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Method for leaching metallic copper in copper pyrites by using amino acid reinforced microorganisms

A microbial leaching and chalcopyrite technology, which is applied in the field of mining and metallurgy technology and the field of microorganisms, can solve the problems of large-scale industrialization of chalcopyrite with low leaching rate, and achieve the effects of accelerating electron transfer, improving methods, and being easy to obtain

Inactive Publication Date: 2014-05-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Both of the above two patents use microorganisms to leaching metallic copper in chalcopyrite, which has the advantages of environmental friendliness and low economic cost, but the leaching rate needs to be further improved, and at the same time, the low leaching rate is also a limitation for bioleaching chalcopyrite. Main reasons for large-scale industrialization

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  • Method for leaching metallic copper in copper pyrites by using amino acid reinforced microorganisms
  • Method for leaching metallic copper in copper pyrites by using amino acid reinforced microorganisms
  • Method for leaching metallic copper in copper pyrites by using amino acid reinforced microorganisms

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Embodiment 1

[0043] Cysteine ​​strengthens the leaching of chalcopyrite by L.f (Leptospirillum ferrooxidans) bacteria, comprising the following steps:

[0044] (1) Culture of bacteria

[0045] That is to use 9k medium (with iron): ammonium sulfate 3g / L, potassium sulfide 0.1g / L, magnesium sulfate, heptahydrate 0.5g / L, anhydrous dipotassium hydrogen phosphate 0.5g / L, calcium nitrate 0.01g / L , ferrous sulfate heptahydrate 44.3g / L, 2.5mol / L sulfuric acid to adjust the pH to 2.0, inoculate the bacteria with 10% inoculum and cultivate in the TS-200B constant temperature shaker, the culture temperature is 40 ℃, shaker The rotation speed is 180rpm; the cultivation is stopped when the cultivation reaches the logarithmic phase, and the bacterial liquid is centrifuged and collected by using a Heraeus Multifuge X1R refrigerated centrifuge and a F15-6x100y rotor.

[0046] (2), add cysteine ​​chalcopyrite microbial leaching

[0047] Transfer the bacteria collected by centrifugation in step (1) to 9k ...

Embodiment 2

[0052] Cysteine ​​enhanced mixed bacteria (Leptospirillum ferriphilum and Sulfobacillus thermotolerans) leaching chalcopyrite, including the following steps:

[0053] (1), the cultivation of bacteria (with embodiment 1);

[0054] (2), add cysteine ​​chalcopyrite microbial leaching

[0055] The thalline collected by centrifugation in step (1) is transferred to 9k basal medium (iron-free): ammonium sulfate 3g / L, potassium sulfide 0.1g / L, magnesium sulfate, heptahydrate 0.5g / L, anhydrous hydrogen phosphate Dipotassium 0.5g / L, calcium nitrate 0.01g / L, 2.5mol / L sulfuric acid to adjust the pH to 2.0, and dilute to 108 bacteria / ml; then add cysteine, the concentration of cysteine ​​is respectively 0mol / L, 10 -2 mol / L, 10 -3 mol / L, 5×10 -4 mol / L, 10 -4 mol / L; Clean the self-made chalcopyrite working electrode with absolute ethanol, put it into the above bacterial solution, and soak for 12 hours.

[0056] The self-made chalcopyrite electrode was soaked for 12 hours before electro...

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Abstract

The invention relates to a method for leaching metallic copper in copper pyrites by using amino acid reinforced microorganisms. The method for leaching metallic copper in copper pyrites by using microorganisms is implemented as follows: microorganisms are adsorbed on the surface of copper pyrites to act with the copper pyrites, so that metallic copper ions in crystal lattices of the copper pyrites enter a solution; meanwhile, metabolites produced by the microorganisms have a chemical reaction with the copper pyrites, so that metallic copper in the copper pyrites is dissolved out; aminothiopropionic acid with concentration of 5*10<-3>-5*10<-4> mol / L is added in the process of leaching metallic copper in the copper pyrites by using the microorganisms. Compared with the prior art, in the process of leaching metallic copper in copper pyrites by using microorganisms, aminothiopropionic acid with certain concentration is added so as to improve the biological leaching efficiency of the copper pyrites; the method disclosed by the invention is simple in operation, and added aminothiopropionic acid is easily obtained and is non-toxic and harmless, therefore, the method for improving the microorganism leaching speed of the copper pyrites by using aminothiopropionic acid is simple and easy, and is applicable to the microorganism leaching processes of various copper pyrites.

Description

technical field [0001] The invention belongs to the technical field of mining and metallurgy and the field of microorganisms, and in particular relates to a method for using amino acid to strengthen microorganisms to leaching metallic copper in chalcopyrite. Background technique [0002] Microbial leaching of chalcopyrite is a new type of hydrometallurgical technology. Compared with traditional pyrometallurgy technology, microbial wet leaching of chalcopyrite can not only recover metals from chalcopyrite economically and reasonably, especially for low-grade Chalcopyrite and its tailings do not produce sulfur dioxide by-products, are environmentally friendly and can save economic costs. [0003] Chinese patent CN101792728B discloses a method for leaching metals from metal ores and special strains thereof. The bacterium can grow in the environment of low pH value, high temperature and high salinity, and the bacterium can leach copper ions from chalcopyrite with a leaching rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 郑红艾张琛郭毅周笑绿时鹏辉吴阳王中宏李炳越
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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