Coupling gold-extracting process for high-sulfur and high-iron arsenic-containing refractory gold concentrates

Abstract

The invention relates to a coupling gold-extracting process for high-sulfur and high-iron arsenic-containing refractory gold concentrates. The coupling gold-extracting process is carried out accordingto the following steps and conditions that biological oxidation is conducted, specifically, pulp-mixing is conducted, a 9k iron-free culture medium and mineral leaching microorganisms of a high-acid-resistant and arsenic-resistant strain are added, then, two-stage biological oxidation is conducted, and the temperature and the oxidation time are controlled; dense washing is conducted, specifically, second-stage biological oxidation mineral pulp is subjected to dense washing, countercurrent washing with the grade being 3-4 is conducted, and lime milk overflows into an oxidation solution to conduct a neutral reaction; flotation is conducted, specifically, sodium lignin sulfonate and xanthate are added for flotation; and cyaniding is conducted, specifically, lime milk, sodium cyanide and activated carbon are added in the gold flotation concentrates, the cyaniding pH value, the carbon density and the cyaniding time are controlled, gold-loading carbon and cyanide slag are obtained, and thegold-loading carbon is put into a gold-loading carbon refining system for extracting gold. According to the coupling gold-extracting process, the situation that part of unoxidized sulfide enters a cyaniding system can be avoided, and the situation that cyanide and thiocyanide enter a biological oxidation working section to recycle the part of gold-containing unoxidized sulfide is eliminated; and the coupling gold-extracting process has the advantages that the production cost is low, the investment is less, the equipment is simple, the process is coupled simply, biological oxidation operation is stable, the gold comprehensive recovery is high, and environmental friendliness is achieved, and is suitable for application of extracting gold from the high-sulfur and high-iron arsenic-containingrefractory gold concentrates.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a coupled gold extraction process for high-sulfur iron-arsenic-containing refractory gold concentrate, which is suitable for gold extraction from high-sulfur iron-arsenic-containing refractory gold concentrate. Background technique [0002] High-sulfur iron-containing arsenic-containing refractory gold concentrate, industry insiders mean that gold is wrapped or impregnated in fine particles in pyrite, arsenopyrite, realgar, orpiment, arsenopyrite and other minerals, and the sulfur grade is > 30%. Grade > 30%, refractory gold concentrate containing more than 2% arsenic. With the depletion of a small amount of easy-to-treat ores, people are strengthening the mining of a large number of refractory ores. Among them, the high-sulfur iron-containing arsenic-containing refractory gold concentrate has become an important intermediate product of gold resources. For such refr...

AI Technical Summary

Problems solved by technology

With the depletion of a small amount of easy-to-treat ores, people are strengthening the mining of a large number of refractory ores. Among them, the high-sulfur iron-containing arsenic-containing refractory gold concentrate has become an important intermediate product of gold resources. For such refractory gold-bearing materials , the industry generally adopts three methods of roasting, biology, and hot pressing to pretreat it first, and then extract gold by cyanide extraction (CIL), but there are generally high production costs, large investment, complex equipment, environmental pollution, and extraction of gold Problems such as poor gold effect

[0003] In order to solve the above problems, some people use the coupled gold extraction process of biological oxidation-cyanidation gold extraction to treat high-sulfur iron-containing arsenic-containing refractory gold concentrates, which can play a certain role in reducing production costs, reducing investment, simplifying equipment, and reducing environmental pollution. , but due to the inherent characteristics of high-sulfur and high-iron arsenic in this kind of ore, it is difficult to oxidize completely due to biological oxidation. Residual gold, because the residual cyanide and thiocyanate in the cyanide slag not only affect the flotation recovery of the unoxidized part of the gold-containing sulfide, but also the residual cyanide and thiocyanate brought by the gold concentrate after flotation directly affect the biological oxidation. stable operation, resulting in a low comprehensive recovery rate of gold

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