Method for extracting gold from alkaline cyanide solution

Abstract

The invention discloses a method for extracting gold from alkaline cyanide solution. Porous graphitized carbon black and surfactant acetone solution with the concentration of 10 percent are evaporated in a water bath by stirring, thereby obtaining a graphitized carbon black packing with the attached surfactant. The packing is arranged in a solid-phase extraction column for compaction and washed by dilute sodium hydroxide with pH of 9.4-13 for standby. Gold-containing material liquid passes through the extraction column at the flow rate of 10-100mL / min for extraction and enrichment, then eluate is further used for reverse elution, and the gold in the eluate is finally recovered by the electric deposition method. The method has small environmental pollution, the operable pH range is very wide, the one-time extraction rate of the gold exceeds 96.5 percent, the enrichment times are more than 250 times, and the extraction capacity of the material to the gold is greater than 29mg / g, therebyhaving a good industrial application prospect.

Description

A kind of method for extracting gold from alkaline cyanide solution technical field The invention belongs to the field of hydrometallurgy, and in particular relates to a method for extracting gold from alkaline cyanide solution by using solid-phase extraction technology. Background technique The cyanidation method has been applied to the gold extraction process at the beginning of the last century. Because of its high recovery rate, simple process, and low unit cost, it has rapidly spread to gold mines all over the world, bringing human gold extraction technology into a new pioneering stage. At present, most of the treatment processes for gold enrichment in cyanidation leachate adopt the traditional zinc powder replacement method or activated carbon adsorption. Since the selectivity of these two methods to gold is not high enough, the obtained gold mud (intermediate product) still needs to undergo more complex follow-up refining treatment, resulting in long production cycl...

AI Technical Summary

Problems solved by technology

Among them, when octadecyl bonded silica gel (C18) is used to extract gold in alkaline cyanide solution, its enrichment multiple and extraction recovery rate are unmatched by traditional liquid-liquid extraction techniques

But at the same time, it is also found that the applicable pH of the reversed-phase bonded silica stationary phase is narrow (pH2-8, and the pH range of special bonded silica can reach 1-12), and the use stability is poor under alkaline conditions, and it is easy to fail

Moreover, the price of reverse-phase bonded silica gel is high, exceeding ten thousand yuan per kilogram, and the cost is difficult to be accepted by the production unit. Reversed-phase solid-phase extraction materials that are highly stable and can be used repeatedly under alkaline conditions become the key to the technology

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