Experimental Study on the Fine-Grained Uranium Tailings Reinforced by MICP

Sporosarcina Pasteuriiwas chosen for the experiment to study the effect and mechanism of fine-grained uranium tailings reinforced by MICP. The biochemical characteristics of strains and microbial immobilization in uranium tailings were analyzed. The results showed that the CaCO₃production rate is positively correlated with the physiological activity ofSporosarcina Pasteuriiand the concentration of calcium sources, and the higher the solution concentration of CaCl₂, the lower the discharge rate of bacterial liquid from the sand column, but high concentration of CaCl₂solution will affect the uniform distribution and migration of bacteria in the uranium tailings. After 16 days, the direct shear was used to test the reinforcement effects of fine-grained uranium tailings by MICP. The cohesive force and the internal friction angle of fine-grained uranium tailings were increased by 140.1% and 46.7%. The production amount of CaCO₃is 138.89 kg/m³. The results showed that the MICP-reinforced technology can effectively improve the shear strength of the uranium tailings, and the experiment provides a new method for the reinforcement of the fine-grained uranium tailings dam.

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