Gold stripping composition and using method thereof

Abstract

The invention relates to a gold stripping composition and a using method thereof. The gold stripping composition provided by the invention is formed by stripping gold from a base material; the composition comprises one or more gold stripping compounds and a conduction assisting compound, wherein the gold stripping compounds can from covalent bonding with gold, thus the gold on the base material is stripped off; and through the effects of the conduction assisting compound, voltage can be lowered and the gold stripping can be completed without causing damage to the base material, wherein the composition does not contain any cyanide. The invention also provides a using method of the gold stripping composition. According to the conventional gold stripping method, relative risk is caused to operating personnel, and the waste liquid during the process is troublesome to treat, additionally the base material can be damaged, and both the gold stripping speed and gold dissolving quantity have room for improvement. In view of the issue, the invention tries to provide a gold stripping technology without cyanide, not only can the gold be recovered effectively, multiple problems encountered by the prior art can be prevented.

Description

technical field [0001] The invention relates to a gold stripping composition, in particular to a gold stripping composition for stripping gold from a base material and a method for using the gold stripping composition. Background technique [0002] With the prosperity and development of the electronic industry, the electronic waste recycling industry has also emerged, especially with the recent sharp rise in the price of metal raw materials, the recycling of metal waste has received greater attention, and many operators have also invested more Capital, committed to improving the efficiency and purity of recycled materials. Among them, in terms of recycling precious metals, such as gold-plated printed circuit boards, gold fingers, flexible substrates, lead frames, and components, etc., gold waste can be recycled through the recycling process. [0003] In the traditional technical field, since gold (Gold) is a precious metal with high chemical stability, it is not easy to be ...

AI Technical Summary

Problems solved by technology

Waste liquid must be diluted about 500 times before treatment, which will increase water consumption and cost, and at the same time, trace precious metals will be mixed into sludge and cannot be recycled

In particular, it should be emphasized that during the gold stripping process, volatile and toxic cyanide is easily produced, which will prevent the exchange of human tissue cells with oxygen, cause cell death, and cause great harm to the heart and brain. It is a regulated highly toxic substance, so a little carelessness will endanger the operator

[0006] In addition to the above-mentioned hazards to personnel, gold stripping with aqua regia or chemical stripping methods based on cyanide will damage the substrate, especially aqua regia will completely corrode the substrate, so the gold-plated defective products of continuous electroplating terminals cannot be reprocessed , only gold can be recovered, while the substrate fails due to damage

[0007] In addition, and using the above two chemical substances to strip gold, the stripping speed has a lot of room for improvement, especially cyanide is slower; and the amount of gold dissolved by the above two chemical substances stripping gold is not high, which is also a Issues to be improved

[0008] Due to the existing gold stripping methods, there are considerable risks for the operators, and the waste liquid treatment in the process is also troublesome, and it will damage the substrate, so there is room for improvement in the gold stripping speed and the amount of gold dissolved.