CN116676643A - Method for improving electrolytic stripping state of zinc - Google Patents
Method for improving electrolytic stripping state of zinc Download PDFInfo
- Publication number
- CN116676643A CN116676643A CN202310569135.9A CN202310569135A CN116676643A CN 116676643 A CN116676643 A CN 116676643A CN 202310569135 A CN202310569135 A CN 202310569135A CN 116676643 A CN116676643 A CN 116676643A
- Authority
- CN
- China
- Prior art keywords
- zinc
- cathode
- aluminum plate
- plate
- potassium permanganate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011701 zinc Substances 0.000 title claims abstract description 116
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 96
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 96
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 claims abstract description 25
- 238000005201 scrubbing Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000004070 electrodeposition Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims description 20
- 238000005868 electrolysis reaction Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000002378 acidificating effect Effects 0.000 description 10
- 238000005363 electrowinning Methods 0.000 description 10
- 230000001680 brushing effect Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- 208000037805 labour Diseases 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical group [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- SZOADBKOANDULT-UHFFFAOYSA-K antimonous acid Chemical compound O[Sb](O)O SZOADBKOANDULT-UHFFFAOYSA-K 0.000 description 1
- 229940026189 antimony potassium tartrate Drugs 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- WBTCZEPSIIFINA-MSFWTACDSA-J dipotassium;antimony(3+);(2r,3r)-2,3-dioxidobutanedioate;trihydrate Chemical compound O.O.O.[K+].[K+].[Sb+3].[Sb+3].[O-]C(=O)[C@H]([O-])[C@@H]([O-])C([O-])=O.[O-]C(=O)[C@H]([O-])[C@@H]([O-])C([O-])=O WBTCZEPSIIFINA-MSFWTACDSA-J 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 fluoride ions Chemical class 0.000 description 1
- 239000012213 gelatinous substance Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/06—Operating or servicing
- C25C7/08—Separating of deposited metals from the cathode
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/16—Electrolytic production, recovery or refining of metals by electrolysis of solutions of zinc, cadmium or mercury
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
The invention relates to a method for improving the electrolytic stripping condition of zinc, which belongs to the technical field of electrolytic zinc and comprises the following steps: s1, taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine or manual stripping, and conveying the cathode zinc sheet to a casting ingot; s2, adding potassium permanganate into flushing water to form potassium permanganate solution, conveying the cathode aluminum plate obtained in the step S1 to a scrubber to scrub with the potassium permanganate solution, and loading the cathode aluminum plate into an electrolytic tank for electrodeposition after scrubbing, and recycling the used flushing water for reuse or directly discharging. The invention can solve the problem of difficult stripping, protect the cathode aluminum plate from being damaged, prolong the service life of the cathode aluminum plate, protect the surface of the cathode aluminum plate, avoid a great deal of labor force for manually treating the residual zinc plate, avoid uneven surface of the cathode caused by the damage of the surface of the cathode plate due to the manual treatment of the residual zinc plate, improve the zinc stripping efficiency, shorten the electrolysis period and be beneficial to improving the electrolysis current efficiency.
Description
Technical Field
The invention belongs to the technical field of electrolytic zinc, and particularly relates to a method for improving electrolytic stripping condition of zinc.
Background
The main reason for the difficulty in stripping zinc sheets is that fluoride ions and the like in the electrolyte can damage an aluminum oxide film on the surface of a cathode aluminum plate, so that zinc precipitated and the fresh surface of the aluminum plate form zinc-aluminum alloy, and zinc-aluminum adhesion occurs, so that zinc is difficult to strip. At present, the situation of difficult stripping often occurs in the electrolytic production process, when the stripping of zinc is difficult, the speed of a groove is rapidly reduced, the yield of zinc sheets is greatly reduced, the electrolytic current efficiency is reduced, the direct current consumption of zinc electrolysis is increased, the residual zinc sheets entering the groove are greatly increased, the brush wheel is damaged to form vicious circle, the stripping is further more difficult, and the current efficiency is continuously reduced; in addition, the residual zinc plate can be reused only after the residual zinc is treated by a fluid bath or a person, and because the fluid bath has limited treatment capacity, when the quantity of the residual zinc plates is relatively large, a large quantity of residual zinc plates which are difficult to treat are accumulated, and when the residual zinc plates are replaced, the investment for repairing the cathode aluminum plate or the new cathode aluminum plate is increased, so that the maintenance period of the repairing plate is shortened, the repairing quality is deteriorated, the residual zinc plate is changed after the investment, and thus the unit consumption of the cathode plate is high; in addition, when the solution returning groove cannot meet the production requirement, organization personnel are required to process the residual zinc plate, so that the labor intensity is improved, an iron device such as a zinc stripping knife is required to be used for beating in the process of processing the residual zinc plate, the surface and other parts of the cathode aluminum plate are damaged to a great extent, and the current efficiency and the service life of the cathode aluminum plate are reduced again.
The surface of the cathode aluminum plate is brushed by using a mechanical brush, a manual brush or other modes in the plate brushing process, the cathode aluminum plate leaks out of the fresh aluminum surface after the plate brushing, and oxidation reaction can occur between the fresh aluminum and air in the plate brushing process:
4Al+3O 2 ＝＝2Al 2 O 3
the reaction is naturally reacted, the reaction process is insufficient, any unoxidized gaps exist on the surface of the cathode, and a plurality of phenomena that the generated zinc-aluminum alloy is difficult to strip after the cathode plate is put into the groove still exist.
In order to improve the stripping condition, the conventional method adds antimony potassium tartrate into the electrolyte, and can carry out the following reaction:
K(SbO)C 2 H 4 O 6 +H 2 SO 4 +H 2 O→Sb(OH) 3 +H 2 C 4 O 6 +KHSO 4
the antimony hydroxide gelatinous substance generated after the reaction is slightly electropositive and is attached to the surface of the cathode aluminum plate, so that when zinc is separated out, aluminum zinc alloy is prevented from forming with the fresh surface of the aluminum plate. Too much material is added in the actual operation process, so that the burning plate is caused, the addition is too little, the effect is not obvious, the labor intensity of manual operation is high, and the addition amount is not accurate enough.
Disclosure of Invention
In order to overcome the problems in the background technology, the invention provides a method for improving the stripping condition of zinc electrolysis, which can solve the problem of difficult stripping, protect the cathode aluminum plate from being damaged, prolong the service life of the cathode aluminum plate and reduce the unit consumption of the cathode aluminum plate. And protect cathode aluminum plate surface, avoid a large amount of labours of manual treatment incomplete zinc plate, the negative plate surface damage that causes because of the incomplete zinc plate of manual treatment causes does not lead to the fact the negative pole surface unevenness, to a great extent improves and peels zinc efficiency, shortens electrolysis cycle, is favorable to promoting electrolysis current efficiency.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the method for improving the electrolytic stripping state of zinc comprises the following steps:
s1, taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine or manual stripping, and conveying the cathode zinc sheet to a casting ingot;
s2, adding potassium permanganate into flushing water to form potassium permanganate solution, conveying the cathode aluminum plate obtained in the step S1 to a scrubber to scrub with the potassium permanganate solution, and loading the cathode aluminum plate into an electrolytic tank for electrodeposition after scrubbing, and recycling the used flushing water for reuse or directly discharging.
Further, the concentration of the potassium permanganate solution in the step S2 is determined according to the F content of the electrolyte in the electrolytic tank, and when the F content in the electrolyte is less than 70mg/L, the concentration of the potassium permanganate solution is 0.001g/L to 0.01g/L; when the F content in the electrolyte is more than or equal to 70mg/L, the concentration of the potassium permanganate solution is more than 0.002g/L.
Further, the temperature of the potassium permanganate solution in the step S2 is more than or equal to 5 ℃.
Further, the cathode aluminum plate in the step S2 is heated to 40-100 ℃.
After the cathode plate is scrubbed, a natural oxide film layer is generated in the air due to the great chemical activity of aluminum, but the natural oxide film layer is aluminum hydrate, the film layer is thinner, the structural change is great, and the cathode plate is easy to damage. The acidic potassium permanganate has very strong oxidizing property, can also react with aluminum quickly, and generates compact alumina with extremely stable and hard oxide film by a chemical oxidation method, so that the alumina with the form does not react with acid or alkali, and can not be basically destroyed so as to protect a cathode plate from being bonded with precipitated zinc, and the stripping is easier.
The brushing water for brushing the cathode plate is acidic in the zinc stripping process, and KMnO is added into the brushing water 4 The acidic potassium permanganate in the brushing water in the brushing process contacts with the cathode plate, so that the cathode plate can rapidly generate an oxide film to be passivated to achieve the aim of protection. In addition, the electrolytic environment itself continuously generates high valence manganese in the electrolytic process, and the residual reaction between the cathode plate brushing process and the aluminum plateTrace KMnO 4 Even if the electrolyte is carried into the electrolytic tank through the cathode plate, the normal production of the electrolyte is not affected.
The reaction equation: 10Al+6MnO 4 - +18H + ＝5Al 2 O 3 +6Mn 2+ +9H 2 O
The compact oxide film covers the surface of the cathode aluminum plate after the reaction to protect the cathode from corrosion, so that precipitated cathode zinc does not form alloy with the cathode aluminum plate, the stripping condition is greatly improved, the number of residual zinc plates is reduced, the service life of the cathode plate is prolonged, the unit consumption of the cathode plate is reduced, and Mn is reduced 2+ The system is brought into the system to just replenish depleted manganese ions in the system.
The invention has the beneficial effects that:
1. the invention has the advantages that the cathode aluminum plate is taken out from the electrolytic tank and carries acid, and the acid can be carried into water in the process of washing the cathode plate or soaking, so that the washing water is acidic. KMnO prior to rinsing 4 The acidic potassium permanganate exists in the water after the acidic potassium permanganate is added into flushing water, and the surface of the cathode aluminum is rapidly oxidized by double oxidation of the acidic potassium permanganate and oxygen in the flushing or soaking process, so that the surface of the cathode plate is completely wrapped by aluminum oxide or unoxidized pores are reduced to the greatest extent, and the corrosion resistance of the cathode aluminum plate is improved. The surface of the cathode aluminum plate wrapped by aluminum oxide is difficult to corrode in the zinc electrowinning process, zinc-aluminum alloy is not generated, and when the cathode plate with zinc is taken out after the electrowinning is finished, a zinc sheet can be easily separated from the cathode aluminum plate. The problem of difficult stripping is well solved, the cathode aluminum plate is protected from being damaged, the service life of the cathode aluminum plate is prolonged, and the unit consumption of the cathode aluminum plate is reduced.
2. The invention can well solve the problem of difficult stripping, protect the cathode aluminum plate from being damaged, prolong the service life of the cathode aluminum plate and reduce the unit consumption of the cathode aluminum plate.
3. The invention can well protect the surface of the cathode aluminum plate, can avoid a great deal of labor force for manually treating the residual zinc plate, does not cause uneven surface of the cathode due to the damage of the surface of the cathode plate caused by the manual treatment of the residual zinc plate, greatly improves the zinc stripping efficiency, shortens the electrolysis period and is beneficial to improving the electrolysis current efficiency.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to facilitate understanding of the skilled person.
The method for improving the electrolytic stripping state of zinc comprises the following steps:
s1, taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine or manual stripping, and conveying the cathode zinc sheet to a casting ingot;
s2, adding potassium permanganate into flushing water to form a potassium permanganate solution, wherein the concentration of the potassium permanganate solution is determined according to the F content of electrolyte in the electrolytic tank, and when the F content in the electrolyte is less than 70mg/L, the concentration of the potassium permanganate solution is 0.001 g/L-0.01 g/L; when the F content in the electrolyte is more than or equal to 70mg/L, the concentration of the potassium permanganate solution is more than 0.002g/L. And (2) conveying the cathode aluminum plate obtained in the step (S1) to a scrubber for scrubbing by using a potassium permanganate solution, wherein the temperature of the potassium permanganate solution is more than or equal to 5 ℃, the cathode aluminum plate is required to be heated to 40-100 ℃, and after scrubbing, the cathode aluminum plate is put into an electrolytic tank for electrodeposition, and the used flushing water is recycled for reuse or is directly discharged for treatment.
The invention provides a new method for double oxidation of the surface of a cathode plate, thereby avoiding the non-oxidized pores on the surface of the cathode aluminum plate and thoroughly changing the phenomenon that zinc adheres to the cathode aluminum plate.
In this method, the cathode aluminum plate is taken out of the electrolytic tank and then carries acid, and the acid can be carried into water during the process of washing the cathode plate or soaking, so that the washing water is acidic. Before flushing, KMnO4 is added into flushing water, acidic potassium permanganate exists in the flushing process water, and the surface of cathode aluminum is rapidly oxidized by double oxidation of the acidic potassium permanganate and oxygen in the flushing or soaking process, so that the surface of the cathode plate is completely wrapped by aluminum oxide or unoxidized pores are reduced to the greatest extent, and the corrosion resistance of the cathode aluminum plate is improved. The surface of the cathode aluminum plate wrapped by aluminum oxide is difficult to corrode in the zinc electrowinning process, zinc-aluminum alloy is not generated, and when the cathode plate with zinc is taken out after the electrowinning is finished, a zinc sheet can be easily separated from the cathode aluminum plate.
Example 1
Taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine, and conveying the cathode zinc sheet to a casting ingot; the electrolyte content in the electrolytic tank is detected to be 68mg/L, potassium permanganate is added into flushing water to form potassium permanganate solution with the concentration of 0.001g/L, a cathode aluminum plate is sent to a scrubber to be scrubbed by the potassium permanganate solution, the temperature of the potassium permanganate solution is 5 ℃, the cathode aluminum plate is heated to 40 ℃, the cathode aluminum plate is put into the electrolytic tank to be electrodeposited after the scrubbing is finished, and the used flushing water is recycled for reuse or is directly discharged for treatment. After the electrowinning is finished, the cathode plate with zinc is taken out, and a zinc stripping knife is used for stripping the zinc sheet from the cathode aluminum plate.
Comparative example 1
Taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine, and conveying the cathode zinc sheet to a casting ingot; the F content of the electrolyte in the electrolytic tank is detected to be 68mg/L, the cathode aluminum plate is sent to a scrubber and scrubbed by living water, the temperature of the living water is 5 ℃, the cathode aluminum plate is heated to 40 ℃, the cathode aluminum plate is put into the electrolytic tank for electrodeposition after the scrubbing is finished, and the used flushing water is recycled for reuse or is directly discharged for treatment. And after the electrowinning is finished, the cathode plate with zinc is taken out and stripped by using a zinc stripping knife, the whole zinc sheet is adhered to the cathode aluminum plate, and the zinc sheet is torn and cannot be separated from the cathode aluminum plate.
Example 2
Taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using manual stripping, and conveying the cathode zinc sheet to a casting ingot; when the F content of the electrolyte in the electrolytic tank is detected to be 81mg/L, potassium permanganate is added into flushing water to form potassium permanganate solution with the concentration of 0.005g/L, a cathode aluminum plate is sent to a scrubber to be scrubbed by the potassium permanganate solution, the potassium permanganate solution is heated to 40 ℃, the cathode aluminum plate is put into the electrolytic tank to be electrodeposited after the scrubbing is finished, and the used flushing water is recycled for reuse or is directly discharged for treatment. After the electrowinning is finished, the cathode plate with zinc is taken out, the zinc sheet can be rapidly stripped from the cathode aluminum plate by using a zinc stripping machine, and the whole sheet has better integrity.
Comparative example 2
Taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using manual stripping, and conveying the cathode zinc sheet to a casting ingot; when the F content of the electrolyte in the electrolytic tank is detected to be 81mg/L, the cathode aluminum plate is sent to a scrubber for scrubbing by using living water, the living water is heated to 40 ℃, the cathode aluminum plate is put into the electrolytic tank for electrodeposition after the scrubbing is finished, and the used flushing water is recycled for reuse or is directly discharged for treatment. And after the electrowinning is finished, the cathode plate with zinc is taken out and stripped by using a zinc stripping knife, part of zinc sheets are adhered to the cathode aluminum plate, and the zinc sheets are torn and broken, so that the zinc sheets are difficult to separate from the cathode aluminum plate.
Example 3
Taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine, and conveying the cathode zinc sheet to a casting ingot; detecting that the F content of electrolyte in the electrolytic tank is 150mg/L, adding potassium permanganate into flushing water to form potassium permanganate solution with the concentration of 0.009g/L, sending a cathode aluminum plate to a scrubber to scrub with the potassium permanganate solution, heating the potassium permanganate solution to 60 ℃, heating the cathode aluminum plate to 80 ℃, loading the cathode aluminum plate into the electrolytic tank for electrodeposition after the scrubbing is finished, and recycling the used flushing water for reuse or directly discharging. After the electrowinning is finished, the cathode plate with zinc is taken out, the zinc sheet can be rapidly stripped from the cathode aluminum plate by using a zinc stripping machine, and the whole sheet has better integrity.
Comparative example 3
Taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine, and conveying the cathode zinc sheet to a casting ingot; detecting that the F content of electrolyte in the electrolytic tank is 150mg/L, sending the cathode aluminum plate to a scrubber to scrub with living water, heating the living water to 60 ℃, heating the cathode aluminum plate to 80 ℃, loading the cathode aluminum plate into the electrolytic tank for electrodeposition after scrubbing, and recovering the used flushing water for reuse or directly discharging the flushing water. And after the electrowinning is finished, the cathode plate with zinc is taken out and stripped by using a zinc stripping knife, part of zinc sheets are adhered to the cathode aluminum plate, and the zinc sheets are torn and broken, so that the zinc sheets are difficult to separate from the cathode aluminum plate.
Experimental analysis
The technical scheme of the invention is not used, the back surface of the cathode plate is normally in a grey color, and when the technical scheme of the invention is used, the surface of the cathode plate which is brushed is covered with a yellowish or purple yellow film; the corrosion resistance of the surface film is detected by using a primary cell principle through a test, an aluminum plate and a copper wire are lapped and immersed in a sulfuric acid solution of 150g/L, the corrosion condition is observed, the time is recorded, and when bubbles are observed in the solution, the reaction is proved to start to occur, and the timing is stopped. The specific test data are as follows:
the pH of the rinse water used to rinse the cathode aluminum plate in the above experiment was 1-7.
From experimental data, the surface oxidation degree of the cathode aluminum plate can be accelerated when the cathode aluminum plate is heated, and the effect of protecting the cathode aluminum plate is achieved; however, the effect is improved after the potassium permanganate is added, and the potassium permanganate solution flushing water and the cathode aluminum plate are heated at the same time, so that the corrosion resistance degree of the surface of the cathode aluminum plate is optimal.
In production practice, F fluctuation occurs in electrolyte, F content is rapidly increased, zinc stripping is difficult, an electrolysis period is prolonged, an interelectrode short circuit phenomenon is obvious, an electrolytic tank is serious in heating, unit consumption of a cathode plate is rapidly increased from normal 0.02 block/t.Zn to more than 0.2 block/t.Zn, current efficiency is reduced from 90% -92% to 80% or lower, and the number of zinc plates is reduced from 2000 blocks/month to 4000 blocks/month to more than 20000 blocks/month.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (4)
1. A method for improving the electrolytic stripping condition of zinc, which is characterized in that: the method for improving the electrolytic stripping state of zinc specifically comprises the following steps:
s1, taking out the electrolyzed cathode plate with zinc, separating a cathode zinc sheet from a cathode aluminum plate by using a zinc stripping machine or manual stripping, and conveying the cathode zinc sheet to a casting ingot;
s2, adding potassium permanganate into flushing water to form potassium permanganate solution, conveying the cathode aluminum plate obtained in the step S1 to a scrubber to scrub with the potassium permanganate solution, and loading the cathode aluminum plate into an electrolytic tank for electrodeposition after scrubbing, and recycling the used flushing water for reuse or directly discharging.
2. A method for improving the electrolytic stripping condition of zinc according to claim 1, characterized in that: the concentration of the potassium permanganate solution in the step S2 is determined according to the F content of the electrolyte in the electrolytic tank, and when the F content in the electrolyte is less than 70mg/L, the concentration of the potassium permanganate solution is 0.001 g/L-0.01 g/L; when the F content in the electrolyte is more than or equal to 70mg/L, the concentration of the potassium permanganate solution is more than 0.002g/L.
3. A method for improving the electrolytic stripping condition of zinc according to claim 1, characterized in that: in the step S2, the temperature of the potassium permanganate solution is more than or equal to 5 ℃.
4. A method for improving the electrolytic stripping condition of zinc according to claim 1, characterized in that: in the step S2, the cathode aluminum plate is heated to 40-100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310569135.9A CN116676643A (en) | 2023-05-19 | 2023-05-19 | Method for improving electrolytic stripping state of zinc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310569135.9A CN116676643A (en) | 2023-05-19 | 2023-05-19 | Method for improving electrolytic stripping state of zinc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116676643A true CN116676643A (en) | 2023-09-01 |
Family
ID=87777887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310569135.9A Pending CN116676643A (en) | 2023-05-19 | 2023-05-19 | Method for improving electrolytic stripping state of zinc |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116676643A (en) |
-
2023
- 2023-05-19 CN CN202310569135.9A patent/CN116676643A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107889511B (en) | Closed loop system and method for recycling lead acid batteries | |
| US9702044B2 (en) | Method for regenerating plating liquid, plating method, and plating apparatus | |
| CN104120460B (en) | A kind of method removing electrolytic copper foil Ni-Ti anode surface scale | |
| CN103290464B (en) | A kind of electrochemistry removing plating method of stainless steel black film | |
| JP6604466B2 (en) | Copper manufacturing method and copper manufacturing apparatus | |
| CN102268699B (en) | Method for removing anode slime of porous anode | |
| CN1451058A (en) | Continuous electrolytic pickling method for metallic products using alternate current suplied cells | |
| CA2027656C (en) | Galvanic dezincing of galvanized steel | |
| JP4465685B2 (en) | Insoluble electrode recovery method | |
| CN116676643A (en) | Method for improving electrolytic stripping state of zinc | |
| CN111349961B (en) | Method for cleaning waste titanium anode plate for foil forming machine and removing and recycling precious metal | |
| JP5651252B2 (en) | Method for peeling coating layer of electrode for electrolysis | |
| CA3065072A1 (en) | Blasting process for lead anode plates for electro-obtaining zinc | |
| CN114540824B (en) | Method for regenerating titanium anode plate by using waste acid solution | |
| JPH1018073A (en) | Electrolysis with addition of ultrasonic vibration | |
| CN107267966A (en) | A kind of continuous chrome-plated process of pin cloth | |
| CN1670264A (en) | Descaling of stainless steel and device therefor | |
| JP4102526B2 (en) | Copper chloride etchant electrolytic regeneration system | |
| CN113881967B (en) | Impurity removal method for lead electrolyte | |
| JP5115936B2 (en) | Method for collecting insoluble metal electrode | |
| US1281857A (en) | Process for recovery battery fluids. | |
| CN112795932B (en) | Method for removing titanium anode surface coating | |
| US1893817A (en) | Electrode cleaning process | |
| CN113755900A (en) | Method for regulating and controlling remanufacturing of film by using old lead-based anode for zinc and manganese electrolysis | |
| JPH11240275A (en) | Manufacture of aluminum carrier for lithographic plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |