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Effect of montmorillonite on microbial induced calcium carbonate mineralization and cementation

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Document pages: 13 pages

Abstract: Carbonate mineralizing microorganism is a kind of microorganism that can decompose matrix to produce carbonate in the process of metabolism, and then form calcium carbonate with calcium ions. Using this process, the contaminated uranium tailings can be transformed into solid cement, in which calcium carbonate acts as a binder. In this paper, the morphology of mineralized crystals was studied by controlling the mineralization time and adding different concentrations of montmorillonite (MMT). At the same time, the effect of cementation of uranium tailings by carbonate mineralization was studied by controlling the amount of montmorillonite. The results show that montmorillonite can adjust the crystal morphology of calcium carbonate. In addition, montmorillonite can balance acidity and ions in uraniumtailings; it also can reduce the toxicity of uranium ions on microorganisms. In addition, MMT filling in the gap between the uranium tailings made the cement body more stable. When the amount of MMT is 6 , the maximum strength of the cement body reached 2.18 MPa, which increased by 47.66 compared with that the sample without MMT. Therefore, it is reasonable and feasible to use the MMT to regulate the biocalcium carbonate cemented uranium tailings.

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