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Fluoride-resistant ore leaching bacterium and application thereof in efficient leaching process of high-fluoride uranium ore

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

Active Publication Date: 2015-07-01
有研资源环境技术研究院(北京)有限公司
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  • 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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  • Fluoride-resistant ore leaching bacterium and application thereof in efficient leaching process of high-fluoride uranium ore
  • Fluoride-resistant ore leaching bacterium and application thereof in efficient leaching process of high-fluoride uranium ore
  • Fluoride-resistant ore leaching bacterium and application thereof in efficient leaching process of high-fluoride uranium ore

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specific Embodiment approach

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

[0027] (1) Fluoride-resistant leaching bacteria

[0028] The fluorine-resistant ore leaching strain Acidithiobacillus ferrooxidans used in the present invention is isolated from ores freshly taken from the high-fluoride uranium mining area, and preserved in the General Microorganism Center of the China Microbiological Culture Collection Management Committee (CGMCC for short), and the preservation date: July 2013 On January 1, the deposit number is CGMCC NO.7836.

[0029] (2) After the ore mined from the mine is crushed to a particle size of <40mm, it is piled up and heap leached with a height of 3m to 6m, and the high fluorine uranium ore is acidified and pretreated with dilute sulfuric acid with a pH of 1.0 to 2.0;

[0030] (3) The acidification solution obtained fr...

Embodiment 1

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

[0038] (1) Ore properties

[0039] A high fluorine uranium mine located in Shaoguan, Guangdong, the main uranium-containing minerals are pitchblende, uranite, titanium uranite, uranium thorium, etc., the average content of U is 0.20%, uranium mainly exists in the form of reduction, and U in the ore 4+ It accounts for 68.9% of the total uranium. The associated metal minerals are mainly pyrite, hematite, galena, sphalerite, etc., accounting for less than 5.0% of the total, and 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 fluoride uranium ore, fluorit...

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Abstract

The invention relates to a fluoride-resistant ore leaching bacterium and application thereof in an efficient leaching process of high-fluoride uranium ore. The fluoride-resistant acidophilus Acidithiobacillus ferrooxidans is collected at China General Microbiological Culture Collection Center (CGMCC for short) on July 1, 2013 and has a collection number of CGMCC NO.7836. The strain can grow in a fluorine-containing solution under an acidic condition, has fluorine resistance of 3.0g / L or above and also has a relatively good capability of oxidizing Fe<2+> into Fe<3+>. When the fluoride-resistant strain (CGMCC NO.7836) is applied to simulated biological dump leaching process of fluorine-containing uranium ore, 55-day uranium leaching rate is improved by 3.70% as compared with that in an acid leaching method; the uranium leaching rate is improved obviously and production cost is reduced; moreover, since adsorption tail liquid during uranium leaching can be recycled, environment pollution can be reduced. Therefore, the strain can be widely applied to biological leaching.

Description

technical field [0001] The invention relates to the technical field of biological leaching, in particular to a fluorine-resistant ore leaching bacteria and a bioleaching process for uranium ore with high fluorine content. Background technique [0002] my country is a depleted uranium country. So far, more than 200 large and small uranium mines have been identified. The proven uranium resources are 68,000 tU, and the uranium resources to be ascertained are 6,000 tU. The total uranium resources are 74,000 tU. . Although my country's uranium resources are widely distributed and have many types of mineralization, the ore-forming age is new, the scale is small, the burial is shallow, and the grade is low. Judging from the current consumption of uranium, the domestic production of natural uranium basically meets the demand, but cannot meet the medium and long-term needs of the medium and long-term development plan of nuclear power, with an estimated gap of more than 200,000 tU. B...

Claims

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Application Information

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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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