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Biologically leached gold and self-power-generation recovery method of gold in leach solution

A technology of bioleaching and recovery method, applied in the direction of improving process efficiency, can solve the problems of low gold concentration, restricting popularization and application, etc., to achieve the effect of no environmental pollution and low cost

Inactive Publication Date: 2015-09-16
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that both types of bacteria can leach gold from gold ore, but the concentration of gold in the leach solution is low, which is the key to restricting the popularization and application of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1), with the ore particle size being less than 200 mesh and accounting for 80% gold ore powder as raw material, adjust the pH of the culture medium to 2.0, add a certain amount of bacterial liquid, fill the reactor with enough gas, and keep it at 35°C Gradually add gold ore powder until the pulp concentration is 10%, carry out bacterial leaching for 7 days, and the leaching rate of gold is 92%.

[0024] (2), using the leachate as raw material, connect the reaction loop in the self-generating reactor, keep it warm at 25°C for 8 hours, and carry out self-generating and reclaiming the gold in the leaching solution under the action of stirring, the recovery rate of gold is 98.9% .

Embodiment 2

[0026] (1), with the ore particle size being less than 200 mesh and accounting for 85% gold ore powder as raw material, adjust the pH of the medium to 1.8, add a certain amount of bacterial liquid, fill the reactor with enough gas, and keep it at 38°C Gradually add gold ore powder until the pulp concentration is 20%, carry out bacterial leaching for 8 days, and the leaching rate of gold is 94%.

[0027] (2), using the leachate as raw material, connect the reaction loop in the self-generating reactor, keep warm at 50°C for 12 hours, and carry out self-generating and recovering the gold in the leaching solution under the action of stirring, the recovery rate of gold is 99.1% .

Embodiment 3

[0029] (1), with the ore particle size being less than 200 mesh and accounting for 88% gold ore powder as raw material, adjust the pH of the medium to 2.5, add a certain amount of bacterial liquid, fill the reactor with enough gas, and keep it at 40°C Gradually add gold ore powder until the pulp concentration is 33%, carry out bacterial leaching for 8 days, and the leaching rate of gold is 94.5%.

[0030] (2), using the leachate as raw material, connect the reaction loop in the self-generating reactor, keep it warm at 30°C for 40 hours, and carry out self-generating and reclaiming the gold in the leaching solution under the action of stirring, and the recovery rate of gold is 98.7% .

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PUM

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Abstract

The invention discloses a biologically leached gold and a self-power-generation recovery method of gold in a leach solution. The method comprises the following steps: regulating the pH value of a culture medium to the proper value at specific temperature, adding a certain amount of bacterium solution, gradually adding a certain amount of auriferous ore powder which is ground to a specific fineness under gas-charged conditions until the auriferous ore content reaches a certain concentration, stirring to perform bacterial leaching for some time while keeping the pH value of the ore slurry constant so that gold in the ore enters the solution, and carrying out solid-liquid separation; and keeping the separated leach solution at certain temperature, connecting to a self power generator, and carrying out a self power generation technique under stirring actions to recover gold in the leach solution. The method is simple, does not need high temperature or high pressure, does not introduce any toxic reagent, can effectively separate gold in the auriferous ore and effectively recover gold in the leach solution, and has the advantages of environment friendliness, no pollution and low cost.

Description

technical field [0001] The invention relates to a bioleaching method of gold in gold ore and a self-generating recovery method of gold in a leaching solution, in particular to a process of extracting gold by bioleaching-self-generating recovery of gold in a leaching solution. Background technique [0002] Cyanide is currently the most important method of gold extraction. However, sodium cyanide is a highly toxic chemical. The sodium cyanide remaining in the tailings dam and some toxic cyanide produced during the gold leaching process can cause serious environmental problems. Some countries and regions have banned the use of cyanide in gold extraction. compounds. [0003] Among the alternative cyanidation processes that have been studied, bioleaching technology is recognized by everyone for its low investment cost, low energy consumption and low negative impact on the environment, and has a very broad application prospect. The bioleaching technology uses the complexing agen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 张世镖赵俊蔚赵国惠李健
Owner CHANGCHUN GOLD RES INST