Method for extracting gold from gold-products containing iron and copper
DOI:
https://doi.org/10.15587/1729-4061.2012.5572Keywords:
Gold-containing product, iron, copper, preliminary caustic processing, ammonium cyanide method of dissolutionAbstract
We suggest a way of gold extraction from iron and copper containing products, which is one of the major challenges of gold mining industry of XXI century. As a rule, the presence of iron reduces the efficiency of processes and performances of gold extraction due to the high consumption of cyanide. This creates the necessity of additional processes of the transformation of iron into an insoluble form, and the intensification of the cyanide process. In this regard, we suggest the results of research on preliminary processing of the gold-containing product with caustic soda in the laboratories with ultrasonic transducers to increase the content of dissolved oxygen.
We studied the effect of oxygen on the rate of transformation of iron into the form insoluble in cyanide solutions. Another important factor, which influences the gold extraction and high consumption of cyanide, is the presence of copper minerals in gold-containing products. Copper consumes large amount of cyanide. Copper cyanide is more stable than free cyanide, and it is harmful for the environment. In this regard, we suggest ammonium cyanide method of extraction of gold from the copper-containing products. The optimal conditions for the dissolution of gold from copper-containing products in ammonium cyanide solutions were determined.
We studied the effect of copper and ammonia on the kinetics of gold extraction. We showed that the presence of ammonia in the solution reduces the amount of cyanide consumed to 0.7 kg / t without changing the performances of gold extraction. The article represents the results of study of gold sorption from ammonium cyanide solutions using activated carbon NWS G6 * 12 and resin AuRIX ® 100 as well as the advantage of the sorption properties of coal compared to resinsReferences
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