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Method for recovering gold from waste cyanogen-containing gold-plating liquid by electrolysis

A technology of electrolytic recycling and waste liquid, which is applied in the field of recycling, can solve the problems of difficult cathode plate, low electrolysis efficiency, separation, etc., achieve complete separation, meet environmental protection requirements, and solve the effect of separation and recovery of gold

Inactive Publication Date: 2010-05-12
苏州天地环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for electrolytically recovering gold from cyanide-containing gold plating waste liquid, the purpose of which is to solve the problems of low electrolytic efficiency and difficulty in separating the cathode plate from gold in the existing electrolytic gold recovery method

Method used

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  • Method for recovering gold from waste cyanogen-containing gold-plating liquid by electrolysis

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Embodiment 1

[0028] Embodiment one: a kind of method that electrolytically recovers gold from cyanogen-containing gold-plating waste liquid, mainly is made up of following steps:

[0029] The process flow is attached figure 1 Shown, take the cyanide-containing gold-plating waste liquid that produces on the PCB gold-plating process as object, after measuring, gold content is 850mg / l in the waste liquid, and this electrolytic gold method comprises the following steps:

[0030] Step 1: Preprocessing

[0031] Add 1Kg glucose to 100L cyanide-containing gold-plating waste solution, fully dissolve and react for a period of time, put a gold waste plate of known weight into it for about 10 minutes, take it out, dry it, dry it, weigh it, and it is equivalent to the weight before putting it in, prove This waste liquid has no activity and can be electrolyzed. The purpose of adding glucose is: the cyanide-containing gold stripping solution produced in industrial production or the washing water of the...

Embodiment 2

[0050] Embodiment two: a kind of method for electrolytically recovering gold from cyanogen-containing gold-plating waste liquid, it is characterized in that: mainly be made up of following steps:

[0051] Step 1: Preprocessing

[0052] Adding glucose to the cyanide-containing gold-plating waste liquid, so that the glucose and the oxidant in the cyanide-containing gold-plating waste liquid undergo a sufficient oxidation-reduction reaction to obtain a cyanide-containing gold-plating waste liquid without oxidation activity, wherein the gold in the cyanide-containing gold-plating waste liquid The content range of ions is 500mg / l;

[0053] The second step: electrolytic gold

[0054] In the electrolytic cell, the cyanide-containing gold plating waste liquid obtained in the first step without oxidation activity is adjusted to a pH value of 9, and an electrode system arranged in the electrolytic cell is used for electrolysis operation, and gold atoms are deposited on the cathode;

...

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Abstract

The invention relates to a method for recovering gold from waste cyanogen-containing gold-plating liquid by electrolysis, aiming at waste cyanides-containing gold-plating liquid which is generated in a gold-plating work section in a PCB production process. The waste liquid contains cyanogen with a certain concentration and the noble metal gold, thus if the waste liquid is directly drained into environment, severe pollution can be caused, and meanwhile, the waste liquid has higher recovery values. The method for recovering gold by electrolysis is adopted, and the recovery rate of the noble metal gold reaches above 95 percent. The content of the gold in waste electrolyte is reduced to be below 5ppm, and the resource recycling of the waste gold-plating liquid is realized. Meanwhile, the concentration of the cyanogen in the waste liquid is also reduced by electrolyzing the cyanogen, thereby reducing the heavy burdens of the subsequent treatment of the waste liquid and truly achieving the win-win purpose of environmental benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for recovering gold, in particular to a method for electrolytically recovering gold from cyanide-containing gold plating waste liquid. Background technique [0002] In the past ten years, with the steady growth of the world's electronics industry, China's printed circuit board (Printed Circuit Board, PCB for short) manufacturing industry has also developed rapidly with a growth rate of more than 20%. In the PCB manufacturing process, it is necessary to use a variety of chemical raw materials and chemical solutions of different properties, resulting in different types of pollutants, including heavy metal compounds, synthetic polymer organics and various organic additives. PCB companies at home and abroad generally Only the alkaline (or acidic) etching solution with high recovery value is sold to qualified companies for recycling, and other waste solutions are comprehensively treated through the wastewater workshop. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02
Inventor 邵正锋徐丽霞郭菊花
Owner 苏州天地环境科技有限公司
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