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A fluorine-resistant ore leaching bacteria and its high-efficiency leaching process applied to high-fluoride uranium ore

A technology of ore leaching bacteria and fluorine resistance, which is applied in the field of bioleaching process and fluorine-resistant ore leaching bacteria, can solve the problems of difficult control of environmental pollution, serious equipment loss, and inability to continue to use, etc., and achieves short leaching time, improved recovery rate, and strong The effect of fluorine resistance

Active Publication Date: 2018-01-12
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bioheap leaching is used for shallow uranium mines that are easy to mine. The main process is divided into heaping, acidification, bacterial liquid production and spraying. It has the characteristics of low cost and environmental friendliness, and is currently the best applied process; for The low-grade uranium ore with good permeability adopts the biological in-situ leaching process, and the prepared solution is used to leach uranium under natural burial conditions through drilling engineering (liquid injection drilling, liquid pumping drilling). The cost is low, but the environment is polluted. Difficult to control; biological stirring process and tank leaching process are suitable for leaching higher-grade uranium ore. Biological tank leaching has designed a multi-tank series leaching process, which has the advantage of high uranium recovery rate, but these two processes have equipment loss Serious and costly features
For the bioleaching process of high fluorine uranium ore, the bioleaching process of general uranium ore cannot be followed

Method used

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  • A fluorine-resistant ore leaching bacteria and its high-efficiency leaching process applied to high-fluoride uranium ore
  • A fluorine-resistant ore leaching bacteria and its high-efficiency leaching process applied to high-fluoride uranium ore
  • A fluorine-resistant ore leaching bacteria and its high-efficiency leaching process applied to high-fluoride uranium ore

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specific Embodiment approach

[0026] The fluorine-resistant leaching bacteria provided by the invention is applied to an efficient leaching process suitable for high-fluorine uranium ore. The specific implementation is as follows:

[0027] (1) Fluoride-resistant leaching bacteria

[0028] The fluoride-resistant leaching strain Acidithiobacillus ferrooxidans used in the present invention was isolated from freshly collected ore from the high-fluorine uranium mine area and preserved in the General Microbiology Center of the China Microbial Culture Collection Management Committee (CGMCC), preservation date: July 2013 On the 1st, the deposit number was CGMCC NO.7836.

[0029] (2) The ore mined from the mine is crushed to After the particle size is less than 40mm, pile up and heap leaching the pile height is 3m-6m, and the high-fluoride uranium ore is acidified and pretreated with dilute sulfuric acid with pH=1.0-2.0;

[0030] (3) The acidified solution obtained by ore acidification pretreatment contains K suitable for...

Embodiment 1

[0037] Example 1 Application of fluoride-resistant leaching bacteria to leaching a high-fluorine uranium ore

[0038] (1) Nature of ore

[0039] A high-fluorine uranium mine located in Shaoguan, Guangdong. The main uranium-bearing minerals are bituminous uranium, uranium, ilmenite, uranium thorium, etc. The average content of U is 0.20%. Uranium mainly exists in reduced form. U 4+ It accounts for 68.9% of the total uranium. ; Associated metal minerals are mainly pyrite, hematite, galena, sphalerite, etc. The total amount is less than 5.0%. The average content of pyrite in the ore is 0.45%; non-metallic minerals account for more than 90.0% of the total , Mainly quartz, fluorite, followed by calcite, dolomite, chlorite, hydromica, potassium (sodium) feldspar, apatite, etc. The average content of F in the ore is 2.15%, and the fluorine content is relatively high.

[0040] In the high-fluorine uranium ore, fluorite and apatite are easily dissolved in acid during acidification treatment,...

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Abstract

A fluoride-resistant ore leaching bacteria and its high-efficiency leaching process applied to high-fluorine uranium ore. The fluorine-resistant Acidithiobacillus ferrooxidans has been deposited in the General Microorganism Center of China Committee for Culture Collection of Microorganisms (CGMCC for short), with the date of deposit: July 1, 2013, and the deposit number is CGMCC NO.7836. The strain is adapted to grow under acidic conditions and in fluorine-containing solution environments, has the ability to tolerate fluorine above 3.0 g / L, and has a strong ability to oxidize Fe2+ to Fe3+. Applying fluorine-resistant strain CGMCC NO.7836 to the simulated bioheap leaching process of fluorine-containing uranium ore, the 55-day uranium leaching rate increased by 3.70% compared with the acid leaching method, which can significantly increase the uranium leaching rate and reduce production costs. Tail liquid recycling can reduce environmental pollution and can be widely used in bioleaching.

Description

Technical field [0001] The invention relates to the technical field of biological leaching, in particular to a fluorine-resistant leaching bacteria and a biological leaching process for uranium ore with higher fluorine content. Background technique [0002] my country is a country with depleted uranium. Up to now, more than 200 large and small uranium mines have been identified. The identified uranium resources are 68,000 tU, and the unidentified uranium resources are 6 million tU, and the total uranium resources are 74,000 tU. . Although my country's uranium resources are widely distributed and have many types of mineralization, they have a new age, small scale, shallow burial, and low grade. Judging from the current consumption of uranium, domestic production of natural uranium basically meets the demand, but cannot meet the long-term needs of the mid- and long-term development plan for nuclear power. The gap is expected to exceed 200,000 tU. By 2020, the nation’s installed nu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/20C22B3/18C22B60/02C12R1/01
Inventor 莫晓兰温建康陈勃伟武名麟
Owner 有研资源环境技术研究院(北京)有限公司
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