Additives for recycling copper

An additive and copper recovery technology, applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of copper product form and quality decline, and achieve the effects of increasing polarization, increasing overpotential, and high purity

Active Publication Date: 2018-03-02
SHENZHEN JECH TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an additive for recovering copper, aiming to solve the problem tha

Method used

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  • Additives for recycling copper
  • Additives for recycling copper
  • Additives for recycling copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add additives containing 1,2-ethylenethiourea 10ppm, benzylated polyethyleneimine 20ppm and methylene naphthalene disulfonate 15ppm to a copper ion concentration of 45g / L and a chloride ion concentration of 190g / L , pH = 9 etching solution, and electrolysis with a current density of 250A / m2 for 24 hours.

Embodiment 3

[0024] Get the additive that comprises thiazolinone polydithiopropane sulfonate sodium 20ppm, dimethyldiallyl ammonium chloride 10ppm and hexadecane-betaine 5ppm to add to copper ion concentration and be 45g / L, and chloride ion concentration is 190g / L, pH = 9 etching solution, and electrolysis with a current density of 250A / m2 for 24 hours.

[0025] Example 3

[0026] An additive comprising 20 ppm of dithiobiuret, 10 ppm of triazine amide and 5 ppm of propylene glycol block polyether was added to an etching solution with a copper ion concentration of 45 g / L, a chloride ion concentration of 190 g / L, and a pH=9, And electrolysis for 24 hours with a current density of 250A / m2.

Embodiment 4

[0028] Get the additive that comprises 1,2-ethylenethiourea 10ppm, dithiobiuret 10ppm, dimethyldiallyl ammonium chloride 15ppm and methylene naphthalene disulfonate 10ppm and join to copper ion concentration of 45g / L, chloride ion concentration of 190g / L, pH = 9 etching solution, and electrolysis at a current density of 250A / m2 for 24 hours.

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Abstract

The invention provides additives for recycling copper, and relates to the technical field of material preparation. The additives comprise 10-50 ppm of a brightener, 10-30 ppm of a leveling agent and 5-20 ppm of a surface active agent. By adding the additives including the brightener, the leveling agent and the surface active agent in etching liquid, the overpotential is improved, polarization is increased, the electrode reaction speed is reduced, and a fine-grain and bright copper clad layer is finally obtained. Therefore, a copper layer with a bright and flat surface, high purity, a compact structure and ductility is obtained through recycling.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to an additive for recovering copper. Background technique [0002] Alkaline etchant is a chemical widely used in the production process of printed circuit board (PCB). Utilizing alkaline etching solution can produce an alkaline etching waste solution containing high concentration copper. In order to save resources, the copper in the waste liquid is generally regenerated and recycled. [0003] At present, there are two methods for regeneration and circulation treatment of alkaline etching solution. One is the extraction method, which uses the difference in the distribution ratio of copper ions in the extraction agent and the etching waste liquid, and mixes the extraction agent with the etching waste liquid to transfer the copper ions in the etching waste liquid into the extraction agent, and back-extract with sulfuric acid solution. Obtain copper sulfate ...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C7/06
CPCC25C1/12C25C7/06Y02P10/20
Inventor 李建光崔磊张良卢江峰刘智凯
Owner SHENZHEN JECH TECH
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