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Biological gold extraction method of difficult separation concentrate and special equipment

A concentrate and refractory technology, applied in the field of metallurgy, can solve the problems of difficult safe operation, environmental pollution, and high cost, and achieve the effects of no environmental pollution, saving water resources, and improving recovery rate

Inactive Publication Date: 2003-04-16
山东天承生物金业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention mainly solves the problems of serious environmental pollution, difficult safe operation, large investment and high cost in the prior art

Method used

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  • Biological gold extraction method of difficult separation concentrate and special equipment
  • Biological gold extraction method of difficult separation concentrate and special equipment
  • Biological gold extraction method of difficult separation concentrate and special equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1, see figure 1 , 2 , 3, first carry out the activation of bacterial inoculum and expand culture, the bacterium that adopts is a kind of mesophilic mixed bacteria, mainly comprises Thiobacillus ferrooxidans 26%, Thiobacillus thiooxidans 17%, Helicobacter ferrooxidans 57%. The mixed bacteria is collected from the mine pit, the working temperature is 40 degrees, the pH value is 0.8-1.2, and the number of activated bacteria is 10 8 -10 9 per milliliter culture solution, the oxidation rate of sulfur in gold concentrate is 85%.

[0024] Adopt the following step-by-step scale-up culture method:

[0025] Primary culture: Shake flask culture in the laboratory;

[0026] Secondary cultivation: 3 cubic meters of stainless steel tank cultivation;

[0027] Tertiary cultivation: 80 cubic meters of stainless steel tank cultivation; among them, the second and third cultivations need to meet the following conditions:

[0028] a. The particle size of gold concentrate should...

Embodiment 2

[0041] Embodiment 2, different from Example 1, is that in the activation and expansion culture process of the bacterial inoculum, the bacteria used are a kind of mesophilic mixed bacteria, which mainly include Thiobacillus ferrooxidans 34%, Thiobacillus thiooxidans 10% %, Spirulina ferrooxidans 58%.

Embodiment 3

[0042] Embodiment 3, different from Example 1, is that in the activation and expansion culture process of the bacterial inoculum, the bacteria used are a kind of mesophilic mixed bacteria, which mainly include Thiobacillus ferrooxidans 31%, Thiobacillus thiooxidans 15% %, Spirulina ferrooxidans 54%.

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Abstract

A biological process for extracting gold from the metallurgical ore concentrate difficult to separate includes such steps as grinding the said ore concentrate, preparing slurry, oxidizing with mesophilic bacteria mixture at 35-45 deg.C by 4 stages for 2-6 days, washing, neutralizing and cyanating the oxidized dregs to extract gold. Its advantages are high recovery rate of gold, low loss, and reduced environmental pollution.

Description

1. Technical field: [0001] The present invention relates to the technical field of metallurgy, specifically pretreating refractory metallurgical concentrates with microorganisms to remove pyrite and arsenopyrite wrapped on the surface of fine gold particles, so that the refractory metallurgical concentrates can be easily extracted by cyanidation The method of gold and its special equipment. 2. Background technology: [0002] China's gold industry has proved more than 1,700 tons of geological reserves of gold at the end of the "Eighth Five-Year Plan", of which gold resources that are easy to smelt have been mostly utilized, and there are still more than 1,000 tons of gold resources that are difficult to smelt and smelt, which are difficult to develop and utilize. The fine particles of gold in metallurgical concentrate are wrapped by metal minerals such as pyrite and arsenopyrite. It is difficult to dissociate the gold monomer by traditional gold extraction methods. The direct...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 张安康公锡泰杨立何勇军焦方智王俊峰刘学山张国兴邱炳文张建军
Owner 山东天承生物金业有限公司
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