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Process for deplating gold plated layer and recovering gold with cyanide-free gold stripping powder

A gold-plated layer and gold-removing technology, which is applied in the field of gold recycling of gold-plated parts, can solve the problems of easy production of toxic gases and pollutants, great harm to operators and the environment, and achieve low price, simple and easy-to-understand operation, and no pollution Effect

Active Publication Date: 2014-03-26
王金良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing gold stripping technology is to use a solution of sodium cyanide or potassium cyanide to strip the gold coating. Both sodium cyanide and potassium cyanide are highly toxic. During the operation, toxic gases and pollutants are easily produced. Extremely hazardous to operators and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of degold powder

[0021] The solid gold ore dressing agent, solid sodium carbonate and solid sodium citrate are crushed into powder with a pulverizer according to the ratio of 5:3:2 to make degold powder.

[0022] (2) Preparation of gold removal solution

[0023] Add pure water into the container, then add degold powder in a ratio of 100:3, stir until dissolved, and configure a degold solution with a concentration of 2.9%, then put gold-plated parts or metal with a gold-plated layer into the degold solution, Stand still for 5 minutes, until the gold-plated layer on the metal surface completely falls off, filter the degold solution, remove impurities and wait for the next use.

[0024] (3) Zinc paper replacement

[0025] According to the ratio of 1000:1, add sodium hydroxide to the degold solution and stir evenly. At the same time, add citric acid to the degold solution of the same quality according to the ratio of 100:2 and stir until it is completely...

Embodiment 2

[0029] (1) Preparation of degold powder

[0030] The solid gold ore dressing agent, solid sodium carbonate and solid sodium citrate are crushed into powder with a pulverizer according to the ratio of 5:3:2 to make degold powder.

[0031] (2) Preparation of gold removal solution

[0032] Add pure water to the container, then add degold powder in a ratio of 100:4, stir until dissolved, and configure a degold solution with a concentration of 3.8%, then place gold-plated parts or metal with a gold-plated layer into the degold solution, Let it stand for 20 seconds until the gold-plated layer on the metal surface comes off completely.

[0033] (3) Zinc paper replacement

[0034] According to the ratio of 1000:1, add sodium hydroxide to the degold solution and stir evenly. At the same time, add citric acid to the degold solution of the same quality according to the ratio of 100:2 and stir until it is completely dissolved. Mix and stir the two solutions. Put zinc paper into the gol...

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PUM

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Abstract

The invention belongs to the technical field of gold recovery of gold plated parts, and discloses a process for deplating a gold plated layer and recovering gold with cyanide-free gold stripping powder. A solid gold ore separation agent, solid sodium carbonate and sold sodium citrate are made into the gold stripping powder at the ratio of 5:3:2, water and the gold stripping powder are prepared into gold stripping liquid with the concentration of 2.9%-3.8% according to the ratio of 100:(3-4), a gold plating part or gold layer plating metal is put into the gold stripping liquid for soaking to strip gold, and the processes of zinc paper replacement, zinc removal and crucible smelting are carried out to obtain gold the purify of 99.9%. The process is improved through research, the mixture of the nontoxic and cheap ore separation agent, solid sodium carbonate and sold sodium citrate is used to replace a sodium cyanide or editpotassium cyanide solution to carry out deplate the gold plated layer, and the invention provides the process which has no pollution, is simple to operate and easy to understand, and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of gold recycling of gold-plated parts, and in particular relates to a process for removing a gold-plating layer by a cyanide-free degold powder and recovering gold. Background technique [0002] With the rapid development of society, the replacement speed of electronic products is gradually accelerating, which brings a large number of waste electronic components, gold-plated waste circuit boards, and unqualified gold-plated parts in electroplating factories. To reduce the waste of resources, the reuse of gold on the surface of gold-plated parts has become very necessary. [0003] The existing gold stripping technology is to use a solution of sodium cyanide or potassium cyanide to strip the gold coating. Both sodium cyanide and potassium cyanide are highly toxic. During the operation, toxic gases and pollutants are easily produced. It is extremely harmful to operators and the environment. Contents of the ...

Claims

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Application Information

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IPC IPC(8): C23F1/10C22B11/00C22B3/46
CPCY02P10/20
Inventor 王金良
Owner 王金良
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