Method for recycling copper and nickel in electroplating sludge

A recycling method, electroplating sludge technology, applied in the direction of improving process efficiency, etc., can solve problems such as difficult wastewater treatment, and achieve the effect of high degree of automation, strong adaptability and mature technology

Inactive Publication Date: 2018-10-02
TIANJIN RUISAIKE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is extremely difficult to treat so much wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1, a method for recovering copper and nickel in electroplating sludge. The step 1 to separate copper is as follows: adjust the leachate (hereinafter referred to as mother liquor) to pH=5-5.5 with sodium carbonate solution, and filter the precipitate to be mainly alkali Formula copper carbonate and copper hydroxide.

Embodiment 2

[0012] A method for recovering copper and nickel in electroplating sludge, the step 2 of iron-nickel co-precipitation and iron is as follows: the mother liquor is adjusted to pH=8-9 with sodium carbonate solution, and the precipitate is nickel carbonate, iron hydroxide, hydrogen Ferrous oxide, add sulfuric acid and hydrogen peroxide to completely dissolve the precipitate and adjust with lye) pH=5 to filter out the precipitate, which is ferric hydroxide.

Embodiment 3

[0014] A method for recovering copper and nickel in electroplating sludge. Step 3 of the purification and separation of nickel products is specifically: taking the above filtered mother liquor and adjusting pH=2 with sulfuric acid and passing hydrogen sulfide into it to convert the copper in the mixed solution into sulfide Copper is separated, and the mother liquor at this time is nickel sulfate mother liquor, and nickel sulfate heptahydrate can be produced by the method of concentrated crystallization.

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PUM

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Abstract

The invention provides a method for recycling copper and nickel in electroplating sludge. A separation method comprises the steps of 1, separation of copper, wherein a sodium carbonate solution is adopted for adjusting the pH of leachate called mother liquor to 5-5.5, and filtered sediments are mainly basic cupric carbonate and copper hydroxide; 2, separation of iron and nickel, wherein a sodium carbonate solution is utilized for adjusting the pH of the mother liquor to 8-9, sediments are nickel carbonate, ferric hydroxide and ferrous hydroxide, sulfuric acid and hydrogen peroxide are added tofully dissolve the sediments, afterwards, the pH is adjusted to 5 through alkaline liquor, and a sediment, namely ferric hydroxide, is filtered out; 3, purification and separation of a nickel product, wherein the filtered mother liquor is taken, the pH is adjusted by sulfuric acid to 2, hydrogen sulfide is introduced, copper in mixed liquor is turned into copper sulphide and separated out, at this moment, the mother liquor is nickel sulfate mother liquor, and nickel sulfate heptahydrate can be produced through a concentration and crystallization method. The method has the advantages that theinvestment is small, the technology is mature, the adaptability is high, and the automated degree is high.

Description

Technical field [0001] The invention relates to a method for recovering copper and nickel in electroplating sludge. Background technique [0002] With the development of material science, surface treatment processes such as electroplating and electroless plating are increasingly used in material production and processing. There are currently more than 50,000 electroplating plants in my country, which discharge about 6.7 billion electroplating wastewater annually. It is extremely difficult to treat so much waste water. Summary of the invention [0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is how to provide a method for recovering copper and nickel in electroplating sludge, which has the advantages of low investment, mature technology, strong adaptability, and high degree of automation. [0004] In order to solve the above technical problems, the technical solution adopted by the present invention is a method for r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00
CPCC22B7/006C22B15/0089C22B15/0093C22B23/0461Y02P10/20
Inventor 宋振兴谢玉娟
Owner TIANJIN RUISAIKE NEW MATERIAL TECH CO LTD
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