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Carbonate-siliceous-pelitic-type uranium ore bacterium uranium leaching method

A uranium ore and bacteria technology, applied in the field of high-efficiency bacterial leaching of uranium, can solve the problems of the limitation of extensive development and utilization of uranium ore, low uranium grade and high reduction degree in ore, avoiding the use of sulfuric acid and oxidizing agent, high uranium recovery rate, and lightening The effect of pollution

Inactive Publication Date: 2016-06-29
EAST CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the high degree of reduction of carbon-silicon mudstone-type uranium ores, low uranium grade, rich organic matter, and pyrite often associated with uranium minerals, it is difficult and costly to adopt traditional conventional leaching processes, so that the widespread development and utilization of this type of uranium ore is highly valued. technical limitations
There are research reports (Wu Peisheng et al., Uranium Mining and Metallurgy, No. 2, Volume 3, 1983) that uranium resources are extracted by oxidative roasting acid leaching, flotation, chemical oxidants and pressurized air oxidation under alkaline conditions, but in economically unviable

Method used

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  • Carbonate-siliceous-pelitic-type uranium ore bacterium uranium leaching method
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  • Carbonate-siliceous-pelitic-type uranium ore bacterium uranium leaching method

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Embodiment 1

[0032] Test conditions: Using carbon-silicon mudstone-type uranium ore in Xiushui area, Jiujiang City, Jiangxi Province, the comparison test of bacterial leaching and chemical oxidant leaching was carried out. The diameter of the column is 30cm, the height of the column is 120cm, the weight of the ore is 58kg, the particle size of the ore is -30mm, and the grades of the raw ore uranium are respectively are 0.0353% and 0.0328%. The organic carbon content in the ore is 12.57%, Fe 2 o 3 and FeO accounted for 3.94% and 0.252%, respectively.

[0033] Condition control: bacterial leaching: use bacterial oxidant, chemical leaching: add 3% sodium chlorate oxidant after uranium ore is sterilized. Using the steps (1)-(5) of the present invention, a comparative test of uranium immersion is carried out.

[0034] Test results: The uranium leaching time was 71 days, the uranium grades of the two slags were 0.0114% and 0.0134%, the leaching rates of uranium in slag were 67.71% and 59.15%,...

Embodiment 2

[0036]Test conditions: Use carbon-silicon mudstone-type uranium ore in Xiushui area, Jiujiang City, Jiangxi Province. The diameter of the column is 30cm, the column height is 180cm, the ore weight is 120kg, the ore particle size is -30mm, and the raw ore uranium grade is 0.0252%. The organic carbon content in the ore is 13.10%, Fe 2 o 3 The proportions of FeO and FeO are 4.00% and 0.236%, respectively, and the sulfur content is 1.18%.

[0037] Condition control: adopt steps (1)-(5) of the present invention to carry out bacterial uranium leaching test.

[0038] Test results: The uranium leaching time was 150 days, the uranium grade in slag was 0.00782%, the leaching rate of uranium in slag was 68.97%, and the acid consumption was 0.27%. The curve of uranium leaching rate with time is shown in image 3 , it can be seen from the figure that the uranium leaching rate is faster in the early stage of acid leaching. This is because the hexavalent uranium in the ore is quickly leac...

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Abstract

The invention discloses a carbonate-siliceous-pelitic-type uranium ore bacterium uranium leaching method. The method comprises the following steps: (1) crushing carbonate-siliceous-pelitic-type uranium ore, of which the organic carbon content is greater than or equal to 12.57%, the sulfur content is greater than or equal to 1.18% and the iron content is greater than or equal to 4.19%, until the particle size is less than 30mm; (2) enriching acid mine water and uranium ore collected in the target carbonate-siliceous-pelitic-type uranium ore region to obtain active mixed bacteria, wherein the mixed bacteria can enable the ferrous oxidation rate to be 0.22+ / -0.02 g / (L.H) in an environment with the pH value of 1.7-2; (3) adding the crushed ore into a testing column, and carrying out sulfuric acid acidifying uranium leaching; (4) spraying the prepared bacterial oxidizer into the acidification-preleached ore to carry out bacterial oxidation uranium leaching; and (5) circularly spraying the adsorption raffinate onto the uranium ore subjected to bacterial oxidation leaching, and carrying out raffinate oxidation uranium leaching. The method has the characteristics of low energy consumption, high uranium recovery rate, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of microbial hydrometallurgy, and relates to a method for efficiently leaching uranium by bacteria from low-grade carbon-silicon mudstone-type uranium ore. Background technique [0002] Uranium resources are not only strategic materials urgently needed for national defense construction in our country, but also essential energy materials in economic construction. The carbon-silicon mudstone type uranium deposit is one of the four major types of uranium deposits in my country. Among them, the uranium-containing black rock series type belongs to the type of unconventional uranium resources in my country. The mudstone layer is stable and thick, and it is rich in organic matter, pyrite, and mud , silicon and phosphorus, and the uranium content is mainly between 0.01% and 0.05%. It has considerable reserves and is widely distributed in my country. [0003] Due to the high degree of reduction of carbon-silicon muds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B60/02
CPCC22B3/18C22B60/0234
Inventor 王学刚孙占学刘亚洁李江张凯钧李鹏
Owner EAST CHINA UNIV OF TECH
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