 200A/m compared with current density
2shi Tigao 75%.
Embodiment bis-:
Copper-bath is heated to 20-60 ℃, add sulfuric acid to 100-180g/L, ON cycle flows to the recycle pump 53 in liquid device 5, makes catholyte in the interior self-circulation of electrolyzer 1, and forms cycling stream on every negative plate 2 surfaces.When catholyte self-circulation flow reaches 1200m
3/ Mt, is promoted to 300A/m by cathode current density
2, electrolysis, after 4 days, is taken out cathode product, and its cathode efficiency reaches 98%, and single groove cathode product output is 200A/m compared with current density
2shi Tigao 50%.
Embodiment tri-:
Copper-bath is heated to 20-60 ℃, add sulfuric acid to 100-180g/L, ON cycle flows to the recycle pump 53 in liquid device 5, makes catholyte in the interior self-circulation of electrolyzer 1, and forms cycling stream on every negative plate 2 surfaces.When catholyte self-circulation flow reaches 1800m
3/ Mt, is promoted to 400A/m by cathode current density
2, electrolysis, after 4 days, is taken out cathode product, and its cathode efficiency reaches 95.5%, and single groove cathode product output is 200A/m compared with current density
2shi Tigao 100%.
Embodiment tetra-:
Copper-bath is heated to 20-60 ℃, add sulfuric acid to 100-180g/L, ON cycle flows to the recycle pump 53 in liquid device 5, makes catholyte in the interior self-circulation of electrolyzer 1, and forms cycling stream on every negative plate 2 surfaces.When catholyte self-circulation flow reaches 2000m
3/ Mt, is promoted to 450A/m by cathode current density
2, electrolysis, after 4 days, is taken out cathode product, and its cathode efficiency reaches 95%, and single groove cathode product output is 200A/m compared with current density
2shi Tigao 125%.
Be understandable that, for a person skilled in the art, to the technical solution of the utility model and utility model, design is equal to replace or change and all should be belonged to the protection domain of the appended claim of the utility model.
Claims (2)
1. the device of a bottom liquid inlet circulation high current density electrolysis metal refining, comprise electrolyzer (1), negative plate (2) and positive plate (3), on this negative plate (2) and positive plate (3), be provided with current conducting rod (4), negative plate (2) and positive plate (3) are positioned in electrolyzer (1), it is characterized in that: described electrolyzer (1) bottom is provided with cycling stream feeding device (5), this cycling stream feeding device (5) comprises circulation groove (51), solution circulated passage (52), recycle pump (53), Lower tank (54) and header tank (55), between Lower tank (54) and header tank (55), by extraction back extraction system (56), be connected, Lower tank (54) is connected with one end of circulation groove (51) by upflow tube (57), header tank (55) is connected with the other end of circulation groove (51) by pipeline and forms circulation, in circulation groove (51) one end being connected with Lower tank (54), by pipeline, be connected with return main (58), return main (58) is connected with overflow downcomer (59), and overflow downcomer (59) is positioned at the outside, trough rim top of electrolyzer (1), in circulation groove (51) one end being connected with header tank (55), by recycle pump (53), pipeline, be connected with solution circulated passage (52), this solution circulated passage (52) is distributed in the bottom position of negative plate (2), on solution circulated passage (52), be provided with the pipe nozzle (521) of different pore size, this pipe nozzle (521) is just toward the bottom of every negative plate (2).
2. the device of bottom liquid inlet circulation high current density electrolysis metal refining according to claim 1, it is characterized in that: described solution circulated passage (52) is arranged on negative plate (2) bottom of electrolyzer (1), solution circulated passage (52) be shaped as circular or polygonal tubulose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293766.9U CN203923411U (en) | 2014-06-04 | 2014-06-04 | A kind of device of bottom liquid inlet circulation high current density electrolysis metal refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293766.9U CN203923411U (en) | 2014-06-04 | 2014-06-04 | A kind of device of bottom liquid inlet circulation high current density electrolysis metal refining |
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| Publication Number | Publication Date |
|---|---|
| CN203923411U true CN203923411U (en) | 2014-11-05 |
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| CN201420293766.9U Expired - Lifetime CN203923411U (en) | 2014-06-04 | 2014-06-04 | A kind of device of bottom liquid inlet circulation high current density electrolysis metal refining |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032332A (en) * | 2014-06-04 | 2014-09-10 | 杭州三耐环保科技有限公司 | High-current density metal electrolytic deposition device with bottom inlet liquid circulation and realization method thereof |
| CN104775132A (en) * | 2015-03-27 | 2015-07-15 | 张家港联合铜业有限公司 | Trapezoidal flow electrodeposition apparatus |
| CN105154923A (en) * | 2015-10-21 | 2015-12-16 | 五矿铜业(湖南)有限公司 | Electrolytic tank device |
| CN110923745A (en) * | 2019-12-27 | 2020-03-27 | 昆明理工大学 | Device and method for electrochemically synthesizing stannous octoate by jet stirring |
| CN113279023A (en) * | 2021-05-28 | 2021-08-20 | 金川集团股份有限公司 | Circular purification impurity removal kettle for metal solution purification and impurity removal method |
-
2014
- 2014-06-04 CN CN201420293766.9U patent/CN203923411U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032332A (en) * | 2014-06-04 | 2014-09-10 | 杭州三耐环保科技有限公司 | High-current density metal electrolytic deposition device with bottom inlet liquid circulation and realization method thereof |
| CN104032332B (en) * | 2014-06-04 | 2016-05-25 | 杭州三耐环保科技有限公司 | A kind of device and implementation method of bottom liquid inlet circulation high current density electrolysis plated metal |
| CN104775132A (en) * | 2015-03-27 | 2015-07-15 | 张家港联合铜业有限公司 | Trapezoidal flow electrodeposition apparatus |
| CN105154923A (en) * | 2015-10-21 | 2015-12-16 | 五矿铜业(湖南)有限公司 | Electrolytic tank device |
| CN110923745A (en) * | 2019-12-27 | 2020-03-27 | 昆明理工大学 | Device and method for electrochemically synthesizing stannous octoate by jet stirring |
| CN113279023A (en) * | 2021-05-28 | 2021-08-20 | 金川集团股份有限公司 | Circular purification impurity removal kettle for metal solution purification and impurity removal method |
| CN113279023B (en) * | 2021-05-28 | 2023-05-26 | 金川集团股份有限公司 | Circulation purifying and impurity removing kettle for purifying metal solution and impurity removing method |
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| GR01 | Patent grant | ||
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Address after: Hangzhou City, Zhejiang province 310004 city of Shaoxing Road No. 337, the modern building room 1115 Patentee after: HANGZHOU SANNAL ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Address before: 311607, No. 929, Xin'An River Road, Yangxi street, Jiande, Zhejiang, Hangzhou Patentee before: Hangzhou Sannai Environmental Protection Technology Co., Ltd. |