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Method for increasing gold recovery rate in biological oxidation process of arsenic-containing gold concentrate

A technology of biological oxidation and gold concentrate, applied in the direction of improving process efficiency, can solve problems such as gold loss, and achieve the effect of reducing gold loss, facilitating implementation of management, great economic benefits and social benefits

Inactive Publication Date: 2017-03-22
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for improving the recovery rate of gold in the biooxidation process of arsenic-containing gold concentrate, so as to solve the problem of gold loss when some gold ores adopt the biooxidation process without changing the conditions of the existing biooxidation process To improve the gold recovery rate and reduce economic losses

Method used

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  • Method for increasing gold recovery rate in biological oxidation process of arsenic-containing gold concentrate
  • Method for increasing gold recovery rate in biological oxidation process of arsenic-containing gold concentrate
  • Method for increasing gold recovery rate in biological oxidation process of arsenic-containing gold concentrate

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Experimental program
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Effect test

Embodiment 1

[0044] (1) Grinding and classification

[0045] Grind arsenic-containing gold concentrate to -0.045mm, accounting for 90%, and carbonate minerals to -0.045mm, accounting for 90%, and filter and dry the ground minerals separately for later use;

[0046] (2) Biological oxidation

[0047] Slurry the arsenic-containing gold concentrate ground in step (1) to a pulp concentration of 10%, adjust the pH value to 1.3, feed it into the biological oxidation system, and at the same time feed 5% carbonate minerals into the gold concentrate at a temperature of 38 ℃, dissolved oxygen 3mg / l, medium dosage: (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 The concentration of O is 3.0g / L, 0.5g / L, 0.5g / L respectively, and the oxidation time is 4 days;

[0048] (3) Gold extraction by cyanide

[0049] The oxidized ore pulp in step (2) is thickened, washed, and pulped to a mass percentage concentration of 25% in sequence, lime is added, the pH value is adjusted to 10, the amount of sodium cyanide ...

Embodiment 2

[0054] (1) Grinding and classification

[0055] Grind arsenic-containing gold concentrate to -0.045mm, accounting for 92.5%, and carbonate minerals to -0.045mm, accounting for 92.5%, and filter and dry the ground minerals separately for later use;

[0056] (2) Biological oxidation

[0057] Slurry the fine arsenic-containing gold concentrate in step (1) to a pulp concentration of 15%, adjust the pH value to 1.6, and feed it into the biological oxidation system. At the same time, add 12.5% ​​of the carbonate minerals to the gold concentrate at a temperature of 40 ℃, dissolved oxygen 4mg / l, medium dosage: (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 The concentration of O is 3.0g / L, 0.5g / L, 0.5g / L respectively, and the oxidation time is 5 days;

[0058] (3) Gold extraction by cyanide

[0059] The oxidized ore pulp in step (2) is thickened, washed, and pulped to a mass percentage concentration of 32.5% in sequence, lime is added, the pH value is adjusted to 10.5, the amount ...

Embodiment 3

[0064] (1) Grinding and classification

[0065] Grind arsenic-containing gold concentrate to -0.045mm, accounting for 95%, and carbonate minerals to -0.045mm, accounting for 95%, and filter and dry the ground minerals separately for later use;

[0066] (2) Biological oxidation

[0067] Slurry the fine arsenic-containing gold concentrate in step (1) to a pulp concentration of 20%, adjust the pH value to 2.0, feed it into the biological oxidation system, and feed 20% of the carbonate minerals into the gold concentrate at the same time, at a temperature of 42 ℃, dissolved oxygen 5mg / l, medium dosage: (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 The concentration of O is 3.0g / L, 0.5g / L, 0.5g / L respectively, and the oxidation time is 7 days;

[0068] (3) Gold extraction by cyanide

[0069] The oxidized pulp in step (2) is thickened, washed, and pulped to a mass percentage concentration of 40% in sequence, lime is added, the pH value is adjusted to 11, the amount of sodium cya...

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Abstract

The invention provides a method for increasing the gold recovery rate in the biological oxidation process of arsenic-containing gold concentrate and belongs to the technical field of wet metallurgy. The method includes the following steps that (1), the gold concentrate and carbonate minerals are ground, and then are filtered and dried for use; (2), the gold concentrate obtained in the step (1) is subjected to size mixing, the gold concentration enters a biological oxidation system, and the carbonate minerals are added while the gold concentrate is added; and (3), oxidation slag obtained in the step (2) is subjected to size mixing, and cyanidation leaching is carried out. On one hand, the problem that the pH value in the biological oxidation process of the arsenic-containing gold concentrate is gradually reduced, so that the activity of a strain is affected can be solved; and on the other hand, the recovery rate of gold can be increased, greater economic benefits and social benefits are obtained, an existing biological oxidation process flow is not changed, and management is convenient to carry out.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for recovering gold in a biological oxidation process of arsenic-containing gold concentrate. Background technique [0002] With the large-scale mining of gold mines, the resources of easy-to-treat gold mines are decreasing day by day, and the development of complex and difficult-to-treat gold mines, especially complex and difficult-to-treat gold mines containing arsenic, has become increasingly important and will become an unavoidable part of the gold industry in the future. important resource. my country is rich in arsenic-containing refractory gold deposits. Since the mid-1970s, such gold deposits have been discovered in Yunnan, Guizhou, Guangxi, Sichuan, Shaanxi, Gansu, Liaoning, Qinghai, Xinjiang and other regions. According to statistics, the proven gold reserves are about 700t, and the prospective reserves are over 1000t. Research and develop...

Claims

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Application Information

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IPC IPC(8): C22B11/08C22B3/18
CPCC22B3/18C22B11/08Y02P10/20
Inventor 王秀美张世镖李健赵俊蔚郑晔郝福来赵国惠
Owner CHANGCHUN GOLD RES INST