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Method for recovering valuable metals from waste plastic plating layer containing copper and nickel

A technology for valuable metals and waste plastics, applied in the field of recovering valuable metals from copper-nickel waste plastic coatings, can solve the problems of no specific embodiment, large acid-base consumption in iron removal process, strong nitric acid corrosion, etc., Achieve the effect of strong practicability, low reagent cost and flexible processing technology

Inactive Publication Date: 2013-07-10
NORTHEASTERN UNIV LIAONING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent application CN101476041 discloses a method for separating and recovering copper, nickel and recycled plastics from waste electroplating plastics. Its main features are: after the waste electroplating plastics are crushed with a crusher, nitric acid is used to dissolve metals such as copper and nickel on the surface. The insoluble matter is filtered and washed to obtain pure plastic; the solution containing copper and nickel is replaced by iron powder to obtain high-purity sponge copper; the remaining liquid is removed by jarosite method to remove iron, and P204 is extracted to remove impurity ions such as copper and iron to obtain pure nitric acid Nickel solution, after electrowinning treatment, produces metal nickel plate; the disadvantage of this method is that nitric acid is highly corrosive and expensive. In order to realize the separation of copper and nickel, a large amount of iron powder added is almost all reacted into the nickel sulfate solution, and the subsequent P204 The acid and alkali consumption of the iron removal process is large, and after iron removal, how to deal with the jarosite slag has not been considered
[0005] The Chinese patent application with the application number 201010301214 discloses a method for recovering metal and plastic in waste plastics containing metal coatings. The waste plastics are added to excess hydrochloric acid solution, and industrial oxygen is charged at the same time to make hydrochloric acid and metal coatings fully Reaction, separation to obtain deplating plastics and mixed solution; add excessive iron filings to the mixed solution, fully react, filter to obtain mixed metal and mixed solution of copper, nickel, iron; Suck out iron and nickel to obtain iron-nickel mixed metal and metallic copper respectively; this method uses oxygen as an oxidant, and the hydrochloric acid system leaches the metal coating, but the separation of copper and nickel in the leaching solution still adopts selective replacement of iron powder; reduction with iron powder The feasibility of replacing nickel is not reflected in the specific examples in the patent, and there is still a problem of removing a large amount of iron in the mixed solution

Method used

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  • Method for recovering valuable metals from waste plastic plating layer containing copper and nickel
  • Method for recovering valuable metals from waste plastic plating layer containing copper and nickel
  • Method for recovering valuable metals from waste plastic plating layer containing copper and nickel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mass content of copper in the copper-nickel waste plastic coating that adopts is 50.5%, and the mass content of nickel is 43.1%, and the mass content of plastics is 6.4%, and XRD analysis result is as follows figure 2 shown;

[0032] Mechanically crush and sieve the copper-nickel-containing waste plastic coating to make debris with a particle size of ≤5mm;

[0033] Put the debris in the leaching tank, add acid solution and leaching under stirring conditions, the leaching temperature is 90°C, and the leaching time is 2h;

[0034] Described acid solution is prepared by the sulfuric acid of mass concentration 95%, corrosive agent and water, and the volume of acid solution is 3m 3 / t debris;

[0035] The amount of sulfuric acid is 1.5 times the mass of nickel in the debris;

[0036] The corrosive agent is sulfur, and the amount of sulfur is 0.2 times the mass of copper in the debris;

[0037] After the leaching is completed, let it stand until the leaching slag set...

Embodiment 2

[0042] The mass content of copper in the copper-nickel waste plastic coating that adopts is 62.5%, the mass content of nickel is 31.5%, and the mass content of plastic is 6%;

[0043] Mechanically crush and sieve the copper-nickel-containing waste plastic coating to make debris with a particle size of ≤5mm;

[0044] Put the debris in the leaching tank, add acid solution and leaching under stirring conditions, the leaching temperature is 95°C, and the leaching time is 0.5h;

[0045] Described acid solution is prepared by the sulfuric acid of mass concentration 95%, corrosive agent and water, and the volume of acid solution is 3m 3 / t debris;

[0046] The amount of sulfuric acid is twice the mass of nickel in the debris;

[0047] The corrosive agent is sulfur, and the amount of sulfur is 0.2 times the mass of copper in the debris;

[0048] After the leaching is completed, let it stand until the leaching slag is precipitated; pour out the part with plastic in the leaching solut...

Embodiment 3

[0053] The mass content of copper in the copper-nickel-containing waste plastic coating that is adopted is 30.6%, the mass content of nickel is 65.7%, and the mass content of plastic is 3.7%;

[0054] Mechanically crush and sieve the copper-nickel-containing waste plastic coating to make debris with a particle size of ≤5mm;

[0055] Put the debris in the leaching tank, add acid solution and leaching under stirring conditions, the leaching temperature is 60°C, and the leaching time is 8h;

[0056] Described acid solution is prepared by the sulfuric acid of mass concentration 95%, corrosive agent and water, and the volume of acid solution is 8m 3 / t debris;

[0057] The amount of sulfuric acid is twice the mass of nickel in the debris;

[0058] The corrosive agent is sulfur and sodium sulfite, the amount of sulfur used is 0.2 times the mass of copper in the debris, and the amount of sodium sulfite is twice the mass of copper in the debris;

[0059] After the leaching is compl...

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Abstract

The invention relates to a method for recovering valuable metals from a waste plastic plating layer containing copper and nickel. The method comprises the following steps of: (1) crushing the waste plastic plating layer containing the copper and the nickel into scraps; (2) leaching the scraps with stirring by using an acid solution; and (3) after leaching, standing until the leached dregs are precipitated, removing plastics floated on leachate, and filtering the leached dregs and the leachate for separation, wherein after the waste plastic plating layer containing the copper and the nickel istreated, the nickel is contained in the leachate, and the copper is contained in the leached dregs. Copper and nickel intermediate products obtained by the method are high in recovery rates, a subsequent treatment process is flexible and simple, and the method is novel and high in practicality.

Description

technical field [0001] The invention relates to a method for recovering and treating valuable metals, in particular to a method for recovering valuable metals from copper-nickel-containing waste plastic coatings. Background technique [0002] Copper and nickel are widely used as the surface coating of plastic parts, which have the functions of wear resistance, corrosion resistance and beauty. With the increasing use of metal coatings, recycling metals from waste plastic coatings containing copper and nickel not only has the characteristics of efficient utilization of waste resources, but also an inevitable trend of environmental protection. [0003] Nickel is the most commonly used coating for plastic electroplating. Due to the requirements of the coating process, a layer of copper is usually plated on the plastic substrate, and then nickel is plated on the copper coating by electroplating or electroless plating; therefore, copper Nickel composite plating has become a typic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00B29B17/02
CPCY02P10/20Y02W30/62
Inventor 畅永锋李斌川范川林翟秀静
Owner NORTHEASTERN UNIV LIAONING
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