Method for recycling gold in situ from gold-containing wastewater

Abstract

The invention discloses a method for recycling gold in situ from gold-containing wastewater. The method is free of pollution, simple in process and convenient and rapid to implement, and intermediate consumables can be reutilized. The technological method of resin adsorption, gold-loaded resin desorption, diaphragm electrodeposition and barren resin gold adsorption is adopted, so that the process has the advantages of being high in production efficiency, low in production cost, free of wastewater transfer cost, thorough in gold recycling and the like; enrichment, elution desorption and electrolysis are carried out in situ, gold recycling is achieved, and the risk of wastewater transfer is avoided. According to the method, chelate resin is adopted to adsorb gold, an acidic thiourea system is adopted to carry out elution desorption on gold-loaded resin, barren resin obtained after desorption is returned to adsorb gold, gold in a pregnant solution obtained after desorption is extracted with a diaphragm electrodeposition method, a barren solution obtained after electrolysis is returned and used for desorbing the gold-loaded resin, and thus the technological process with the gold adsorption resin and the desorption solution reused is formed. When the method is applied to wastewater containing minor gold or trace gold, gold can be thoroughly recycled, and the gold residual in the barren solution can be reduced to 0.001 ppm and is almost zero.

Description

technical field [0001] The invention relates to a method for recovering gold from gold-containing wastewater, in particular to a method for recovering gold in situ by adopting a process of resin adsorption-gold-loaded resin desorption-diaphragm electrowinning. Background technique [0002] In recent years, the electronic information technology industry has developed rapidly, and the speed of upgrading electronic products is getting faster and faster. At the same time, with the improvement of people's living standards, the strong demand for gold-plated parts has led to a sharp increase in the amount of electronic waste and gold-plated parts waste. If the contained rare and precious metals are not recovered, it will not only cause serious pollution to the environment, but also cause a great waste of resources. The development of the above-mentioned industries will produce a large amount of gold-containing waste water, such as: waste plating solution produced during electropla...

AI Technical Summary

Problems solved by technology

[0005] Activated carbon and resin adsorption methods can recover gold more completely, but the existing technology is to extract gold by incinerating activated carbon or resin adsorbed with gold, which will cause serious secondary pollution;

[0006] Electrodeposition method is a research hotspot in recent years. It has high gold extraction efficiency and high gold recovery purity, but the ordinary electrolysis process is prone to concentration polarization.

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