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Comprehensive recycling process of copper-containing etching waste solution

A technology of etching waste liquid and acidic etching waste liquid, which is applied in the direction of copper sulfate, copper halide, copper chloride, etc., can solve the problems of complex process, waste of etching waste liquid, and expensive use, so as to simplify the treatment process and improve copper recovery rate, the effect of improving the recovery rate

Inactive Publication Date: 2018-07-06
韶关鹏瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these acidic or alkaline etching waste liquids are not treated, the environment will be polluted, and useful materials such as copper in the etching waste liquid will be wasted.
[0003] At present, the treatment methods for alkaline or acidic etching waste liquid include: electrolytic copper extraction treatment method, the disadvantage of which is complex process and large investment; solvent extraction method, which is to add extractant to alkaline etching waste liquid to obtain Copper solution and etching regeneration solution, the disadvantage of this method is that it needs to use expensive extractant, the process is cumbersome; and the method of reducing and purifying copper, the disadvantage of this method is that the process control is complicated and the cost is high

Method used

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Examples

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Embodiment 1

[0039] Acidic etching waste liquid 500L, which contains 150g / L copper ion, 1.0mol / L hydrochloric acid, 4000mg / L COD, a small amount of cuprous ion, pH is 3.5. 500L alkaline etching waste liquid, which contains 130g / L copper ion, 10mol / L ammonium ion, 3800mg / L COD and 15ppm arsenic, pH is 8.9.

[0040] The specific treatment process is as follows:

[0041] (1) Pretreatment of alkaline etching waste liquid, add medicament 820g magnesium chloride, 120gPAM to remove impurity arsenic in alkaline etching waste liquid, remove mechanical particle impurity through filter press;

[0042] (2) Pretreatment of acidic etching waste liquid, adding hydrogen peroxide to the acidic etching waste liquid to oxidize cuprous ions to copper ions, T improves the recovery rate, and removes mechanical particulate matter and oil stains through a filter press, so as not to affect the crystallization of subsequent products;

[0043] (3) Pump the pretreated acidic etching waste liquid and alkaline etching...

Embodiment 2

[0048] Acidic etching waste liquid 1000L, which contains 140g / L copper ion, 2.0mol / L hydrochloric acid, 4000mg / L COD, a small amount of cuprous ion, pH is 2.5. 100L of alkaline etching waste liquid, which contains 130g / L of copper ions, 10mol / L of ammonium ions, 3800mg / L of COD and 15ppm of arsenic, with a pH of 8.9.

[0049] The specific treatment process is as follows:

[0050] Pretreatment of acidic etching waste liquid, adding hydrogen peroxide to the acidic etching waste liquid to oxidize cuprous ions to copper ions, and remove mechanical particulate matter and oil stains through a filter press;

[0051] Pump 450L of pretreated acidic etching waste liquid into about 5500mol of ammonia gas, prepare it into an alkaline solution with a pH of 8.5, and keep stirring gently to fully react;

[0052] The main reaction equation:

[0053] HCl+NH 3 =NH4 Cl

[0054] CuCl 2 +4NH 3 ==Cu(NH 3 ) 4 Cl 2 ;

[0055] Mix 450L of prepared alkaline etching solution with 100L of etchi...

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Abstract

The invention discloses a recycling process of a copper-containing etching waste solution. The recycling process comprises the following steps: removing mechanical particles and arsenic in an alkalinewaste solution by virtue of magnesium chloride, PAM and a press filtering machine, removing the mechanical particles and oil contaminants in an acid waste solution by virtue of a press filtering machine, neutralizing the acid waste solution and alkaline waste solution to obtain alkaline copper chloride, or acidifying by using sulfuric acid to obtain copper sulfate; and when the alkaline waste solution is insufficient, introducing ammonia gas into the acid waste solution with the mechanical particles and the oil contaminants removed by virtue of the press filtering machine, adjusting the solution to be alkaline, and then performing the neutralization reaction to obtain alkaline copper chloride or copper sulfate. The comprehensive recycling process is simple, low cost, capable of massivelytreating the etching waste solution, and capable of recycling the copper and realizing the safety up-to-standard treatment of the etching waste solution.

Description

technical field [0001] The invention relates to the environmental protection technical field of recycling, in particular to a recycling process of copper-containing etching waste liquid. Background technique [0002] Circuit board etchant can be divided into alkaline and acidic. The main components contained in the alkaline etching waste liquid are copper ammonium complex, ammonium chloride, and arsenic impurities. The main components of acidic etching waste liquid are copper chloride and hydrochloric acid. At present, some manufacturers use acid etching process, while others use alkaline etching process. Acid etching is suitable for inner layer, Allegro, and ordinary single- and double-sided panels, and its etching speed is relatively slow; alkaline etching is suitable for high-precision boards, and its etching speed is relatively slow. quick. If these acidic or alkaline etching waste liquids are not treated, the environment will be polluted, and useful materials such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/05C01G3/10
CPCC01G3/05C01G3/10
Inventor 沈君华蔡卫宜叶祖渠
Owner 韶关鹏瑞环保科技有限公司
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