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Bioleaching method-uranium leaching from fungus

A technology of biological leaching and fungi, which is applied in the field of biological leaching-fungi leaching of uranium, can solve the problems of inability to reduce acidic wastewater, long metabolic time, slow bacterial growth, etc., to expand the scope of resource utilization, fast growth, fungal leaching, etc. The effect of adaptability

Active Publication Date: 2011-04-06
NANHUA UNIV +1
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  • Application Information

AI Technical Summary

Problems solved by technology

Although microbial leaching is an effective method, the current process has the following outstanding problems: slow growth of bacteria and long metabolic time; it is only suitable for leaching of sulfide ores, while my country's uranium resources are mainly low-grade non-sulfide ores; Reduced generation of acidic wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0032] A method of leaching uranium ore using fungi. The specific steps are:

[0033] (1) Enrichment and cultivation of fungi in uranium ore water, screening out fungi with strong acid production ability, and enriching and preserving them.

[0034] (2) Carry out uranium leaching research on the screened fungi, and screen out strains with good uranium leaching effect.

[0035] (3) Use cheap carbon sources such as straw to ferment fungi on a large scale.

[0036] (4) Take the culture or the filtered culture solution for leaching, and collect the uranium leachate.

[0037] (5) Determination of filtrate volume, uranium ion concentration, pH value and Eh value.

[0038] (6) Recover uranium from qualified filtrate.

[0039] IV embodiment

Embodiment 1

[0040] Example 1, take 5g of 745 ore 501 work area, which has been ground to -200 mesh, and put it in a 150mL Erlenmeyer flask, seal it with kraft paper, and sterilize under high pressure at 121°C for 30min, add 100mL of sterilized PDA medium and 0.5mL of Aspergillus niger mother liquor, and place 30 ℃ constant temperature air bath shaker culture. After cultivating for 7 days, take it out, filter, take a slag sample and dry it, grind it to -200 mesh, analyze the uranium content, and calculate the leaching rate. The results showed that the leaching rate reached 73.81%.

Embodiment 2

[0041] Example 2, take 5g of 745 mine 501 working area, which has been ground to -200 mesh, and put it in a 150mL Erlenmeyer flask, seal it with kraft paper, and sterilize under high pressure at 121°C for 30min, add 100mL of sterilized PDA medium and 0.5mL of Penicillium mother liquor, and place 30 ℃ constant temperature air bath shaker culture. After cultivating for 7 days, take it out, filter, take a slag sample and dry it, grind it to -200 mesh, analyze the uranium content, and calculate the leaching rate. The results showed that the leaching rate reached 73.42%.

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Abstract

The invention relates to a bioleaching method-uranium leaching from fungus. The method comprises the following steps of: using chemical reagents or fermenting low-price carbon source straws to generate fungus of organic acids of citric acid, oxalic acid, malic acid and lactic acid; and leaching uranium out from uranium tailings, tailing residues, uranium barren rocks or uranium ores by utilizing the fungus (1),or fermentation liquor (2) of the fungus, or a fungus mixed fermentation liquor (3), or by adding chemical reagents, such as sulfuric acid and hydrochloric acid to the fungus (1), or the fermentation liquor (2) of the fungus, or the fungus-mixed fermentation liquor (3). The invention has the advantages of convenient material obtainment, low cost, simple and convenient processing steps environmentally-friendly performance, energy saving and the like.

Description

technical field [0001] The invention relates to a green and environment-friendly biological leaching method, which uses fungi capable of producing organic acids such as citric acid, oxalic acid, malic acid, and lactic acid to leach uranium from uranium tailings, tailings, uranium waste rock, or uranium ore. method. 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. At present, my country is actively developing the nuclear power industry, and the demand for natural uranium is increasing day by day. However, with years of mining, high-grade uranium resources have become increasingly scarce, and the current mining grade is only about 0.1%. Respectively less than 85% and 60%. At the same time, the current acid leaching process not only has high requirements for anti-corrosion of equipment and facilities, but also produces a large amount o...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B60/02
Inventor 丁德馨李广悦王永东胡南潘文俊
Owner NANHUA UNIV
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