Sulfur and arsenic containing difficult-to-treat gold mine gold extraction method

A technology for refractory gold ore and bacteria, which is applied in the field of hydrometallurgy, can solve the problems of long leaching cycle, low leaching rate, and low recovery rate of gold leaching, and achieve the effects of reducing a large amount of production, promoting proliferation, and expanding utilization value

Inactive Publication Date: 2016-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for extracting gold from refractory gold ores containing sulfur and arsenic, which solves the problems of long leaching period and low leaching rate of bacteria leaching...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Add 100mL of 9K medium solution into a 250mL conical flask, then add a certain amount of refractory gold ore containing sulfur and arsenic for sterilization, add 6g / L solid activated carbon after sterilization, and finally inoculate 15ml of acidophilic Thiobacillus ferrooxidans (A.f bacteria) in the system (the concentration of bacteria in the system is 1.6×10 8 / ml), after the bacterial pre-oxidation is completed, adjust the slurry concentration and pH value, and then add a gold leaching agent for gold leaching. The leaching rate of arsenic is 66.1%, and the As in the leaching solution 3+ Concentration of 3.2g / L, As 5+ The concentration of 2g / L, the concentration of bacteria is 10 9 / ml, the recovery rate of gold was 73.1%.

Embodiment 2

[0026] Example 2: Add 100 mL of 9K culture medium solution into a 250 mL Erlenmeyer flask, then add a certain amount of refractory gold ore containing sulfur and arsenic for sterilization, add 8 g / L of solid activated carbon after sterilization, and finally inoculate 15 mL of acidophilic Thiobacillus ferrooxidans (A.f bacteria) in the system (the concentration of bacteria in the system is 1.6×10 8 / ml), after the bacterial pre-oxidation is completed, adjust the slurry concentration and pH value, and then add a gold leaching agent for gold leaching. The leaching rate of arsenic is 81.2%, and the As in the leaching solution 3+ Concentration 3g / L, As 5+ The concentration of 2.1g / L, the concentration of bacteria is 10 12 / ml, the recovery rate of gold is 95.8%.

Embodiment 3

[0027] Example 3: Add 100 mL of 9K culture medium solution into a 250 mL Erlenmeyer flask, then add a certain amount of refractory gold ore containing sulfur and arsenic for sterilization, add 10 g / L of solid activated carbon after sterilization, and finally inoculate 15 mL of acidophilic Thiobacillus ferrooxidans (A.f bacteria) in the system (the concentration of bacteria in the system is 1.6×10 8 / ml), after the bacterial pre-oxidation is completed, adjust the slurry concentration and pH value, and then add a gold leaching agent for gold leaching. The leaching rate of arsenic is 77.9%, and the As in the leaching solution 3+ Concentration of 2.8g / L, As 5+ The concentration of 2g / L, the concentration of bacteria is 10 11 / ml, the recovery rate of gold is 90.15%.

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Abstract

The invention provides a sulfur and arsenic containing difficult-to-treat gold mine gold extraction method. According to the method, firstly, solid active carbon is added for enhancing bacterial oxidation pretreatment; then, after the ore pulp concentration and the pH are regulated, active carbon adsorption is performed for leaching gold. At the biological oxidation stage, the dosage of the solid active carbon is 6g/L to 10g/L; the granularity range is 1mm to 5mm; under the effect of the solid active carbon, the oxidation time of sulfur and arsenic containing difficult-to-treat gold mine biological leaching is greatly shortened; the leaching rate is greatly improved; after the pre-oxidation is completed, the ore pulp concentration and the pH are regulated, and the gold leaching is directly performed; gold and arsenic are recovered through analysis after the gold leaching. The method provides important theoretical and technical guidance for sulfur and arsenic containing difficult-to-treat gold mine biological pre-oxidation and gold leaching.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and relates to a method for extracting gold from refractory gold ores containing sulfur and arsenic, which realizes the efficient pre-oxidation and leaching of gold by bacteria on refractory gold ores containing sulfur and arsenic, thereby producing refractory gold ores containing sulfur and arsenic Withdrawing gold creates favorable conditions. Background technique [0002] Gold not only serves as an irreplaceable currency store and avoids financial risks, but also has broad application prospects in industrial and high-tech fields. In my country, with the depletion of easy-to-select gold ore resources, refractory gold ore has become the main raw material for gold production. Refractory gold ore accounts for more than 60% of the world's gold reserves, but the utilization rate is low. Efficient utilization of refractory gold deposits has become an important and urgent research topic in the field of...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00
CPCC22B3/18C22B11/04Y02P10/20
Inventor 李骞姜涛杨永斌徐斌刘光张雁纪方舟齐伟沈煌李光辉范晓慧郭宇峰陈许玲张元波彭志伟甘敏杨凌志谢小焱
Owner CENT SOUTH UNIV
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