Bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores

A bacterial oxidation and pretreatment technology, which is applied in the direction of improving process efficiency, can solve the problems of poor gold extraction effect, and achieve significant economic benefits, less investment, and obvious economic benefits
CN101792853AActive Publication Date: 2010-08-04NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2010-08-04

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Abstract

The invention relates to a bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores, comprising the following steps of: inoculating a mixed bacterial solution containing CCTCC NO: M209074 and CCTCC NO: M207215 to a 9K culture medium for culturing; adding ore powder to a bacterial culture solution; carrying out bacterial oxidation pretreatment at the temperature of 44-60 DEG C, wherein pH is 0.8-2.5; charging air and stirring for 4-8 days, wherein the aeration rate is 0.1-0.3m3 / h and the stirring rate is 600-1400 turns / min; adding water to bacterial oxidation slag and blending into a slag slurry; regulating the pH value of the slag slurry to 9.0-12; then adding sodium cyanide, wherein the pH value in the cyanidation process is 9.0-12, and the cyanidation time is 24-48 hours. The leaching rate of gold is greatly increased and can reach by more than 94 percent after cyanidation leaching is carried out on the bacterial oxidation treated bacterial oxidation slag, and the economic benefit is extremely remarkable.
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Description

technical field

[0001] The invention belongs to the technical field of biometallurgy, and in particular relates to a method for bacterial oxidation pretreatment of arsenopyrite-realgar type refractory gold ore-cyanidation gold extraction. Background technique

[0002] Gold mine is an important non-renewable mineral resource. With the deepening of mining, the reserves of easy-to-leach gold mines are reduced, and the refractory gold mines have attracted widespread attention. Refractory gold ore means that the ore is leached directly after grinding, and the leaching rate of gold is low or very low. Generally, the leaching rate is 80% as the limit, and those lower than this are collectively referred to as refractory gold ore. Some ores are extremely difficult to leach, and the direct leaching rate of such ores is only 10% to 30%. Arsenic-containing gold ore is an important type of refractory gold ore. In order to improve the utilization rate, this kind of ore must be pretreate...

Claims

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