A method of regulating potential to enhance biooxidation of arsenic-containing gold ore

A technology of biological oxidation and gold mining, applied in the direction of improving process efficiency, etc., can solve the problems that the total iron content is unfavorable to the growth and reproduction of bacteria, unfavorable to the oxidation and dissolution of arsenic and gold ore, and hinders the growth and reproduction of bacteria, so as to facilitate the oxidation rate and shorten the leaching Cycle, cheap effect

Active Publication Date: 2019-08-09
CENT SOUTH UNIV
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Problems solved by technology

In the bioleaching process of arsenic-gold ore, there is no need to add Fe 3+ When, microorganisms can part of the Fe 2+ Oxidized to Fe 3+ , but the Fe produced by oxidation 3+ It is easy to precipitate to form jarosite, which makes the solution potential level in the initial stage of bioleaching (0-8 days) low, which is not conducive to the oxidation and dissolution of arsenic-gold ore
Related studies have shown that adding a large amount of Fe in the initial stage of the reaction 3+ It can improve the oxidation ability of the system to arsenic-gold ore to a certain extent, but only adding Fe 3+ without adding Fe 2+ It will seriously hinder the growth and reproduction of bacteria, which is not good for the whole bioleaching process
If Fe 3+ and Fe 2+ Added in a certain proportion, a large amount of Fe 2+ The existence of the solution makes the solution potential still low, and the higher total iron content is not conducive to the growth and reproduction of bacteria, so it is also not conducive to the bioleaching process

Method used

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  • A method of regulating potential to enhance biooxidation of arsenic-containing gold ore

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Experimental program
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Embodiment 1

[0030] Such as figure 1 As shown, a method for regulating potential to strengthen the biooxidation of arsenic-containing gold ore, comprising the following steps:

[0031] (1) Using wet or dry grinding to finely grind the arsenic-containing gold ore into ore powder, and make the content of the part of the ore powder whose particle size is less than 0.074mm account for more than 80% of the total ore powder mass;

[0032] (2) Using the preparation of Fe-containing 2+ 9K medium, and then use Fe-free 2+ Fe 3+ Solution; Wherein, the main component of 9K culture medium is: (NH 4 ) 2 SO 4 The content is 3.0g / L, MgSO 4 ·7H 2 O content is 0.5g / L, K 2 HPO 4 ·3H 2 O content is 0.5g / L, KCl content is 0.1g / L, Ca(NO 3 ) 2 4H 2 O content is 0.01g / L, FeSO 4 ·7H 2 O content is 29.8g / L; Fe 3+ The main components of the solution are: (NH 4 ) 2 SO 4 The content is 3.0g / L, MgSO 4 ·7H 2 O content is 0.5g / L, K 2 HPO 4 ·3H 2 O content is 0.5g / L, KCl content is 0.1g / L, Ca(NO 3...

Embodiment 2

[0048] A method for regulating potential to strengthen biooxidation of arsenic-containing gold ore, comprising the following steps:

[0049] (1) Using wet or dry grinding to finely grind the arsenic-containing gold ore into ore powder, and make the content of the part of the ore powder whose particle size is less than 0.074mm account for more than 80% of the total ore powder mass;

[0050] (2) Using the preparation of Fe-containing 2+ 9K medium, and then use Fe-free 2+ Fe 3+ Solution; Wherein, the main component of 9K culture medium is: (NH 4 ) 2 SO 4 The content is 3.0g / L, MgSO 4 ·7H 2 O content is 0.5g / L, K 2 HPO 4 ·3H 2 O content is 0.5g / L, KCl content is 0.1g / L, Ca(NO 3 ) 2 4H 2 O content is 0.01g / L, FeSO 4 ·7H 2 O content is 29.8g / L; Fe 3+ The main components of the solution are: (NH 4 ) 2 SO 4 The content is 3.0g / L, MgSO 4 ·7H 2 O content is 0.5g / L, K 2 HPO 4 ·3H 2 O content is 0.5g / L, KCl content is 0.1g / L, Ca(NO 3 ) 2 4H 2 O content is 0.01g / L...

Embodiment 3

[0066] A method for regulating potential to strengthen biooxidation of arsenic-containing gold ore, comprising the following steps:

[0067] (1) Using wet or dry grinding to finely grind the arsenic-containing gold ore into ore powder, and make the content of the part of the ore powder whose particle size is less than 0.074mm account for more than 80% of the total ore powder mass;

[0068] (2) Using the preparation of Fe-containing 2+ 9K medium, and then use Fe-free 2+ Fe 3+ Solution; Wherein, the main component of 9K culture medium is: (NH 4 ) 2 SO 4 The content is 3.0g / L, MgSO 4 ·7H 2 O content is 0.5g / L, K 2 HPO 4 ·3H 2 O content is 0.5g / L, KCl content is 0.1g / L, Ca(NO 3 ) 2 4H 2 O content is 0.01g / L, FeSO 4 ·7H 2 O content is 29.8g / L; Fe 3+ The main components of the solution are: (NH 4 ) 2 SO 4 The content is 3.0g / L, MgSO 4 ·7H 2 O content is 0.5g / L, K 2 HPO 4 ·3H 2 O content is 0.5g / L, KCl content is 0.1g / L, Ca(NO 3 ) 2 4H 2 O content is 0.01g / L...

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Abstract

A method for enhancing biological oxidation of arsenic-containing gold ore through potential regulation and control is disclosed. The method includes (1) subjecting the arsenic-containing gold ore tofine grinding to obtain ore powder; (2) preparing a 9K medium; (3) adding the ore powder obtained in the step (1) and thiobacillus ferrooxidans into the 9K medium prepared in the step (2), performingprimary biological leaching to obtain primary ore pulp, then adding a Fe<3+> solution to adjust the potential of the primary ore pulp, adjusting the pH of the primary ore pulp at the same time, and performing secondary biological leaching to obtain secondary ore pulp; and (4) after the secondary biological leaching in the step (3) is finished, subjecting the secondary ore pulp to solid liquid separation to obtain gold leaching slag. The method can significantly shorten the leaching period, is high in treatment efficiency and simple to operate, and can be widely used in ore enterprises of various sizes.

Description

technical field [0001] The invention belongs to the technical field of biological hydrometallurgy and mineral processing, in particular to a method for leaching arsenic-containing gold ore by biological oxidation. Background technique [0002] Gold in arsenic-bearing gold ores usually exists in extremely fine particles or submicroscopic forms, and some are even embedded in the crystal lattice of arsenic-gold ores in a disseminated state. Therefore, pretreatment is required before leaching gold to expose the arsenic-gold ores. package of gold. At present, among the pretreatment methods of arsenic-containing gold ore, the biological oxidation method has significant advantages in terms of environment and economy, and has broad development and application prospects. However, it also has certain shortcomings, such as long biological oxidation cycle and other issues. For the biological oxidation of arsenic-gold ore, arsenic-gold ore is very easy to generate passivation products ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B11/00
CPCC22B3/18C22B11/04Y02P10/20
Inventor 李骞张雁徐斌姜涛杨永斌范晓慧李光辉郭宇峰陈许玲张元波彭志伟甘敏易凌云杨凌志饶明军刘光沈煌齐伟
Owner CENT SOUTH UNIV
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