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Thiosulfate gold leaching method using cobalt and ethylene diamine tetraacetic acid (EDTA) as catalysts

A technology of ethylenediaminetetraacetic acid catalyzing sulfur and ethylenediaminetetraacetic acid is applied in the direction of improving process efficiency, which can solve the problems of long leaching period, highly toxic cyanide, slow gold leaching speed, etc., and achieves no threat to the environment, Environmentally friendly and energy-saving effects

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it has three major defects: (1) cyanide is highly toxic, which seriously threatens the ecological environment and human health; (2) the effect of leaching gold on refractory gold ores is poor, and more than one-third of my country's gold ore resources are embarrassing (3) The speed of leaching gold is slow, the leaching cycle is long, and the utilization efficiency of equipment is low
[0007] In order to solve the problems of high leaching agent consumption and ammonia threat to the environment existing in the current thiosulfate method for leaching gold, the present invention is specially proposed

Method used

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  • Thiosulfate gold leaching method using cobalt and ethylene diamine tetraacetic acid (EDTA) as catalysts
  • Thiosulfate gold leaching method using cobalt and ethylene diamine tetraacetic acid (EDTA) as catalysts

Examples

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Effect test

Embodiment 1

[0024] Example 1: In the pulp as described in Comparative Example 1, first add cobalt sulfate and EDTA to 0.005mol / L and 0.01mol / L respectively, then adjust the pH of the pulp to 7.0 with sodium hydroxide, and then add sodium thiosulfate to 0.10mol / L, and adjust the slurry pH with sodium hydroxide again to be 9.0, and leaching 8.0h under the same conditions as the control example 1 under other leaching conditions, the leaching rate of gold is 88.5%, and the consumption of sodium thiosulfate is 4.13kg / t 原料 .

Embodiment 2

[0025]Example 2: In the pulp as described in Comparative Example 1, first add cobalt sulfate and EDTA to 0.015mol / L and 0.03mol / L respectively, then adjust the pH of the pulp to 8.0 with sodium hydroxide, and then add sodium thiosulfate to 0.30mol / L, and adjust the slurry pH with sodium hydroxide again to be 10.0, and leaching 13.0h under the same conditions of other leaching conditions and comparative example 1, the leaching rate of gold is 89.7%, and the consumption of sodium thiosulfate is 4.62kg / t 原料 .

Embodiment 3

[0026] Example 3: In the pulp as described in Comparative Example 1, first add cobalt sulfate and EDTA to 0.03mol / L and 0.06mol / L respectively, then adjust the pH of the pulp to 8.5 with sodium hydroxide, and then add ammonium thiosulfate to 0.60mol / L, and adjust the pulp pH with sodium hydroxide again to be 10.5, and leaching 18.0h under the conditions identical to that of comparative example 1 under other leaching conditions, the leaching rate of gold is 89.1%, and the consumption of ammonium thiosulfate is 5.84kg / t 原料 .

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Abstract

The invention discloses a thiosulfate gold leaching method using cobalt and ethylene diamine tetraacetic acid (EDTA) as catalysts. The thiosulfate gold leaching method is characterized in that the cobalt and EDTA are used to replace traditional copper and ammonia for catalyzing, that is to say, cobalt sulfate and EDTA instead of copper sulfate and ammonia water are added into ore pulp. A thiosulfate method which is nontoxic and cheap in leaching agent, fast in gold leaching, low in equipment corrosion due to the fact that gold leaching is performed in an alkaline medium, and the like is widely believed to be the most promising non-cyanidation gold leaching method, but the thiosulfate method has the problems of large leaching agent consumption caused by the fact that Cu(NH3)4<2+> oxidizes S2O3<2-> and environment threatening caused by ammonia use. The thiosulfate gold leaching method has the advantages that the method can evidently reduce the consumption of thiosulfate, avoid ammonia water's threat to environments, and the gold leaching rate of the method is equivalent to that of a traditional method using copper and ammonia as catalysts.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for leaching gold with cobalt and ethylenediaminetetraacetic acid (EDTA) catalyzed by thiosulfate. Background technique [0002] At present, the cyanidation method occupies a dominant position in the gold extraction industry for a long time because of its mature technology and simple process. But it has three major defects: (1) cyanide is highly toxic, which seriously threatens the ecological environment and human health; (2) the effect of leaching gold on refractory gold ores is poor, and more than one-third of my country's gold ore resources are embarrassing (3) The gold leaching speed is slow, the leaching cycle is long, and the equipment utilization efficiency is low. Therefore, the development of non-cyanidation gold leaching technology is of great significance. Among the non-cyanidation technologies, the thiosulfate method has the advantages of non-toxic a...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B11/00
CPCC22B3/08C22B11/04Y02P10/20
Inventor 徐斌李骞刘晓亮姜涛杨永斌闵欣李光辉郭宇峰范晓慧张元波许斌陈许玲彭志伟甘敏杨凌志
Owner CENT SOUTH UNIV
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