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High-arsenic high-carbon micro-fine particle refractory gold ore biological gold extraction technology and microorganism used in technology

A technology for refractory gold ore and fine particles, applied in the direction of improving process efficiency, can solve the problems of low gold extraction efficiency of high arsenic and high carbon fine-grained gold ore, and achieve the improvement of comprehensive recycling level, significant economic benefits, and elimination of The effect of gold robbery

Active Publication Date: 2013-07-03
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned technologies, provide a gold extraction process for multiple extremely refractory gold ores, and mainly solve the difficult problem of low gold extraction efficiency of high-arsenic, high-carbon, fine-grained gold ores

Method used

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  • High-arsenic high-carbon micro-fine particle refractory gold ore biological gold extraction technology and microorganism used in technology
  • High-arsenic high-carbon micro-fine particle refractory gold ore biological gold extraction technology and microorganism used in technology
  • High-arsenic high-carbon micro-fine particle refractory gold ore biological gold extraction technology and microorganism used in technology

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Domestically, the gold mine in Pu'an County, Xingyi City, Guizhou Province is a difficult gold mine with high arsenic and high carbon fine particles. The content of arsenic and organic carbon in the gold concentrate is high, and the gold particles are fine and embedded in the sulfur concentrate. Conventional cyanide leaching is used , the leaching rate of gold is only 19.87%. The main element analysis of gold concentrate is shown in Table 1:

[0030] Table 1 Elemental Analysis of Gold Concentrate

[0031] element Au(g / t) Ag(g / t) S(％) As(%) Cu(%) content 23.78 4.4 35.85 6.47 0.033 element Pb(%) Zn(%) Fe(%) Organic C (%) content 0.008 0.053 29.73 2.42

[0032] (1) Strain cultivation: inoculate the strains in 9K medium for expanded cultivation, the inoculum volume is 10% by volume, the pH of the medium is 1.0-2.0, the culture temperature is 45-55°C, and the culture time is 24-36 hours .

[00...

Embodiment 2

[0042] The arsenic and organic carbon content of the gold mine in Zhenfeng County, Guizhou Province is relatively high, and the gold leaching rate by conventional cyanide leaching is 18.56%. Therefore, the biological pre-oxidation-cyanide leaching process is adopted. The process flow is the same as that of Example 1. The multi-element analysis of gold concentrate And treatment effect see table 3, table 4.

[0043] Table 3 Elemental Analysis of Gold Concentrate

[0044] element Au(g / t) Ag(g / t) S(％) As(%) Cu(%) content 25.28 2.42 28.64 7.28 0.023 element Pb(%) Zn(%) Fe(%) Organic C (%) content 0.006 0.075 28.68 2.51

[0045] Table 4 Biological preoxidation-gold extraction results

[0046]

[0047] It can be seen from the table that by adopting the process of the present invention, the gold cyanidation efficiency is greatly improved, and good economic and social benefits have been achieved.

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Abstract

The invention provides a microorganism used in high-arsenic high-carbon micro-fine particle refractory gold ore biological gold extraction technology, and the technology utilizing the microorganism to extract gold from high-arsenic high-carbon micro-fine particle refractory gold ore. The method comprises the following steps: after grinding and size mixing ore, adding the microorganism, and performing air agitation for pre-oxidation, wherein the period of pre-oxidation is 5 to 7 days; performing solid-liquid separation on the pre-oxidized ore pulp, adding lime into a supernatant liquor for neutralization, then decreasing arsenic in the neutralized supernatant liquor, and reusing the liquor for ore mixing; adding water into a bottom liquor to regulate the concentration of the ore pulp, and adding lime into the liquor to keep the pH within 11 and 12; and finally, extracting gold by adding sodium cyanide into the liquor with the pH ranging from 11 to 12, so as to obtain a gold-containing valuable liquor. The technology provided by the invention can fully utilizes the low-grade multiple refractory gold ore, improves the comprehensive utilization level of an ore mine, saves the cost, improves the profit, and facilitates development of low carbon economy of the metallurgical industry. The technology and the microorganism are particularly suitable for being applied to development of high-arsenic high-carbon Carlin-type gold deposits in golden triangle areas in Yunnan Province, Guizhou Province and Guangxi Province of China.

Description

technical field [0001] The invention relates to a biological gold extraction process for refractory gold ores, in particular to the biological gold extraction of fine-grained refractory gold ores with high arsenic (the content of arsenic is generally above 1 wt%) and high carbon (the content of organic carbon is generally above 0.5 wt%) process, and a microorganism used in the process. Background technique [0002] There are many types of gold mines in my country, and the reserves of gold mines are 4,265 tons. However, there are few large-scale and extra-large gold deposits, many small and medium-sized gold deposits, and low-grade refractory ores account for a large proportion of the country's proven reserves. Carlin-type gold deposit is the main type and is one of the most difficult typical gold deposits. This type of gold deposit has low grade, large scale, indistinct boundary between ore body and surrounding rock, and gold is mainly distributed in micro-submicroscopic for...

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 武彪温建康陈勃伟尚鹤
Owner 有研资源环境技术研究院(北京)有限公司
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