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Bacteria agitation leaching method for uranium ore

A stirring leaching and uranium ore technology, which is applied in the field of biometallurgy, can solve the problems of complex recovery process, unfriendly environment, and long leaching cycle, and achieve the effects of environmental friendliness, simple equipment, and shortening the leaching cycle

Active Publication Date: 2014-02-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of my country's nuclear power industry, the contradiction between supply and demand of uranium resources has become more prominent; conventional acid leaching has problems such as high acid consumption, long leaching cycle, unfriendly environment, low uranium concentration, and complicated recovery process. Moreover, additional consumption of oxidants, such as sodium chlorate and pyrolusite, is far from being able to solve this problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Inoculate the mixed bacterial solution containing Microspiral ferrooxidans, Thiobacillus ferrooxidans and Thiobacillus acidophilus thiooxidans into 9K medium to make a culture medium, and the inoculum amount is the ratio of the mixed bacterial solution to the 9K medium. The volume ratio is 1:10;

[0022] Use a sulfuric acid solution with a concentration of 2N to adjust the pH value of the culture medium to 1.0; introduce air into the culture medium and stir for cultivation, and the amount of air introduced is 0.01m per liter of culture medium. 3 / h, the stirring speed is 600rpm, and the temperature of the culture medium is controlled at 44-60°C, the pH value of the culture medium is 1.0-2.0, and the culture time is 24h, and the leaching bacteria liquid is made;

[0023] The part of the selected uranium ore powder with a particle size of ≤74 μm accounts for 90% of the total weight of all uranium ore powder, and the weight content of uranium is 0.179%;

[0024] Add water...

Embodiment 2

[0028] Inoculate the mixed bacterial solution containing Microspiral ferrooxidans, Thiobacillus ferrooxidans and Thiobacillus acidophilus thiooxidans into 9K medium to make a culture medium, and the inoculum amount is the ratio of the mixed bacterial solution to the 9K medium. The volume ratio is 1:15;

[0029] Use a sulfuric acid solution with a concentration of 1N to adjust the pH value of the culture solution to 1.5; introduce air into the culture solution and stir for cultivation, and the amount of air introduced is 0.02m per liter of culture solution. 3 / h, the stirring speed is 1400rpm, and the temperature of the culture medium is controlled at 44-60°C, the pH value of the culture medium is 1.0-2.0, and the culture time is 12h, and the leaching bacteria liquid is made;

[0030] The part of the selected uranium ore powder with a particle size of ≤74μm accounts for 81% of the total weight of all uranium ore powder, and the weight content of uranium is 0.382%

[0031] Add ...

Embodiment 3

[0035] Inoculate the mixed bacterial solution containing Microspiral ferrooxidans, Thiobacillus ferrooxidans and Thiobacillus acidophilus thiooxidans into 9K medium to make a culture medium, and the inoculum amount is the ratio of the mixed bacterial solution to the 9K medium. The volume ratio is 1:20;

[0036] Use a sulfuric acid solution with a concentration of 2N to adjust the pH value of the culture solution to 2.0; introduce air into the culture solution and stir for cultivation, and the amount of air introduced is 0.03m per liter of culture solution. 3 / h, the stirring speed is 800rpm, and the temperature of the culture medium is controlled at 44-60°C, the pH value of the culture medium is 1.0-2.0, and the culture time is 16h, and the leaching bacteria liquid is made;

[0037] The part of the selected uranium ore powder with a particle size of ≤74μm accounts for 60% of the total weight of all uranium ore powder, and the weight content of uranium is 0.527%

[0038] Add w...

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Abstract

A bacteria agitation leaching method for a uranium ore belongs to the technical field of biological metallurgy. The method is conducted according to the following steps: (1) inoculating a mixed bacteria solution containing ferrous oxide micro-spirillum, eosino-ferrous oxide thiobacillus and eosino-thiobacillus thiooxidans into a culture medium to prepare a culture solution; (2) regulating the pH value, introducing air and stirring to culture so as to prepare a leaching bacteria solution; (3) adding water into uranium ore powder to prepare an ore pulp, regulating the pH value with sulfuric acid, then adding the ore pulp into the leaching bacteria solution to prepare a leaching mixture solution; (4) regulating the pH value of the leaching mixture solution by using the sulfuric acid, introducing air and stirring to leach. According to the method, the leaching rate of the uranium is remarkably improved, the acid consumption is reduced, and by improving dynamics in the mineral leaching process, the leaching period is shortened, and the leaching rate is increased. The method provided by the invention has the advantages of low production cost, low investment, simple equipment, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, in particular to a bacterial stirring leaching method for uranium ore. Background technique [0002] Uranium is a raw material for nuclear power and nuclear weapons, and plays an important role in national economic development and national defense construction. With the continuous expansion of human demand for energy, nuclear energy, as a green energy, has great room for development, especially in China. The main characteristics of my country's uranium ore resources are that there are many and complex types of ores, most of which are middle and low-grade uranium ores, uneven mineralization, and a large proportion of refractory uranium ores. In recent years, with the rapid development of my country's nuclear power industry, the contradiction between supply and demand of uranium resources has become more prominent; conventional acid leaching has problems such as high acid consumption, long l...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B60/02
Inventor 杨洪英佟琳琳李鹏
Owner NORTHEASTERN UNIV
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