Experimental Study on Leaching of a Low-grade Phosphate Ore with Thiobacillus Ferrooxidans

WANG Dapeng; QU Guanghua; SUN wei

doi:10.13779/j.cnki.issn1001-0076.2023.02.020

2023 Vol. 43, No. 2

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Article navigation > Conservation and Utilization of Mineral Resources > 2023 > 43(2): 131-137

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WANG Dapeng, QU Guanghua, SUN wei. Experimental Study on Leaching of a Low-grade Phosphate Ore with Thiobacillus Ferrooxidans[J]. Conservation and Utilization of Mineral Resources, 2023, 43(2): 131-137. doi: 10.13779/j.cnki.issn1001-0076.2023.02.020

Citation:

WANG Dapeng, QU Guanghua, SUN wei. Experimental Study on Leaching of a Low-grade Phosphate Ore with Thiobacillus Ferrooxidans[J]. Conservation and Utilization of Mineral Resources, 2023, 43(2): 131-137. doi: 10.13779/j.cnki.issn1001-0076.2023.02.020

Experimental Study on Leaching of a Low-grade Phosphate Ore with Thiobacillus Ferrooxidans

1.
Mining College , Guizhou University, Guiyang 550025, Guizhou, China
2.
State and Local Joint Key Laboratory of Efficient Utilization of Superior Mineral Resources in Karst Areas, Guiyang 550025, Guizhou, China
3.
Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang 550025, Guizhou, China

Received Date: 29 November 2022

Publish Date: 25 April 2023

Abstract

Abstract

Thiobacillus ferrooxidans was used to leach a low-grade phosphate ore. The optimal growth conditions of Thiobacillus ferrooxidans was investigated, and the bacteria that could resistant to high slurry concentrations was obtained by step-by-step transfer of domestication. Domesticated bacteria was used to leach phosphate ore to achieve the purpose of improving the leaching rate. A phosphate mine in Guizhou with a grade of 13.17% P₂O₅ was used as the research object. The results showed that the activity of Thiobacillus ferrooxidans oxide was strong under the conditions of temperature of 33 ℃ and initial pH of 1.6, and the higher concentration was 1.63×10⁸mL⁻¹. The P₂O₅leaching rate of thiobacillus ferrooxidans after domestication was 76.6%, and the corresponding thiobacillus ferrooxidans without domestication was only 60.3%. When the mass concentration of slurry was 1%, 3%, 5%, 7% and 9%, the leaching rates of phosphate ore were 56.4%, 70.4%, 75.2%, 64% and 44.7%, respectively. The leaching rate of phosphate ore with pyrite as nutrient was 78.6%, which was 17.1 percentage points higher than the leaching rate with sulfur as a nutrient. The study improves the leaching rate of low-grade phosphate ore, and it shortens the phosphate leaching time.
- low grade phosphate rock /
- thiobacillus ferrooxidans /
- microbiological leaching /
- leaching rate

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References

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