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Method for recovering copper and nickel from plastic chromium coatings

A technology of chrome plating and copper recovery, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of difficult recovery of valuable metals, high recovery cost, environmental impact, etc., and achieve low cost, small environmental pollution, and leaching high rate effect

Inactive Publication Date: 2010-06-02
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because it is difficult to recover valuable metals from waste liquid, and the recovery cost is high. At the same time, nitric acid, hydrochloric acid, etc. will also have an impact on the environment.

Method used

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  • Method for recovering copper and nickel from plastic chromium coatings
  • Method for recovering copper and nickel from plastic chromium coatings

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Weigh 80g of the coating, wherein Cu and Ni contents are 44.2% and 53.6% respectively, add 1L of 1.5mol / L H 2 SO 4 and 1mol / LH 2 o 2 The mixed solution has a liquid-solid ratio of 12.5:1. At room temperature, the leaching time is 30 minutes. After filtration, 1210ml of leachate is obtained. The concentrations of Cu, Ni and Cr in the leachate are 28.9g / L, 35.4g / L and 0.004g / L respectively. , to obtain 2.2 g of insoluble matter, whose Cu, Ni and Cr contents were 11.8%, 1.1% and 87.1%, respectively. The leaching rates of Cu and Ni reach 98.9% and 99.9% respectively.

[0011] At room temperature, the above leaching solution was added with a concentration of 7mol / L ammonia to adjust the pH=3, and the volume fraction was 15%, and the molar ratio was 1:1 2-hydroxyl-5-dodecyl salicylaldoxime and 2- Hydroxy-5-nonylacetophenone oxime mixture was used as extractant, extracted for 10min, and obtained copper-containing extract and 1350ml nickel-containing raffinate, wherein Cu a...

Embodiment 2

[0015] Weigh 80g of coating, wherein Cu and Ni contents are 40.8%, 34.7% and respectively, add 2L of 1mol / L H 2 SO 4 and 0.5mol / LH 2 o 2 The mixed solution has a liquid-solid ratio of 25:1. At room temperature, the leaching time is 60 minutes. After filtration, 2360ml of leachate is obtained. The concentrations of Cu, Ni and Cr in the leachate are 13.6g / L, 11.7g / L and 0.002g / L respectively. , to obtain 19.8 g of insoluble matter whose Cu, Ni and Cr contents were 0.9%, 0.2% and 98.5%, respectively. The leaching rates of Cu and Ni reach 98.5% and 99.6% respectively.

[0016] At room temperature, the above leaching solution was added with a concentration of 7mol / L ammonia to adjust the pH=2, and the volume fraction was 30%, and the molar ratio was 1:1 of 2-hydroxyl-5-dodecyl salicylaldoxime and 2- Hydroxy-5-nonylacetophenone oxime mixture was used as extractant, extracted for 20min, and obtained copper-containing extract and 2570ml nickel-containing raffinate, wherein Cu and ...

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Abstract

The invention provides a method for recovering copper and nickel from plastic chromium coatings. The method is characterized by consisting of the following steps of: 1, weighing the plastic chromium coatings, adding mixed solution of H2SO4 and H2O2 to the plastic chromium coatings for leaching, and filtering the mixed solution to obtain leachate and insoluble substances; 2, adjusting a pH value of the leachate, extracting the leachate by a mixture, serving as an extractant, of 2-hydroxyl-5-dodecyl salicylaldoxime and 2-hydroxyl-5-nonyl acetophenone oxime to obtain copper containing extraction solution and nickel containing raffinate, and back-extracting the copper containing extraction solution by sulfuric acid to obtain the copper containing back extraction solution; and 3, electrolyzing the copper containing back extraction solution and the nickel containing raffinate to obtain metal copper and metal nickel respectively. The method for recovering copper and nickel is lower in cost, causes little environmental pollution, and is suitable for the recycling of the plastic chromium coatings.

Description

technical field [0001] The invention relates to a method for recovering copper and nickel, in particular to a method for recovering copper and nickel from a plastic chrome plating layer. Background technique [0002] At present, the recycling of automobile waste plastics as a renewable resource has been paid more and more attention by people. Automobile ABS chrome-plated plastics, such as automobile front shield electroplated plastics, vehicle headlights, interior parts, wheel covers, etc. are scrapped, damaged and replaced. waste plastic. The plating layer of waste chrome-plated ABS plastic contains 4-10% copper and 5-9% nickel, which has a high recovery value. [0003] Domestic recovery methods mainly include nitric acid treatment, ferric chloride and hydrochloric acid hydrogen peroxide impregnation. The above method is to put the chrome-plated ABS plastic containing the chrome-plated layer into the corresponding solution, soak for a period of time, after the plated laye...

Claims

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Application Information

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IPC IPC(8): C25C1/08C25C1/12C22B3/08C22B3/40
CPCY02P10/20
Inventor 唐仁衡王英肖方明
Owner GUANGDONG INST OF RARE METALS
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