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Method for leaching weathering crust illuviation type rare earth ore by using microorganisms

A weathered crust leaching type, microbial leaching technology, applied in the direction of improving process efficiency, can solve problems such as large amount of chemical agents, soil and ecological damage, and more impurities leaching out, and achieves good leaching effect, less impurities leaching, source wide range of effects

Active Publication Date: 2021-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for leaching weathering crust elution-type rare earth ores by using microorganisms, so as to solve the common problems in the chemical leaching process of weathering crust leaching-type rare earth ores at present: high production cost, large amount of chemical agents, and many impurities dissolved , environmental pollution, serious soil and ecological damage, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Adopt Saccharomyces rouxii ATCC14679 (purchased Saccharomyces rouxii ATCC14679) to activate the strain, and use liquid medium (yeast powder 10g / L, glucose 10g / L, K 2 HPO 4 0.6g / L, MgSO 4 0.4g / L) for 2 days; until the initial bacterial concentration ≥ 1.0×10 7 cells / mL to obtain a bacterial suspension.

[0026] Mix the bacterial suspension with the weathered crust leaching type rare earth ore at a liquid-solid ratio of 10:1, and then adjust the bioleaching process to maintain the pH at 3.0, the temperature at 30°C, the dissolved oxygen concentration at 0.36mmol / L, and the system potential at 530 ~560mV, leaching for 8h. Samples were taken, and the concentration of rare earth elements was measured by ICP-OES method and the leaching rate was calculated. The final leaching rate of rare earth elements was 97.96%, and the leaching rate of aluminum impurity elements was 14.8%.

Embodiment 2

[0028] Adopt Pseudomonas aeruginosa (purchased Pseudomonas aeruginosa ATCC27853), after the strain is activated, use liquid medium (NaNO 3 3g / L, sucrose 30g / L, K 2 HPO 4 1g / L, MgSO 4 0.5g / L, KCl 0.5g / L, FeSO 4 0.01g / L) for 5 days; until the initial bacterial concentration ≥ 1.0×10 7 cells / mL to obtain a bacterial suspension.

[0029] Mix the bacterial suspension with the weathered crust leaching type rare earth ore at a liquid-solid ratio of 8:1, then adjust the bioleaching process to maintain the pH at 2.0, the temperature is 37°C, the dissolved oxygen concentration is 0.39mmol / L, and the system potential is controlled at 497 ~525mV, leaching for 8h. Samples were taken, and the concentration of rare earth elements was measured by ICP-OES method and the leaching rate was calculated. The final leaching rate of rare earth elements was 96.51%, and the leaching rate of aluminum impurity elements was 14.8%.

Embodiment 3

[0031] Yarrowia lipolytica (purchased Yarrowialipolytica ATCC30162) was used to activate the strain, and liquid medium (NaNO 3 3g / L, sucrose 30g / L, K 2 HPO 4 1g / L, MgSO 4 0.5g / L, KCl 0.5g / L, FeSO 4 0.01g / L) for 3 days; until the initial bacterial concentration ≥ 1.0×10 7 cells / mL to obtain a bacterial suspension.

[0032] Mix the bacterial suspension with the weathered crust elution-type rare earth ore at a liquid-solid ratio of 7:1, and then adjust the bioleaching process to maintain the pH at 4.0, the temperature is 30°C, the dissolved oxygen concentration is 0.32mmol / L, and the system potential is controlled at 563 ~587mV, leaching for 6h. Samples were taken, and the concentration of rare earth elements was measured by ICP-OES method and the leaching rate was calculated. The final leaching rate of rare earth elements was 93.27%, and the leaching rate of aluminum impurity elements was 16.4%.

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Abstract

The invention discloses a method for leaching weathering crust illuviation type rare earth ore by using microorganisms. The method for leaching the weathering crust illuviation type rare earth ore by using the microorganisms comprises the following steps that (1) the microorganisms are activated and cultured to obtain a bacterial suspension; and (2) weathering crust illuviation type rare earth is leached by adopting the bacterial suspension, thalli or metabolites without the thalli as a leaching medium to obtain a leaching solution containing the rare earth. The microorganisms selected in the method for leaching the weathering crust illuviation type rare earth ore are environmentally friendly and safe, generally exist in nature and are wide in source, and some microorganisms are beneficial to environmental pollutant degradation and ecological restoration and improvement; and the metabolites generated in the microbial leaching process generally contain functional groups such as hydroxyl and carboxyl, the surfaces of microbial cell membranes or cell walls can also contain active ingredients acting with the rare earth, rare earth elements can be leached through complexation and chelation, the leaching effect is good, the selectivity is strong, the impurity dissolution is less, the cost is low, and the process is green and environment-friendly.

Description

technical field [0001] The invention belongs to the fields of hydrometallurgy and mineral processing, and in particular relates to a method for leaching weathering crust leaching type rare earth ore by using microorganisms. Background technique [0002] Rare earth element (RE or R) refers to the lanthanide elements, scandium and yttrium in the chemical periodic table, a total of 17 elements. According to the atomic structure and physical and chemical properties of rare earth elements, they are usually divided into light rare earths and heavy rare earths. Heavy rare earths are widely used in steel, electronics, petroleum and other industries, and are essential raw materials for the manufacture of cutting-edge weapons. In the future, with the rapid development of new energy vehicles, wind power, robots and other industries, demand is expected to grow rapidly, which will form a strong support for the prices of major rare earth products. [0003] China is the country with the ...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B59/00
CPCC22B3/18C22B59/00Y02P10/20
Inventor 刘学端曾伟民申丽赵红波吕鑫邱冠周
Owner CENT SOUTH UNIV
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