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A kind of processing method of primary gold ore

A treatment method and gold mine technology, applied in the field of primary gold ore treatment, can solve the problems of long process, high cost, and low gold value of sulfide gold ore, and achieve significant economic benefits, low raw material cost and production cost, and simple process Effect

Active Publication Date: 2017-06-20
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 beneficiation methods such as flotation, and then the concentrate is pretreated to expose the gold, and then used Conventional cyanide leaching and other methods of recycling, high cost and long process

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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Patent Type & Authority Patents(China)
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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