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
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[0019] Example 1:
[0020] (1) Preparation of de-gold powder
[0021] The solid gold ore dressing agent, solid sodium carbonate and solid sodium citrate are pulverized into powder with a pulverizer in a ratio of 5:3:2 to prepare de-gold powder.
[0022] (2) Preparation of gold removal solution
[0023] Add pure water to the container, then add the degold powder according to the ratio of 100:3, stir until it dissolves, configure it into a degold solution with a concentration of 2.9%, and then place the gold-plated parts or the metal with a gold-plated layer into the degold solution. Let it stand for 5 minutes, and when the gold-plated layer on the metal surface is completely peeled off, filter the gold-removing solution to remove impurities for next use.
[0024] (3) Zinc paper replacement
[0025] Add sodium hydroxide to the de-gold solution at a ratio of 1000:1 and stir evenly. At the same time, add citric acid with the same quality of de-gold solution in a ratio of 100:2 and stir unti...
Example Embodiment
[0028] Example 2:
[0029] (1) Preparation of de-gold powder
[0030] The solid gold ore dressing agent, solid sodium carbonate and solid sodium citrate are pulverized into powder with a pulverizer in a ratio of 5:3:2 to prepare de-gold powder.
[0031] (2) Preparation of gold removal solution
[0032] Add pure water to the container, then add the degold powder according to the ratio of 100:4, stir until it dissolves, configure it into a degold solution with a concentration of 3.8%, and then place the gold-plated parts or the 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 is completely peeled off.
[0033] (3) Zinc paper replacement
[0034] Add sodium hydroxide to the de-gold solution at a ratio of 1000:1 and stir evenly. At the same time, add citric acid with the same quality of de-gold solution in a ratio of 100:2 and stir until it is completely dissolved. Mix and stir the two solutions. Put zinc ...
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