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Method for reducing consumption of thiosulfate in gold leaching system

A technology of thiosulfate and sodium thiosulfate, which is applied in the thiosulfate gold extraction process, reduces the consumption of thiosulfate in the gold leaching system, can solve the problems of large consumption of thiosulfate and the like, and achieves cost reduction. Low, efficient, easy-to-control effects

Inactive Publication Date: 2013-11-27
CENT SOUTH UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of large consumption of thiosulfate in the leaching process of the copper-ammonia-thiosulfate gold leaching system, and to provide a method that can significantly reduce the amount of thiosulfate without affecting the gold leaching rate. Methods of Sulfate Depletion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: add humic acid 20mg / dm in the pulp of above-mentioned comparative example 3 , stirring and leaching for 4 hours, the gold leaching rate was 77.6%, and the consumption of sodium thiosulfate was reduced to 18kg / t ore.

Embodiment 2

[0026] Embodiment 2: add humic acid 40mg / dm in the pulp of above-mentioned comparative example 3 , stirring and leaching for 4 hours, the gold leaching rate was 78.1%, and the consumption of sodium thiosulfate was reduced to 18.7kg / t ore.

Embodiment 3

[0027] Embodiment 3: add humic acid 60mg / dm in the pulp of above-mentioned comparative example 3 , stirring and leaching for 4 hours, the gold leaching rate was 78.8%, and the consumption of sodium thiosulfate was reduced to 21.6kg / t ore.

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Abstract

The invention provides a method for reducing consumption of thiosulfate in a gold leaching system. According to the method, the additive is humic acid extracted from coal and adopting fulvic acid , and humin acid as main components; during application, the humic acid is added into a copper-ammonia-thiosulfate system, wherein the adding amount of the humic acid is in the range of 20-120 mg / dm3, preferably 80mg / L, the copper-ammonia-thiosulfate system comprises 0.01-0.05mol / dm<3> of copper (II) ion, 0.3-2mol / dm <3> of aqua ammonia and 0.3-1mol / dm <3> of thiosulfate, and the pH value of pulp is 10-11. By using the leaching solution (namely the copper-ammonia-thiosulfate) to extract gold from ore, the consumption of the thiosulfate can be remarkably reduced on the premise of not affecting the leaching rate of gold.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, relates to a process for extracting gold with thiosulfate, and more specifically relates to a method for reducing consumption of thiosulfate in a gold leaching system. Background technique [0002] Cyanide is currently the main method for extracting gold. However, the sodium cyanide used in the cyanide process is a highly toxic chemical, which is very unsafe for operators and may cause serious environmental problems. In recent years, some countries and regions have banned the use of cyanide in gold extraction as countries start from the perspective of people-oriented security and pay more and more attention to environmental issues. Moreover, for refractory gold ores, the leaching effect of the cyanidation method is relatively poor. Therefore, the non-cyanidation method of gold extraction has increasingly become a hot research field. [0003] In non-cyanidation gold extraction technology,...

Claims

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Application Information

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IPC IPC(8): C22B3/14C22B3/16C22B11/00
CPCY02P10/20
Inventor 杨永斌姜涛李骞范晓慧李光辉郭宇峰陈许玲张元波王丹张茜
Owner CENT SOUTH UNIV
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