CN109468465B - Process for recovering metal copper and nickel salt from waste ABS electroplated part - Google Patents
Process for recovering metal copper and nickel salt from waste ABS electroplated part Download PDFInfo
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- CN109468465B CN109468465B CN201811528390.4A CN201811528390A CN109468465B CN 109468465 B CN109468465 B CN 109468465B CN 201811528390 A CN201811528390 A CN 201811528390A CN 109468465 B CN109468465 B CN 109468465B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0084—Treating solutions
- C22B15/0089—Treating solutions by chemical methods
- C22B15/0091—Treating solutions by chemical methods by cementation
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
- C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
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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
Abstract
The invention discloses a process for recovering metal copper and nickel salt from a waste ABS electroplated part, which comprises six steps of crushing, magnetic separation, dissolution, replacement, refining and production. The invention adopts pure salt method and air oxidation method to separate ABS electroplating material from metal without damaging plastics, and replaces the deplating solution, namely copper chloride, cuprous chloride and brown mixed solution of nickel chloride, with copper-nickel alloy magnetically separated from the crushed ABS electroplating material to obtain qualified copper sheet, so as to separate copper from nickel, the filtrate after replacement is qualified crude nickel chloride solution, and after refining and impurity removing, refined nickel chloride solution is obtained, and after concentration and crystallization (mother solution can be repeatedly used), nickel chloride product is obtained by drying. The invention has the advantages of low cost, simple process, convenient operation, single raw material and high economic benefit, the used raw material does not damage ABS products, and the whole process does not generate pollution, thereby solving the difficult problems of the industry and realizing the maximum economic value of the industry.
Description
Technical Field
The invention relates to a waste resource recovery process, in particular to a process for recovering metal copper and nickel salt from waste ABS electroplated parts.
Background
With the increasing automobile quantity in China, ABS plated parts are more and more, and the ABS plated parts are more and more scrapped in electroplating production, because the surface plating layer of the ABS plated parts contains more than 95% of copper and nickel and about 4% of other metals, the recycling of the scrapped ABS plated parts is urgent, and the existing recycling method of the ABS plated parts comprises the following steps:
1. stripping with hydrochloric acid and hydrogen peroxide (copper plate obtained by using electrode);
2. adding nitric acid into sulfuric acid or nitric acid (replacing with iron powder to obtain copper powder);
3. mixing acid and introducing air (adding ammonia water and alkali to obtain basic copper sulfate and nickel hydroxide);
4. adding sodium chloride or hydrogen peroxide into sulfuric acid (adding soda ash to obtain copper mud and nickel mud).
The prior domestic recovery process of the ABS electroplated part mainly has the following problems:
1. the pollution problem is as follows: a large amount of acid and alkali and chemical reagents are added in the treatment process, so that the consumption of raw materials is high, the mother liquor cannot be well recycled, and certain waste is generated in the production process to cause secondary pollution;
2. the process is complex, the operation is complicated, the cost is high, and the economic effect is not good;
3. the recovery quality problem is as follows: ABS plastic products are poor in quality and easy to contain metal, plastic molecules are damaged, and the ABS plastic products can only be used for three-level recovery.
Disclosure of Invention
The invention aims to solve the problems and provide a process for recovering metal copper and nickel salt from waste ABS electroplated parts.
In order to realize the purpose, the invention adopts the technical scheme that: a process for recovering metal copper and nickel salt from a waste ABS electroplated part is characterized by comprising the following steps:
step 1, crushing: shearing and crushing the recovered waste ABS electroplated part by a crusher;
step 2, magnetic separation: selecting copper-nickel alloy from the crushed ABS electroplated part obtained in the step (1) by using a magnetic separator for later use;
step 3, dissolving: putting the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 into a container filled with a hydrochloric acid solution, introducing air for oxidation, or occasionally spraying the hydrochloric acid solution in a reaction kettle filled with the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 until the metal is completely separated from the ABS alloy, and filtering to obtain a deplating solution, namely a brown mixed solution of cuprous chloride, copper chloride and nickel chloride;
and 4, replacement: adding excessive copper-nickel alloy magnetically selected in the step 2 and brown mixed solution prepared in the step 3 into a No. 1 reaction kettle, performing a displacement reaction, discharging qualified crude nickel chloride solution after the reaction, reserving unqualified slag copper metal in the No. 1 reaction kettle, adding the brown mixed solution prepared in the step 3 into the No. 1 reaction kettle, continuing the reaction, collecting the qualified copper sheet prepared by a net frame after the reaction, pumping the unqualified crude nickel chloride solution into the No. 2 reaction kettle from a No. 1 reaction kettle pump, adding excessive copper-nickel alloy, continuing the displacement reaction, discharging the qualified crude nickel chloride solution, adding the brown mixed solution prepared in the step 3, continuing the reaction, collecting the qualified copper sheet prepared by the net frame after the reaction, pumping the unqualified crude nickel chloride solution into the No. 1 reaction kettle for the displacement, the volumes of the brown mixed solutions added for three times in the operation are the same; the replacement reaction is repeatedly carried out in such a circulating way, and finally, qualified crude nickel chloride solution and qualified copper sheet are obtained;
and step 5, refining: removing impurities from the qualified crude nickel chloride solution obtained in the step (4) and extracting to prepare a refined nickel chloride solution;
step 6, product: and (5) evaporating, concentrating, cooling, crystallizing and drying the refined nickel chloride solution obtained in the step (5) to obtain a nickel chloride product.
The hydrochloric acid solution in the step 3 is formed by mixing industrial hydrochloric acid and water, and the mixture ratio of the industrial hydrochloric acid and the water is as follows: 1:1 or 2:1 or 3:1, and the pH value of the reaction end point is 1.5-3.0.
The conditions of the step 4 displacement reaction are as follows: the temperature is controlled to be 75-80 ℃.
And 4, when the qualified copper sheet is prepared in the step 4, the copper content of the added brown mixed solution exceeds the nickel content of the excessive copper and nickel metal, so that the copper sheet material is guaranteed to be a copper product with the nickel content of less than 0.5%.
The specific requirement of the qualified crude nickel chloride solution in the step 4 is that the content of copper ions in the solution is less than or equal to 1 g/L; the specific requirement of the qualified copper sheet is that the content of nickel in the copper sheet is 0.4-0.5%.
The invention has the beneficial effects that: the invention solves all the difficulties of the traditional process, such as the traditional method: (1) hydrochloric acid and hydrogen peroxide method: the cost is increased by the treatment of the acid-changing crude nickel chloride solution after electrolytic copper and the addition of hydrogen peroxide; (2) the method of adding nitric acid or nitric acid into sulfuric acid, replacing copper powder with iron, but the recovery of valuable nickel is difficult to treat by producing mixed solution of iron and nickel, and ABS products are damaged by nitric acid, (3) the method of mixing acid with air: the basic copper sulfate and nickel hydroxide produced have a great deal of waste water, copper and nickel salts are semi-finished products, consume a great deal of alkali, are not end products, and pollute the environment (the sodium salt of mixed acid is discharged). In conclusion, the traditional method has a plurality of problems, the process is simple, the operation is convenient, the raw materials are single, the economic benefit is high, the ABS electroplating material is separated from the metal by adopting a pure salt method and an air oxidation method, and the used raw materials do not damage an ABS product, as can be seen from tables 1 to 3, the content of nickel ions in the final product, namely nickel chloride, is very high, the content of other metal ions is very low and can be almost ignored, the recovery rate of the metal copper and the nickel salt is high, the whole process does not generate pollution, the difficult problem of the industry is solved, and the maximum economic value of the industry is realized.
The reaction principle of the invention is as follows: dissolving: hydrochloric acid, copper and oxygen in the air generate cupric chloride, copper ions react with excessive metal to generate cuprous chloride, and the cuprous chloride and a large amount of free chloride ions form a complex [ H (CuCl)2)]The copper is dissolved in a large amount of chloride ion solution to be stable, nickel is replaced by excessive 1-valent copper ions and 2-valent copper ions into nickel chloride at the moment, copper simple substances are generated at the same time, the two reactions are repeatedly changed, and finally, metal on the ABS electroplating material is completely dissolved to generate brown cuprous chloride, copper chloride and nickel chloride mixed solution, namely deplating solution; and (3) replacement: and reacting the 1-valent copper ion chloride and the 2-valent copper ion chloride with excessive copper-nickel alloy to generate a nickel chloride solution and a copper simple substance.
Step 3 the chemical reaction mechanism involved in the dissolution process:
(1) and (2) the reaction is combined to finally form (3) the reaction:
step 4 the chemical reaction mechanism involved in the displacement reaction:
Detailed Description
The present invention is described in detail below for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the description of the present invention is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Example 1:
a process for recovering metal copper and nickel salt from a waste ABS electroplated part comprises the following steps:
step 1, crushing: shearing and crushing the recovered waste ABS electroplated part by a crusher;
step 2, magnetic separation: selecting copper-nickel alloy from the crushed ABS electroplated part obtained in the step (1) by using a magnetic separator for later use;
step 3, dissolving: putting the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 into a container filled with a hydrochloric acid solution, introducing air for oxidation, or occasionally spraying the hydrochloric acid solution in a reaction kettle filled with the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 until the metal is completely separated from the ABS alloy, and filtering to obtain a deplating solution, namely a brown mixed solution of cuprous chloride, copper chloride and nickel chloride;
and 4, replacement: adding 1.5 tons of copper-nickel alloy magnetically selected in the step 2 and 4000L of brown mixed solution prepared in the step 3 into a No. 1 reaction kettle, performing a displacement reaction, discharging qualified crude nickel chloride solution after the reaction, reserving unqualified slag copper metal in the No. 1 reaction kettle at the moment, adding 4000L of brown mixed solution prepared in the step 3 into the No. 1 reaction kettle for continuous reaction, collecting the qualified copper sheet prepared by a screen frame after the reaction, discharging unqualified crude nickel chloride solution in the No. 1 reaction kettle, pumping the unqualified crude nickel chloride solution into a No. 2 reaction kettle from a No. 1 reaction kettle pump, adding 1.5 tons of copper-nickel alloy for continuous displacement reaction, discharging the qualified crude nickel chloride solution, adding 4000L of brown mixed solution prepared in the step 3 for continuous reaction, collecting the qualified copper sheet by the screen frame after the reaction, discharging the unqualified crude nickel chloride solution in the No. 2 reaction kettle, pumping the unqualified crude nickel chloride solution into the No. 1 reaction kettle for displacement, the volumes of the brown mixed solutions added for three times in the operation are the same; the replacement reaction is repeatedly carried out in such a circulating way, and finally, qualified crude nickel chloride solution and qualified copper sheet are obtained;
and step 5, refining: removing impurities from the qualified crude nickel chloride solution obtained in the step (4) and extracting to prepare a refined nickel chloride solution;
step 6, product: and (5) evaporating, concentrating, cooling, crystallizing and drying the refined nickel chloride solution obtained in the step (5) to obtain a nickel chloride product.
The hydrochloric acid solution in the step 3 is formed by mixing industrial hydrochloric acid and water, and the mixture ratio of the industrial hydrochloric acid and the water is as follows: 1:1, and the pH value at the end of the reaction was 1.5.
The conditions of the step 4 displacement reaction are as follows: the temperature was controlled at 75 ℃.
And 4, when the qualified copper sheet is prepared in the step 4, the copper content of the added brown mixed solution exceeds the nickel content of the excessive copper and nickel metal, so that the copper sheet material is guaranteed to be a copper product with the nickel content of less than 0.5%.
The specific requirement of the qualified crude nickel chloride solution in the step 4 is that the content of copper ions in the solution is less than or equal to 1 g/L; the specific requirement of the qualified copper sheet is that the content of nickel in the copper sheet is 0.4-0.5%.
TABLE 1 composition analysis of ABS electroplate leachate
Example 2:
a process for recovering metal copper and nickel salt from a waste ABS electroplated part comprises the following steps:
step 1, crushing: shearing and crushing the recovered waste ABS electroplated part by a crusher;
step 2, magnetic separation: selecting copper-nickel alloy from the crushed ABS electroplated part obtained in the step (1) by using a magnetic separator for later use;
step 3, dissolving: putting the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 into a container filled with a hydrochloric acid solution, introducing air for oxidation, or occasionally spraying the hydrochloric acid solution in a reaction kettle filled with the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 until the metal is completely separated from the ABS alloy, and filtering to obtain a deplating solution, namely a brown mixed solution of cuprous chloride, copper chloride and nickel chloride;
and 4, replacement: adding 1.5 tons of copper-nickel alloy magnetically selected in the step 2 and 4000L of brown mixed solution prepared in the step 3 into a No. 1 reaction kettle, performing a displacement reaction, discharging qualified crude nickel chloride solution after the reaction, reserving unqualified slag copper metal in the No. 1 reaction kettle at the moment, adding 4000L of brown mixed solution prepared in the step 3 into the No. 1 reaction kettle for continuous reaction, collecting the qualified copper sheet prepared by a screen frame after the reaction, discharging unqualified crude nickel chloride solution in the No. 1 reaction kettle, pumping the unqualified crude nickel chloride solution into a No. 2 reaction kettle from a No. 1 reaction kettle pump, adding 1.5 tons of copper-nickel alloy for continuous displacement reaction, discharging the qualified crude nickel chloride solution, adding 4000L of brown mixed solution prepared in the step 3 for continuous reaction, collecting the qualified copper sheet by the screen frame after the reaction, discharging the unqualified crude nickel chloride solution in the No. 2 reaction kettle, pumping the unqualified crude nickel chloride solution into the No. 1 reaction kettle for displacement, the volumes of the brown mixed solutions added for three times in the operation are the same; the replacement reaction is repeatedly carried out in such a circulating way, and finally, qualified crude nickel chloride solution and qualified copper sheet are obtained;
and step 5, refining: removing impurities from the qualified crude nickel chloride solution obtained in the step (4) and extracting to prepare a refined nickel chloride solution;
step 6, product: and (5) evaporating, concentrating, cooling, crystallizing and drying the refined nickel chloride solution obtained in the step (5) to obtain a nickel chloride product.
The hydrochloric acid solution in the step 3 is formed by mixing industrial hydrochloric acid and water, and the mixture ratio of the industrial hydrochloric acid and the water is as follows: 3:1, and the pH value at the end of the reaction was 2.5.
The conditions of the step 4 displacement reaction are as follows: the temperature was controlled at 80 ℃.
And 4, when the qualified copper sheet is prepared in the step 4, the copper content of the added brown mixed solution exceeds the nickel content of the excessive copper and nickel metal, so that the copper sheet material is guaranteed to be a copper product with the nickel content of less than 0.5%.
The specific requirement of the qualified crude nickel chloride solution in the step 4 is that the content of copper ions in the solution is less than or equal to 1 g/L; the specific requirement of the qualified copper sheet is that the content of nickel in the copper sheet is 0.4-0.5%.
TABLE 2 composition analysis of ABS electroplate leachate
Example 3:
a process for recovering metal copper and nickel salt from a waste ABS electroplated part comprises the following steps:
step 1, crushing: shearing and crushing the recovered waste ABS electroplated part by a crusher;
step 2, magnetic separation: selecting copper-nickel alloy from the crushed ABS electroplated part obtained in the step (1) by using a magnetic separator for later use;
step 3, dissolving: putting the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 into a container filled with a hydrochloric acid solution, introducing air for oxidation, or occasionally spraying the hydrochloric acid solution in a reaction kettle filled with the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 until the metal is completely separated from the ABS alloy, and filtering to obtain a deplating solution, namely a brown mixed solution of cuprous chloride, copper chloride and nickel chloride;
and 4, replacement: adding 1.5 tons of copper-nickel alloy magnetically selected in the step 2 and 4000L of brown mixed solution prepared in the step 3 into a No. 1 reaction kettle, performing a displacement reaction, discharging qualified crude nickel chloride solution after the reaction, reserving unqualified slag copper metal in the No. 1 reaction kettle at the moment, adding 4000L of brown mixed solution prepared in the step 3 into the No. 1 reaction kettle for continuous reaction, collecting the qualified copper sheet prepared by a screen frame after the reaction, discharging unqualified crude nickel chloride solution in the No. 1 reaction kettle, pumping the unqualified crude nickel chloride solution into a No. 2 reaction kettle from a No. 1 reaction kettle pump, adding 1.5 tons of copper-nickel alloy for continuous displacement reaction, discharging the qualified crude nickel chloride solution, adding 4000L of brown mixed solution prepared in the step 3 for continuous reaction, collecting the qualified copper sheet by the screen frame after the reaction, discharging the unqualified crude nickel chloride solution in the No. 2 reaction kettle, pumping the unqualified crude nickel chloride solution into the No. 1 reaction kettle for displacement, the volumes of the brown mixed solutions added for three times in the operation are the same; the replacement reaction is repeatedly carried out in such a circulating way, and finally, qualified crude nickel chloride solution and qualified copper sheet are obtained;
and step 5, refining: removing impurities from the qualified crude nickel chloride solution obtained in the step (4) and extracting to prepare a refined nickel chloride solution;
step 6, product: and (5) evaporating, concentrating, cooling, crystallizing and drying the refined nickel chloride solution obtained in the step (5) to obtain a nickel chloride product.
The hydrochloric acid solution in the step 3 is formed by mixing industrial hydrochloric acid and water, and the mixture ratio of the industrial hydrochloric acid and the water is as follows: 2:1, and the pH value at the end of the reaction was 3.0.
The conditions of the step 4 displacement reaction are as follows: the temperature was controlled at 78 ℃.
And 4, when the qualified copper sheet is prepared in the step 4, the copper content of the added brown mixed solution exceeds the nickel content of the excessive copper and nickel metal, so that the copper sheet material is guaranteed to be a copper product with the nickel content of less than 0.5%.
The specific requirement of the qualified crude nickel chloride solution in the step 4 is that the content of copper ions in the solution is less than or equal to 1 g/L; the specific requirement of the qualified copper sheet is that the content of nickel in the copper sheet is 0.4-0.5%.
TABLE 3 composition analysis of ABS electroplate leachate
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (5)
1. A process for recovering metal copper and nickel salt from a waste ABS electroplated part is characterized by comprising the following steps:
step 1, crushing: shearing and crushing the recovered waste ABS electroplated part by a crusher;
step 2, magnetic separation: selecting copper-nickel alloy from the crushed ABS electroplated part obtained in the step (1) by using a magnetic separator for later use;
step 3, dissolving: putting the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 into a container filled with a hydrochloric acid solution, introducing air for oxidation, or occasionally spraying the hydrochloric acid solution in a reaction kettle filled with the residual waste ABS plated part fragments subjected to magnetic separation in the step 2 until the metal is completely separated from the ABS alloy, and filtering to obtain a deplating solution, namely a brown mixed solution of cuprous chloride, copper chloride and nickel chloride;
and 4, replacement: adding excessive copper-nickel alloy magnetically selected in the step 2 and brown mixed solution prepared in the step 3 into a No. 1 reaction kettle, performing a displacement reaction, discharging qualified crude nickel chloride solution after the reaction, reserving unqualified slag copper metal in the No. 1 reaction kettle, adding the brown mixed solution prepared in the step 3 into the No. 1 reaction kettle, continuing the reaction, collecting the qualified copper sheet prepared by a net frame after the reaction, pumping the unqualified crude nickel chloride solution into the No. 2 reaction kettle from a No. 1 reaction kettle pump, adding excessive copper-nickel alloy, continuing the displacement reaction, discharging the qualified crude nickel chloride solution, adding the brown mixed solution prepared in the step 3, continuing the reaction, collecting the qualified copper sheet prepared by the net frame after the reaction, pumping the unqualified crude nickel chloride solution into the No. 1 reaction kettle for the displacement, the volumes of the brown mixed solutions added for three times in the operation are the same; the replacement reaction is repeatedly carried out in such a circulating way, and finally, qualified crude nickel chloride solution and qualified copper sheet are obtained;
and step 5, refining: removing impurities from the qualified crude nickel chloride solution obtained in the step (4) and extracting to prepare a refined nickel chloride solution;
step 6, product: and (5) evaporating, concentrating, cooling, crystallizing and drying the refined nickel chloride solution obtained in the step (5) to obtain a nickel chloride product.
2. The process for recovering metal copper and nickel salt from waste ABS electroplates according to claim 1, wherein the hydrochloric acid solution in the step 3 is prepared by mixing industrial hydrochloric acid and water, and the mixture ratio of the industrial hydrochloric acid and the water is as follows: 1:1 or 2:1 or 3:1, and the pH value of the reaction end point is 1.5-3.0.
3. The process for recovering metallic copper and nickel salt of a waste ABS plated item according to claim 1 or 2, wherein the condition of the step 4 displacement reaction is: the temperature is controlled to be 75-80 ℃.
4. The process for recovering metal copper and nickel salt of the waste ABS electroplate part as claimed in claim 1, wherein when qualified copper sheet is prepared in the step 4, the copper content of the added brown mixed solution exceeds the nickel content of the excessive copper and nickel metal, so that the copper sheet material is ensured to be a copper product with the nickel content of less than 0.5%.
5. The process for recovering metal copper and nickel salt from the waste ABS electroplated parts as claimed in claim 4, wherein the specific requirement of the qualified crude nickel chloride solution in the step 4 is that the content of copper ions in the solution is less than or equal to 1 g/L; the specific requirement of the qualified copper sheet is that the content of nickel in the copper sheet is 0.4-0.5%.
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| CN110180861B (en) * | 2019-04-28 | 2021-07-09 | 周丹丹 | Clean production method for recycling waste packaging iron drum |
| CN111361050A (en) * | 2020-01-17 | 2020-07-03 | 宁波多普达聚合物有限公司 | Deplating recovery method for electroplating ABS plastic |
| CN112063842A (en) * | 2020-08-18 | 2020-12-11 | 温州科锐环境资源利用有限公司 | Deplating recovery process for electroplating ABS (acrylonitrile butadiene styrene) plastic |
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