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Copper-catalyzed glycine-thiosulfate composite gold leaching process

A technology of thiosulfate and catalyzed glycine, applied in the direction of improving process efficiency, etc., can solve the problems of large consumption of reagents, slow leaching kinetics, toxicity, etc., to solve toxicity problems and safety problems, weaken oxidation decomposition, The effect of accelerating the leaching process

Active Publication Date: 2021-06-15
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes also weaken the catalytic effect of metal complexes on the thiosulfate gold leaching process, and the essential mechanism of leaching gold is only thiosulfate as the single leaching agent of gold, which is very important for reducing the consumption of thiosulfate. limited capacity
[0010] Therefore, in the existing thiosulfate gold leaching process, there are often problems such as large reagent consumption, toxicity, poor stability, and slow leaching kinetics that need to be solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A copper catalyzed glycine-thiosulfate composite gold leaching process of the present invention, the specific process is as follows:

[0038] (1) Grinding the gold ore raw material, so that the part with a particle size less than 0.074mm in the gold ore raw material accounts for 90wt%, and then adjusts the pulp concentration to 10%;

[0039] (2) Add copper sulfate, glycine and potassium thiosulfate to the pulp until the initial concentration of copper sulfate is 0.001mol / dm 3 , the initial concentration of glycine is 0.005mol / dm 3 , the initial concentration of potassium thiosulfate is 0.2mol / dm 3 , and adding sodium hydroxide to adjust the pH value of the pulp to 10.0, and then carry out stirring and leaching, the stirring speed is 100r / min, the temperature of the pulp is 20°C, and leaching is performed for 12 hours. Record and measure the leaching results: the leaching rate of gold is 81.2%, and the consumption of sodium thiosulfate is 2.9kg / t 金矿 .

Embodiment 2

[0041] A copper catalyzed glycine-thiosulfate composite gold leaching process of the present invention, the specific process is as follows:

[0042] (1) Grinding the gold ore raw material until the part with a particle size of less than 0.074mm in the gold ore raw material accounts for 90wt%, adjusting the slurry concentration to 25%;

[0043] (2) Add copper sulfate, glycine and sodium thiosulfate to the pulp until the initial concentration of copper sulfate is 0.01mol / dm 3 , the initial concentration of glycine is 0.05mol / dm 3 , the initial concentration of sodium thiosulfate is 0.1mol / dm 3 , and adding sodium hydroxide to adjust the pH value of the pulp to 11.0, and then carry out stirring and leaching in an air atmosphere, the stirring speed is 300r / min, the temperature of the pulp is 55°C, and leaching is carried out for 9 hours. The leaching results are: the leaching rate of gold is 88.5%, and the consumption of sodium thiosulfate is 3.4kg / t 金矿 .

Embodiment 3

[0045] A copper catalyzed glycine-thiosulfate composite gold leaching process of the present invention, the specific process is as follows:

[0046] (1) Grinding the gold ore raw material until the part with a particle size of less than 0.074mm in the gold ore raw material accounts for 90wt%, adjusting the slurry concentration to 25%;

[0047] (2) Add copper sulfate, glycine and ammonium thiosulfate to the pulp until the initial concentration of copper sulfate is 0.05mol / dm 3 , the initial concentration of glycine is 0.25mol / dm 3 , the initial concentration of ammonium thiosulfate is 0.05mol / dm 3 , and adding sodium hydroxide to adjust the pH value of the pulp to 12.0, and then carry out stirring leaching in an air atmosphere, wherein the stirring speed is 300r / min, the temperature of the pulp is 75°C, and the leaching time is 6 hours. The leaching results are: the leaching rate of gold is 90.4%, and the consumption of sodium thiosulfate is 3.9kg / t gold 矿 .

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Abstract

The invention discloses a copper-catalyzed glycine-thiosulfate composite gold leaching process. The process comprises the following steps of adding copper sulfate, glycine or / and metal salt thereof and thiosulfate into gold ore pulp, adjusting the pH value of the ore pulp to 10.0-13.0, and then stirring and leaching to complete the gold leaching process. According to the process, in the copper-catalyzed glycine-thiosulfate composite gold leaching process, the glycine or the metal salt thereof is introduced, the glycine or the metal salt thereof can form a copper-glycine chelate with higher stability with Cu<2+> to stabilize copper in a solution, so that the oxygenolysis effect of a copper complex on thiosulfate radicals is weakened, the stability of a gold leaching system is improved, and the consumption of reagents is reduced; and the glycine or the metal salt of the glycine can also play a role of the gold leaching agent together with thiosulfate radicals, so that the consumption of thiosulfate can be further effectively reduced, and the consumption of thiosulfate is reduced to be below 4kg / t gold ore.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a copper-catalyzed glycine-thiosulfate composite gold leaching process. Background technique [0002] The cyanidation process has become the mainstream method for ore gold extraction in the gold industry because of its low cost, mature process, and simple process. With the continuous promulgation and improvement of laws and regulations on environmental protection, the environmental protection and safety problems caused by the use of highly toxic cyanide in the cyanidation process have become increasingly prominent. Moreover, the cyanidation process cannot effectively treat refractory gold ores such as copper-gold ore and carbonaceous gold ore, resulting in an increasingly urgent demand for research and development of non-cyanidation gold leaching processes. [0003] Among the non-cyanidation processes, the thiosulfate leaching process is considered to be the most promisi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/16
CPCC22B11/04C22B3/16Y02P10/20
Inventor 王剑潘玥
Owner JIANGXI UNIV OF SCI & TECH
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