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Bioleaching strain breeding method for copper ore agitation leaching

A stirring leaching and bacteria technology, applied in the field of biometallurgy, can solve the problems of difficult stirring and leaching of leaching bacteria, difficulty in meeting industrial production requirements, and high cost, and achieve the effect of saving cultivation costs and increasing leaching rate

Inactive Publication Date: 2011-02-16
CENT SOUTH UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to develop a low-cost method suitable for copper ore leaching in view of the high cost of the conventional ore leaching bacteria separation method, which is difficult to meet the requirements of industrial production, and the obtained ore leaching bacteria are difficult to adapt to stirring and leaching under high pulp concentration. A New Method of Bacteria Breeding for Agitated Leaching

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  • Bioleaching strain breeding method for copper ore agitation leaching

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Embodiment 1

[0037] Utilize the high-efficiency soaking bacteria combination of the Thiobacillus ferrooxidans strain and Thiobacillus thermophile strain screened by the method of the present invention, the ore particle size is -0.074mm, accounting for 60%, the sulfuric acid mass is 20g, and the liquid-solid volume mass ratio is 2.33L / kg, leaching at constant temperature at 25°C for 1 hour, and at a stirring speed of 100 rpm, the leaching rate of copper reached 95.31%, and the recovery rate was 30% higher than that of acid leaching, and satisfactory test results were obtained.

Embodiment 2

[0039]The high-efficiency soaking bacteria combination composed of Thiobacillus ferrooxidans, Leptospira and Thermophilic Thiobacillus strains screened by the method of the present invention accounts for 60% of the ore particle size of -0.074mm, the mass of sulfuric acid is 20g, and the mass of liquid and solid volume Under the conditions of 2.33L / kg, constant temperature stirring and leaching at 25°C for 1 hour, and stirring speed of 100 rpm, the copper leaching rate reached 96.35%, and the recovery rate was more than 30% higher than that of acid leaching. Satisfactory test results were obtained.

Embodiment 3

[0041] The high-efficiency dipping bacteria combination composed of Leptospira and Thiobacillus thermophilic strains screened by the method of the present invention accounts for 60% of the ore particle size of -0.074mm, the mass of sulfuric acid is 20g, and the volume-to-mass ratio of liquid to solid is 2.33L / kg. Stirring and leaching at constant temperature at 25°C for 1 hour and stirring speed at 100 rpm, the copper leaching rate reached 94.63%, and the recovery rate was more than 30% higher than that of acid leaching. The leaching rate of copper was significantly improved and was satisfied. test results.

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Abstract

The invention discloses a bioleaching strain breeding method for copper ore agitation leaching. The method comprises the following steps: preparing a certain amount of bioleaching strain population by enrichment culture of bioleaching strains; adaptively culturing under a condition that the concentration of ore pulp gradually increases to ensure that the bioleaching strain population can adapt to a biological wet leaching environment with high concentration of the ore pulp under agitation; adopting culture medium suitable for chemical industrial production in bulk to reduce the culture cost of the leaching strain population; and identifying the prepared leaching strain population by utilizing the microarray technology of analyzing the strain population structure so as to obtain the high-efficiency leaching strain combination suitable for copper ore agitation leaching.

Description

technical field [0001] The invention belongs to the field of biometallurgy, and in particular relates to a new method for breeding leaching bacteria suitable for stirring and leaching copper ore. Background technique [0002] Copper is an important strategic resource, widely used in national defense, aerospace, transportation, petrochemical and other fields, and plays an extremely important role in national defense construction and national economy. The world's copper resources are mainly concentrated in Chile, the United States, Zambia and other countries. When using traditional mining, beneficiation, and metallurgical processes to process copper ore resources, the efficiency is low, the process is long, the production cost is high, the environmental pollution is serious, and the resource availability is low. Biometallurgy technology is a high-tech technology that uses the action of microorganisms that use minerals as nutrient substrates to oxidize and decompose minerals t...

Claims

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Application Information

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IPC IPC(8): C12Q1/04C12Q1/68C22B3/18C12N1/20G01N21/64C22B15/00C12R1/01
CPCY02P10/20
Inventor 邱冠周覃文庆刘学端尹华群王军刘新星周洪波康健余润兰申丽张雁生曾伟民朱德庆李启厚
Owner CENT SOUTH UNIV
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