Russian Federation
Russian Federation
To investigate and validate the feasibility of extracting rare earth metals from coal-mining byproducts in the Lugansk People’s Republic. This involves analyzing the mineralogical composition of accumulated waste at coal mines and examining the biochemical processes taking place within. Methods: Conducting experiments on biochemical acid leaching of waste rock samples using a culture of sulfate-reducing Thioferrooxidans microorganisms. Additionally, a pure culture of Thioferrooxidans microorganisms will be obtained through established microbiological techniques. Results: A method has been developed and a technology has been proposed for obtaining the rare metals of gallium and germanium from coal-mine waste rock through the natural processes of sulfuric acid formation within the rock. Experimental results indicated that the leaching efficiency of germanium reached 1.6 mg/kg of rock while gallium achieved up to 2 mg/kg of waste rock. This suggests that such waste can be regarded as a potential source of metal-bearing raw materials, providing both environmental and economic benefits for the region. Practical significance: The proposed method will facilitate the utilization of waste rock, thereby minimizing the adverse environmental impacts associated with waste and promoting the production of rear earth metals.
Coal waste deposits, rare metals, aluminum, germanium, gallium, biochemical leaching, sulfuric acid, Thioferrooxidans bacteria
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