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Two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria

A pre-oxidation gold extraction, Carlin-type technology, applied in the direction of improving process efficiency, can solve the problems of low gold recovery rate and environmental pollution, and achieve the effect of improving leaching rate and large economic benefits

Active Publication Date: 2014-07-09
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology

This process solves the conventional problems of low gold recovery rate and environmental pollution

Method used

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  • Two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria
  • Two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria
  • Two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria

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Embodiment 1

[0038] The present invention is applied to a Carlin-type gold mine in Guizhou. The target mineral is natural gold. Under the microscope, a very small amount of microfine gold particles can be seen embedded in gangue, mostly symbiotic with pyrite, and the particle size is extremely small. Metal sulfide minerals are mainly pyrite, containing a small amount of arsenopyrite and very small amounts of sphalerite, chalcopyrite, and galena. The metal oxides are mainly limonite, followed by magnetite and hematite. The gangue minerals are mainly quartz and clay minerals, containing a small amount of fluorite, dolomite, mica, etc., with high carbon content. The ore contains Au3.05g / t, S5.95%, As0.25%, C total 1.44, where C organic 0.52.

[0039] The process of extracting gold from the above-mentioned ores includes the following steps:

[0040] 1. Crushing, fine grinding and flotation of ore

[0041] Crush and finely grind the raw ore to -0.074mm to account for 95%. After activation ...

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Abstract

The invention relates to a two-stage biological pre-oxidation gold extraction process for Carlin-type gold deposit by two exclusive ore-leaching bacteria. The process comprises the steps of: (1) subjecting the Carlin-type gold deposit to crushing, fine grinding and flotation to obtain flotation gold concentrate, and conducting drug removal treatment on the flotation gold concentrate; (2) employing an exclusive bacterium I to perform first-stage oxidation on the flotation gold concentrate obtained in step (1); (3) employing an exclusive bacterium II to perform second-stage oxidation on the gold concentrate oxidizing slag obtained in step (2); and (4) subjecting the oxidizing slag obtained in step (3) to cyaniding leaching. The exclusive bacterium I is Leptospirillum ferriphilum MJ-CL, and the exclusive bacterium II is Thermoanaerobacteriumsp. L-D. Being able to improve the gold recovery rate, the process provided by the invention has the advantages of small investment, low production cost, and no generation of exhaust gas, is especially suitable for the Carlin-type gold deposit, and can obtain greater economic, social and environmental benefits.

Description

technical field [0001] The invention relates to two kinds of exclusive ore-leaching bacteria used in a two-stage biological pre-oxidation gold extraction process of a Carlin type gold mine. Background technique [0002] With the continuous mining of gold ore resources, the number of easy-to-handle ore is decreasing day by day, and the refractory gold ore will become the main resource of the gold industry in the future. There are a large number of arsenic-containing and carbon-containing Carlin-type gold deposits in the Yunnan, Guizhou and Guangxi regions of my country. The gold ore resource reserves exceed 650 tons, which is a typical multiple extremely refractory gold deposit. Therefore, the comprehensive utilization of this type of gold resources is of great significance to the future development of the gold industry. [0003] Due to its low grade and difficult selection and smelting, it is difficult for this type of resource to be economically recovered by traditional mi...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00
CPCY02P10/20
Inventor 尚鹤温建康武彪陈勃伟
Owner 有研资源环境技术研究院(北京)有限公司
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