Treatment method of primary gold ore

A processing method and technology for gold ore, applied in the field of primary gold ore processing, can solve the problems of long process, high cost, non-recycling, etc., and achieve the effects of simple process, low raw material cost and production cost, and significant economic benefits.

Active Publication Date: 2015-08-12
阿拉善左旗珠拉黄金开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Refractory low-grade sulfide gold ore cannot be economically recovered by conventional methods because of its low gold value. Usually, it is first enriched by mechanical beneficiat...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 40L / m to the ore heap after rinsing with dilute acid solution 2 The dripping rate of h is used to inoculate the bacterial solution, and the outflowing bacterial solution needs to be supplemented with a certain amount of culture medium and bacteria to return to the pre-oxidation system, and the concentration of the bacterial solution should not be lower than 10 6 per ml, the concentration of iron is 5-10 g / L. After the oxidized ore heap is rinsed with clean water, use 18L / m 2 Drop into NaCN solution at a dripping rate of h for gold leaching, add lye and NaCN to the outflowing expensive solution, and control the pH and NaCN concentration to be 10-11 and 0.10%-0.15% respectively. The gold content of the raw ore is 1.13g / t, and the gold leaching rate reaches 49.2% after 60 days.

Embodiment 2

[0031] Add 50L / m to the ore heap after rinsing with dilute acid solution 2 The dripping rate of h is used to inoculate the bacterial solution, and the outflowing bacterial solution needs to be supplemented with a certain amount of culture medium and bacteria to return to the pre-oxidation system, and the concentration of the bacterial solution should not be lower than 10 6 per ml, the concentration of iron is 2-10 g / L. After the oxidized ore heap is rinsed with clean water, use 20L / m 2 Drop into NaCN solution at a dripping rate of h for gold leaching, add lye and NaCN to the outflowing expensive solution, and control the pH and NaCN concentration to be 10-11 and 0.10%-0.12% respectively. The gold content of the ore is 1.13g / t, and the gold leaching rate reaches 48.1% after 60 days.

Embodiment 3

[0033] Add 30L / m to the ore heap after rinsing with dilute acid solution 2 The dripping rate of h is used to inoculate the bacterial solution, and the outflowing bacterial solution needs to be supplemented with a certain amount of culture medium and bacteria to return to the pre-oxidation system, and the concentration of the bacterial solution should not be lower than 10 6 per ml, the concentration of iron is 5~12g / L. After the oxidized ore heap is rinsed with clean water, use 20L / m 2 Drop into NaCN solution at a dripping rate of h for gold leaching, add lye and NaCN to the outflowing expensive solution, and control the pH and NaCN concentration to be 10-11 and 0.10%-0.15% respectively. The gold content of the ore is 1.13g / t, and the gold leaching rate reaches 51.1% after 60 days.

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Abstract

The invention discloses a treatment method of primary gold ore. The method includes: biologically pre-oxidizing sulfide minerals of the primary gold core, drip-leaching leaching columns with dilute sulphuric acid solution at the speed of 10 L/(m<2>.h) to 50 L/(m<2>.h), and after pH of outgoing liquid is equal to that of dilute acid, adding cultured germs to allow biological pre-oxidization; after biological pre-oxidization, washing the columns with clear water, and performing a cyanidation leaching experiment. The pH value of cyanidation leachate is controlled to 10 through 11, and leaching speed is controlled to 15 L/(m<2>.h) through 25 L/(m<2>.h). Leaching efficiency of the primary gold core subjected to biological oxidation treatment is high, and the treatment is environment friendly; a new way, effective, feasible and environment friendly, is provided for the heap leaching production of gold-bearing sulfide ores.

Description

technical field [0001] The invention relates to a treatment method for primary gold ore, in particular to a method for treating primary gold ore with microorganisms. Background technique [0002] Among the gold resources with proven reserves in my country, medium-grade ore deposits and medium- and small-scale deposits account for the vast majority, while high-grade ore deposits and large-scale gold deposits are rare, especially the lack of super-large gold deposit resources. With the continuous development of gold ore resources, the amount of medium and high-grade gold ore resources is getting less and less, and the development and utilization of low-grade or even ultra-low-grade gold deposits is becoming more and more important, which has led to the rapid development of heap leaching technology. [0003] Compared with the early industrial application of copper ore heap leaching, the development history of gold ore heap leaching is relatively short, but the development speed...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/06C22B11/08
CPCY02P10/20
Inventor 张邦胜周立杰苏立峰王海北谢铿
Owner 阿拉善左旗珠拉黄金开发有限责任公司
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