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Method for reinforcing bacterial preoxidation of arsenic-containing gold ore

A pre-oxidation and gold mining technology, applied in the direction of improving process efficiency, can solve the problems of strengthening the anode reaction and not strengthening the cathode simultaneously, so as to achieve the effect of accelerating the rate, increasing the oxidation rate, and accelerating the dissolution

Active Publication Date: 2013-02-27
CENT SOUTH UNIV
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Problems solved by technology

So far, there are few reports about metal ions enhancing bacterial oxidation of arsenic-containing gold ore, and there is no report on strengthening the anode reaction while strengthening the cathode. Based on the above research status, the present invention develops a technical Innovation on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The ore sample is B ore containing 19.32% arsenic, the dosage of additives is 0.01g / L of Ag(I) and 1g / L of Fe(Ⅲ), the concentration of ore pulp is 10%, and the inoculation amount of bacteria solution is 10%; The quantity is 10 8 / ml, the oxidation rate was 83.94% after 12 days of oxidation.

Embodiment 2

[0025] Example 2: The ore sample is B ore containing 19.32% arsenic, the dosage of additives is Ag(I) 0.01g / L and Fe(Ⅲ) 8g / L, the concentration of ore pulp is 10%, and the inoculation amount of bacteria solution is 10%; The quantity is 10 8 / ml, the oxidation rate was 88.01% after 12 days of oxidation.

Embodiment 3

[0026] Example 3: The ore sample is B ore containing 19.32% arsenic, the dosage of additives is Ag(I) 0.01g / L and Fe(Ⅲ) 10g / L, the concentration of ore pulp is 10%, and the inoculation amount of bacteria solution is 10%; The quantity is 10 8 / ml, the oxidation rate was 91.00% after 12 days of oxidation.

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Abstract

The invention provides a method for reinforcing bacterial preoxidation of an arsenic-containing gold ore. Two additives (separately silver nitrate and ferric sulfate or ferric nitrate) are added. When being in use, a chloride-free 9K solution is prepared with the concentration of Ag(I) and Fe(III) reaching 0.005-0.05 g / L and 1-10 g / L respectively; then the arsenic-containing gold ore is added to the solution; and finally, a certain amount of a bacterium liquid is inoculated to the system for bacterial preoxidation. Under the synergistic effects of Ag(I) and Fe(III), the bacterial oxidation rate of the arsenic-containing gold ore can reach higher than 90%; and oxidation time is greatly shortened. On one hand, the synergistic reinforcement of Ag(I) and Fe(III) accelerates the dissolution of the arsenopyrite; on the other hand, toxicity of As (III) in the system toward to the bacteria is lowered, so that the bacterial oxidation of the arsenic-containing gold ore is reinforced; and important theoretical and technical guidance for increasing efficiency bacterial preoxidation-cyanide gold leaching process of the gold ore.

Description

technical field [0001] The invention belongs to the field of biometallurgy and relates to a method for intensifying bacterial pre-oxidation of arsenic-containing gold ores, realizing efficient bacterial pre-oxidation of arsenic-containing, especially high-arsenic, gold ores, thereby creating favorable conditions for gold extraction of arsenic-containing gold ores. Background technique [0002] With the depletion of easy-to-select gold ore resources, refractory gold ore will become an unavoidable important resource in the gold industry in the future. Among the refractory gold ore resources, sulfur-containing arsenic gold ores account for more than 1 / 3, which are extremely difficult to leach ores, and pretreatment methods must be used. At present, the main pretreatment methods used for this kind of ore are: wet chemical pretreatment, roasting oxidation pretreatment and bacterial oxidation pretreatment. Compared with other processes, the bacterial pre-oxidation treatment proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B11/00
CPCY02P10/20
Inventor 李骞杨永斌姜涛范晓慧李光辉郭宇峰陈许玲张元波苑洪晶张雁杨勰
Owner CENT SOUTH UNIV
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