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Low temperature fluoride-resistant ore leaching bacterium and bio-leaching process for fluorine-containing uranium ore of low temperature fluoride-resistant ore leaching bacterium

A technology of ore leaching bacteria and low temperature, which is applied in the bioleaching process of high-efficiency extraction of uranium, and in the field of bacterial strains grown in a low-temperature and high-fluorine environment, which can solve the problems of reduced uranium leaching rate, low uranium concentration, and difficulty in qualifying, and achieve bacterial oxidation activity High, increase the concentration of uranium, enhance the effect of operating efficiency

Active Publication Date: 2018-06-12
有研资源环境技术研究院(北京)有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the leaching process of uranium is easily controlled by diffusion. The heap leaching process is a process in which the leaching rate of uranium is continuously reduced. The concentration of uranium in the middle and late stages of leaching is usually low, which is difficult to pass

Method used

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  • Low temperature fluoride-resistant ore leaching bacterium and bio-leaching process for fluorine-containing uranium ore of low temperature fluoride-resistant ore leaching bacterium
  • Low temperature fluoride-resistant ore leaching bacterium and bio-leaching process for fluorine-containing uranium ore of low temperature fluoride-resistant ore leaching bacterium

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Experimental program
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Embodiment 1

[0044] Embodiment 1 Domestication and cultivation of low-temperature fluorine-resistant leaching bacteria

[0045] 1) Collection:

[0046] The ore-leaching bacteria solution was collected from the pit water of a fluorine-containing mine in Jiangxi, and the ore-leaching bacteria solution was inoculated in 9K medium, the inoculation solution accounted for 20%, and the pH value was adjusted to 2.0. 15°C, shaker rotation speed 160rpm. Microscopic counting of bacterial growth to the logarithmic phase, Fe in the culture solution 2+ When the concentration is lower than 0.2g / L, concentrate the leaching bacteria solution, and then inoculate it into a new 9K medium for cultivation. Do this until the growth period of the ore-leaching bacteria is shortened to within 2 days and tends to be stable.

[0047] The cultured ore-leaching bacteria solution was centrifuged to collect the bacteria, and then the bacteria were acclimated to fluorine resistance.

[0048] 2) Acclimatization under l...

Embodiment 2

[0055] Embodiment 2: Bioleaching of certain fluorine-containing uranium ore

[0056] The semi-quantitative fluorescence (XRF) analysis results of fluorine-containing uranium ores in a certain place in Jiangxi are shown in Table 1. Chemical analysis of reduced uranium (U 4+ ) is 0.251%, oxidized uranium (U 6+ ) is 0.062%, so the uranium ore is difficult to achieve a higher leaching rate by general acid leaching process. The chemical analysis shows that the fluorine content in the ore is 0.726%. Although the fluorine content in the raw ore is not very high, after the ore is leached, the fluorine will gradually accumulate with the recycling of the tailing liquid, and the fluorine concentration will reach several grams. The low-temperature fluorine-resistant leaching bacteria Acidithiobacillus ferrooxidans Retech KF-Ⅳ (CGMCC No.13018) domesticated in Example 1 was used as the oxidized Fe 2+ strains, to obtain the strains and Fe 3+ of the immersion solution.

[0057] Table 1 ...

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Abstract

The invention discloses a low temperature fluoride-resistant ore leaching bacterium and a bio-leaching process for fluorine-containing uranium ore of the low temperature fluoride-resistant ore leaching bacterium. The low temperature fluoride-resistant ore leaching bacterium is named as acidithiobacillus ferrooxidans Retech KF-IV. The strain (the low temperature fluoride-resistant ore leaching bacterium) can adapt to relatively low temperature (15 DEG C) and can achieve growth in a fluorine-containing acid environment, and the strain has a capacity of rapidly oxidizing Fe2+ into Fe3+. A leaching agent, which contains ore leaching bacteria and has Fe3+ dual-oxidizing effect, can be produced via the strain, and the leaching agent is applied to bio-leaching of low-grade uranium ore. The strainis stable in activity, good in adaptability and high in uranium ore leaching efficiency, and the strain is especially applicable to dump leaching work in high-altitude cold areas or inland autumn andwinter climates. Meanwhile, the invention also provides an efficient fluorine-containing uranium ore bio-leaching process, and the bio-leaching process is especially suitable for uranium ore dump leaching production at a relatively small scale. The process has the characteristics of being short in technological process, high in resource recovery rate, low in energy consumption and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to low-temperature fluorine-resistant bacteria and its bioleaching process for fluorine-containing uranium ore, in particular to a strain adapted to grow in a low-temperature and high-fluorine environment and using the bacteria to remove fluorine-containing uranium ore Bioleaching process for efficient extraction of uranium. Background technique [0002] my country is a depleted uranium country with a wide distribution of uranium resources and various mineralization types, but the ore-forming age is new, the scale is small, the burial is shallow, and the grade is low. The traditional uranium ore treatment process in my country has mainly experienced three periods: First, from the 1950s to the 1980s, the conventional ore crushing-grinding-stirring leaching-solid-liquid separation-enrichment and purification process was generally used to process uranium The extraction process ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C22B3/18C22B60/02C12R1/01
CPCC12N1/20C22B3/18C22B60/0234C22B60/0256C12N1/205C12R2001/01
Inventor 莫晓兰温建康武彪刘学
Owner 有研资源环境技术研究院(北京)有限公司
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