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A composite sulfate catalyzed citric acid-thiosulfate gold leaching process

A sulfate-catalyzed citric acid and thiosulfate technology, applied in the field of hydrometallurgy, can solve the problems of large consumption of thiosulfate, high sensitivity without improvement, ammonia toxicity and pollution, and achieve enhanced practical application Sexuality, resolution of sensitivities, attenuation of responsiveness

Active Publication Date: 2020-08-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that Ni 2+ It is highly carcinogenic to the human body and the discharge of nickel will cause water, soil and air pollution
In addition, this process does not improve the disadvantages of the high sensitivity of the gold leaching rate to the leaching temperature and pH value in the traditional copper ammonia thiosulfate leaching process
[0008] Therefore, it is the current wet method to solve the problems of large consumption of thiosulfate, high toxicity and pollution of ammonia, and high sensitivity of gold leaching rate to leaching temperature and pH value in the traditional thiosulfate gold leaching process. Technical Problems Urgently Needed to be Solved in Metallurgical Industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The gold ore raw material is subjected to ore grinding treatment until the part with a particle size of less than 0.074mm in the gold ore raw material accounts for 90wt%, the concentration of the pulp is adjusted to 25%, and the concentration of the composite sulfate formed by adding copper sulfate and iron sulfate to the pulp is adjusted to 0.001mol / dm 3 , citric acid concentration to 0.002mol / dm 3 , sodium thiosulfate to 0.2mol / dm 3 , and adjust the pH value of the pulp to 7.0, the stirring speed to 300r / min, the pulp temperature to 20°C, and the leaching time to 14 hours. The leaching results are: the leaching rate of gold is 82.4%, and the consumption of sodium thiosulfate is 0.9kg / t 金矿 .

Embodiment 2

[0045] Embodiment 2: the gold ore raw material is subjected to ore grinding treatment, until the part with a particle size of less than 0.074mm in the gold ore raw material accounts for 90wt%, the concentration of the pulp is adjusted to 35%, and the concentration of composite sulfate formed by adding copper sulfate and iron sulfate to the pulp is added to 0.01mol / dm 3 , sodium citrate concentration to 0.05mol / dm 3 , potassium thiosulfate to 0.2mol / dm 3 , and adjust the pH of the slurry to 8.0, the leaching temperature to 70°C, the stirring speed to 400r / min, and the leaching time to 13 hours. The leaching results are as follows: the leaching rate of gold is 91.5%, and the consumption of sodium thiosulfate is 2.2kg / t 金矿 .

Embodiment 3

[0046] Embodiment 3: the gold ore raw material is subjected to ore grinding treatment, until the part with a particle size of less than 0.074mm in the gold ore raw material accounts for 90wt%, the pulp concentration is adjusted to 40%, and the composite sulfate concentration formed by adding copper sulfate and iron sulfate to the pulp to 0.05mol / dm 3 , citric acid concentration to 0.1mol / dm 3 , ammonium thiosulfate to 0.2mol / dm 3 , and adjust the pH value of the pulp to 10.0, the leaching temperature to 80°C, the stirring speed to 400r / min, and the leaching time to 8 hours. The leaching results are: the leaching rate of gold is 94.4%, and the consumption of sodium thiosulfate is 3.1kg / t 金矿 .

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Abstract

The invention provides a composite sulfate catalyzed citric acid-thiosulfate gold leaching process. The process comprises the steps that gold-ore raw materials are subjected to ore grinding treatment,and then the ore slurry concentration is adjusted to range from 10% to 40%; and composite sulfate, citric acid or / and sodium citrate and thiosulfate are sequentially added into the ore slurry, the pHvalue of the ore slurry is adjusted to range from 7.0 to 12.0, stirring is conducted, and gold-ore leaching is conducted at the temperature ranging from 20 DEG C to 90 DEG C, wherein the leaching time ranges from 3.0 h to 14.0 h. According to the composite sulfate catalyzed citric acid-thiosulfate gold leaching process, on the premise that the gold leaching rate is not decreased, or even the goldleaching rate is increased, consumption of the thiosulfate can be significantly reduced, and the gold leaching process is completely efficient and clean and high in applicability.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a composite sulfate catalyzed citric acid-thiosulfate gold leaching process. Background technique [0002] The cyanidation method has become the most widely used gold extraction method in the gold industry because of its simple process, mature technology, and low cost. In recent years, with the continuous increase of environmental protection in various countries and the continuous improvement of people's environmental awareness, a series of environmental protection, cost and safety problems caused by the use of highly toxic reagent cyanide in the gold industry have become increasingly prominent. In addition, the cyanide method cannot treat some refractory gold ores economically and effectively, so the non-cyanide gold leaching process has been developed rapidly. Among many non-cyanide reagents, thiosulfate has become one of the non-cyanide gold leaching reagents to repla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/04C22B3/12
CPCC22B3/04C22B3/12C22B11/04Y02P10/20
Inventor 谢锋王剑符岩王伟路殿坤畅永锋
Owner NORTHEASTERN UNIV LIAONING
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