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Method for pretreating arsenic-containing gold ore by collaborative enhancement of bacterial oxidation

A pretreatment and gold ore technology, which is applied in the field of synergistically enhanced bacterial oxidation pretreatment of arsenic-containing gold ore, can solve the problems of long oxidation cycle and low oxidation rate, achieve shortening of biological oxidation cycle, increase oxidation potential, and solve low oxidation rate Effect

Active Publication Date: 2018-12-14
CENT SOUTH UNIV
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for synergistically strengthening bacterial oxidation pretreatment of arsenic-containing gold ore to solve the problem that passivation is easily formed on the surface of the mineral when the existing biological oxidation method pretreats arsenic-containing gold ore, resulting in low oxidation rate and low oxidation rate. long-term technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 100mL of diluted 9K medium, 2g of arsenic-containing gold ore, 15mL of domesticated bacteria into a 250mL Erlenmeyer flask, the dosage of sodium oxalate is 0.01mol / L, and the dosage of copper ion is 0.1g / L. The pH of the solution is 1.8, and the leaching rate of arsenic is 85.67% after oxidation in a constant temperature shaker at 30°C and 160 rpm for 6 days, and 92.33% after 8 days of oxidation.

Embodiment 2

[0042] Add 100mL of diluted 9K medium, 2g of arsenic-containing gold ore, 15mL of domesticated bacteria into a 250mL Erlenmeyer flask. The pH of the solution is 1.8, and the leaching rate of arsenic is 86.12% after being oxidized in a constant temperature shaker at 30° C. with a rotation speed of 160 rpm for 8 days.

Embodiment 3

[0044] Add 100mL of diluted 9K medium, 2g of arsenic-containing gold ore, 15mL of domesticated bacteria into a 250mL Erlenmeyer flask, the dosage of sodium oxalate is 0.005mol / L, the dosage of copper ion is 0.0, and the pH of the solution is adjusted to 1.8 with dilute sulfuric acid , after 8 days of oxidation in a constant temperature shaker at 30°C with a rotation speed of 160rpm, the leaching rate of arsenic was 83.43%.

[0045] As can be seen from the above results, adding sodium oxalate and copper ions (embodiment 1) to the bioleaching system significantly shortened the leaching period of biooxidative arsenic-containing gold ore from 10 days in the comparative example to 6 days, and the leaching rate of arsenic was also reduced by The 82.22% of the control example was significantly increased to 85.67%, and after 8 days of oxidation, the leaching rate of arsenic reached 92.33%, indicating that the method of the present invention can significantly reduce the generation of pa...

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Abstract

The invention discloses a method for pretreating an arsenic-containing gold ore by collaborative enhancement of bacterial oxidation. The method comprises the following steps of: adding fine-ground arsenic-containing gold ore into a culture medium; subsequently filling thiobacillus ferrooxidans and adding Cu2+ ions and sodium oxalate; regulating the pH of ore pulp until the ore pulp is acidic; andcarrying out biological oxidation pretreatment on the arsenic-containing gold ore. According to the method disclosed by the invention, the Cu2+ ions and the sodium oxalate are added into the ore pulpof the arsenic-containing gold ore; by collaborative action of the Cu2+ ions and the sodium oxalate, generation of inactive materials in a biological oxidation process is fundamentally and greatly reduced; the biological oxidation period is shortened by more than two days; the leaching rate of arsenic is increased by more than 10%; and the method is low in cost, high in efficiency and simple and easy to operate, and solves the technical problems that an existing method for pretreating the arsenic-containing gold ore by utilizing a biological oxidation method is low in oxidation speed and longin oxidation period.

Description

technical field [0001] The invention relates to the technical fields of biological hydrometallurgy and mineral processing, in particular to a method for synergistically strengthening bacterial oxidation pretreatment of arsenic-containing gold ore. Background technique [0002] Gold in arsenic-bearing gold ores is usually embedded in the lattice of arsenopyrite in extremely fine particles or submicroscopic form, or even disseminated. Therefore, pretreatment is required before leaching gold to expose the arsenopyrite Package gold. The current pretreatment methods for arsenic-containing gold ore include chemical oxidation, oxidative roasting, and biological oxidation. Biological oxidation has great development and application prospects because of its advantages of small investment, less pollution, and simple operation. The main gold-bearing mineral in arsenic-bearing gold ore is FeAsS. During the bacterial leaching process, arsenopyrite is easy to form passivation on the surfa...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00C22B30/04
CPCC22B3/18C22B11/04C22B30/04Y02P10/20
Inventor 李骞徐斌罗君姜涛杨永斌张雁钟强李光辉郭宇峰范晓慧陈许玲张元波彭志伟甘敏
Owner CENT SOUTH UNIV
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