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Sulfide ore treatment technology by thermoacidophile

A technology of sulfide ore and acidophilic bacteria, applied in the field of bioengineering, can solve problems such as inability to oxidize chalcopyrite, achieve the effects of saving cooling requirements, improving ore leaching efficiency, and increasing oxidation speed

Inactive Publication Date: 2006-09-06
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's copper resources are dominated by chalcopyrite, and TF bacteria at room temperature cannot oxidize refractory chalcopyrite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 (preparation of thermoacidophilic bacterium seed)

[0033] Include the following steps:

[0034] (1) Screening and domestication of strains:

[0035] Liquid medium: yeast extract 0.5g / L, K 2 HPO 4 0.6g / L, MgSO 4 ·7H 2 O 0.3g / L, KCl 0.3g / L, elemental sulfur 1g / L, pH 1.0-2.0.

[0036] Take certain water samples from the high-temperature hot springs in Fuzhou, add the above-mentioned liquid medium, and cultivate them for about 30 days at a temperature of 60-75°C to screen out thermoacidophilic bacteria that are resistant to high temperature and low pH. The microorganisms grown in the medium are added with 20%-30% glycerol, and stored at a low temperature of 1-6°C until use. The bacterial species are mainly microorganisms such as Acidobacillus brucella, or Thiobacillus acidophilus.

[0037] Select the above-mentioned microorganisms stored at low temperature, add them to the liquid medium, control the temperature at 60-75°C, and irradiate the liquid medi...

Embodiment 2

[0041] Embodiment 2 (preparation of production medium)

[0042] The production medium mainly includes the following components: yeast extract 0.1-0.7g / L, K 2 HPO 4 0.5~5g / L, MgSO 4 ·7H 2 O 0.1-0.7g / L, KCl 0.1-1g / L, and its pH value is 1.0-2.0.

[0043] Yeast extract (g / L)

K 2 HPO 4 (g / L)

MgSO 4 ·7H 2 O(g / L)

KCl(g / L)

pH

1

0.1

0.5

0.1

0.1

1.0

2

0.1

0.5

0.1

0.1

2.0

3

0.3

3

0.3

0.5

1.5

4

0.7

5

0.7

1.0

2.0

[0044] Table 2

[0045] Using the 4 kinds of production media configured in Table 2, the leaching rate of the production medium with 3 and 4 components was 1 day faster than that of the production medium with 1 and 2 components.

Embodiment 3

[0046] Embodiment 3 (adopt normal pressure reactor to carry out the biological oxidation leaching reaction of sulfide ore)

[0047] The inoculum prepared in Example 1 is mixed with the sulfide ore and the production medium prepared in Example 2 in an atmospheric pressure reactor, so that the content of the sulfide ore is 5 to 250 g / L, and the volume content of the inoculum is the total The volume is 5-20%, the temperature is 60-75°C, the pH value is 1.0-2.0, aerobic stirring culture;

[0048] Inoculum

[0049] table 3

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PUM

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Abstract

The invention relates the technology of using thermophilic and acidophilic bacteria to treat sulphide field, comprising the following steps: screening and domesticating the thermophilic and acidophilic bacteria to get the high effective biooxidation strain; training it to get inoculation liquid whose thalline density is above 1X108 per liter; mixing the inoculation liquid, sulphide powder and culture medium of thermophilic and acidophilic bacteria, carrying out biological oxidation reaction, and when the copper ion of chalcopyrite in sulphide powder dissolving out above 70%, or 70% lattice structure of chalcopyrite destroyed, terminating the reaction. The technology uses the microbe direct oxidation action and metabolite indirect oxidation action to oxygenize the sulphide in ore to sulphate, destroying the sulphide lattice and discharging the precious metal ion.

Description

technical field [0001] The invention belongs to the field of bioengineering (biometallurgy), in particular to the microbial oxidation process of refractory sulfide ores. Background technique [0002] With the development of the economy and the progress of the society, the demand for gold, copper and other metals in human society is increasing day by day, and the scale of people's collection of metal mines is getting larger and larger. Resources began to attract the attention of countries all over the world. Among the refractory gold ore and copper ore, chalcopyrite or arsenopyrite-type pyrite is the main representative, which is an extremely refractory ore. Refractory ore samples cannot be effectively extracted by traditional metallurgical methods. For example, gold in refractory gold ores forms a lattice structure with other metal compounds, and its properties are extremely stable. Cyanide method cannot effectively extract gold in the lattice. . The structure of the ore ...

Claims

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Application Information

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IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 郭养浩孟春石贤爱
Owner FUZHOU UNIV
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