Method for reinforcing leaching of chalcopyrite microorganisms

A technology for microbial leaching and leaching microorganisms, which is applied in the direction of improving process efficiency, can solve the problems of low leaching rate and poor oxidative decomposition effect of chalcopyrite, and achieves strong pertinence, long leaching time, and improved oxidative decomposition. Effect

Inactive Publication Date: 2016-08-17
CENT SOUTH UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for strengthening the microbial leaching of chalcopyrite, solve the problem of poor oxidation and decomposition effect of microorganisms on chalcopyrite and low leaching rate, and provide technical guidance for the efficient development and utilization of chalcopyrite

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  • Method for reinforcing leaching of chalcopyrite microorganisms
  • Method for reinforcing leaching of chalcopyrite microorganisms
  • Method for reinforcing leaching of chalcopyrite microorganisms

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Embodiment 1

[0030] Thiobacillus thermophilus Acidithiobacillus caldus , Thermosulfobacillus thiooxidans Sulfobacillus Thermosulfidooxidans , Leptospira siderophilum Leptospirillum ferriphilum and thermophilic ferrobacteria Ferroplasma thermophilum (These four types of strains are all stored in the Wuhan University Preservation Center, located in Wuhan University, No. 299, Bayi Road, Wuchang District, Wuhan City, Hubei Province) The artificial co-cultivation system formed by leaching the chalcopyrite system with pyrite added: the chalcopyrite and pyrite ore were pulverized into particles of about 0.074mm, and put into 9K medium containing microbial enrichment, the leaching condition was 2% pulp concentration, and the microbial concentration of the leaching solution after inoculation was 1.0×10 6 pc / ml, pH value is 2.0, culture temperature is 40 DEG C, shaker rotating speed 170rpm, leaching 30 days, wherein chalcopyrite and pyrite add in equal proportion. When chalcopyrite is ...

Embodiment 2

[0032] Thiobacillus thermophilus Acidithiobacillus caldus , Thermosulfobacillus thiooxidans Sulfobacillus Thermosulfidooxidans , Leptospira siderophilum Leptospirillum ferriphilum and thermophilic ferrobacteria Ferroplasma thermophilum The formed artificial co-cultivation system is used to leach the chalcopyrite system added with pyrite and sphalerite: pulverize the chalcopyrite, pyrite and sphalerite ore into particles of about 0.074mm, and put them into the artificial co-cultivation system In the 9K medium, the leaching condition is that the pulp concentration is 2%, and the microbial concentration of the leaching solution after inoculation is 1.0×10 6 pc / ml, pH value is 2.0, culture temperature is 40 ℃, shaker rotating speed 170rpm, leaching 30 days, wherein chalcopyrite, pyrite and sphalerite are to add in equal proportion. When chalcopyrite is in the microbial leaching system alone, after 9 days of leaching, the pH value is 1.75 ( figure 1 ), Eh is 662 ( ...

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Abstract

The invention discloses a method for reinforcing leaching of chalcopyrite microorganisms. The method comprises the steps that (1) a chalcopyrite sample, a pyrite sample and a blende sample are crushed into particles; (2) a culture medium, chalcopyrite, blende to be added and / or pyrites to be added are subjected to high-temperature and high-pressure sterilization; (3) the sterilized samples are put into a shake flask with the culture medium according to the requirement, and the microorganisms in bioleaching are inoculated; (4) the shake flask in the step (3) is placed in a constant-temperature shaking table to be cultured; and (5) the leaching efficiency of copper in the leaching process is measured. By adding the pyrites and the blende in a chalcopyrite microorganism leaching system, pH of a solution is low, the concentration of iron ions and the redox potential are high, oxygenolysis of the chalcopyrite is reinforced under the synergistic effect of biological, physical and chemical factors, and the leaching rate of the copper is increased. Compared with microorganism leaching results obtained without adding any minerals, the leaching rate of the copper is increased by 5.0%-5.5%. The method provides technological guidance for efficient leaching of the chalcopyrite.

Description

technical field [0001] The invention belongs to the technical field of microbial metallurgy of sulfide ores, and in particular relates to a method for strengthening microbial leaching of chalcopyrite. Background technique [0002] With the rapid development of society, people's demand for mineral resources is increasing. The traditional metallurgical process not only consumes a lot of energy, but also pollutes the living environment that people can survive. Therefore, the reaction is mild, the environment is friendly, and the process Simple, low energy consumption and high efficiency bioleaching technology is becoming more and more important to us. The use of microorganisms to recover heavy metal ions from ores is a biotechnological process established all over the world. At present, this technology is mainly applied to copper, nickel, gold and silver. [0003] Chalcopyrite minerals are low in grade and complex in structure, which is not conducive to continuous bioleaching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0065Y02P10/20
Inventor 尹华群
Owner CENT SOUTH UNIV
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