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Low-temperature fluorine-resistant leaching bacteria and its bioleaching process for fluorine-containing uranium ore

A technology of 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 low uranium concentration, difficulty in passing standards, and reduced uranium leaching rate.

Active Publication Date: 2021-06-08
有研资源环境技术研究院(北京)有限公司
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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 fluorine-resistant leaching bacteria and its bioleaching process for fluorine-containing uranium ore
  • Low-temperature fluorine-resistant leaching bacteria and its bioleaching process for fluorine-containing uranium ore

Examples

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Effect test

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 fluorine-resistant ore leaching bacterium and a process for applying it to uranium ore bioleaching. The name of the low-fluorine-resistant ore leaching bacterium is Acidithiobacillus ferrooxidans Retech KF‑IV. The strain can adapt to the growth of low temperature (15°C) and fluorine-containing acidic environment, and has the ability to rapidly oxidize Fe 2+ for Fe 3+ Ability. This strain can be used to produce leaching strains and Fe 3+ A leaching agent for dual oxidation, used for bioleaching of low-grade uranium ores. This strain has stable activity, good adaptability, and high uranium ore leaching efficiency, and is especially suitable for heap leaching operations in high-altitude cold areas or inland autumn and winter climates. At the same time, the invention also provides a high-efficiency biological leaching process for fluorine-containing uranium ore, which is especially suitable for heap leaching production of small-scale uranium ore. This process has the characteristics of short process, high resource recovery rate, low energy consumption and environmental friendliness.

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 Patents(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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