Experimental Study on Tailings Reconstructed Backfill Based on Facultative Anaerobic Bacteria MICP Technology

doi:10.12068/j.issn.1005-3026.2022.09.015

Abstract

Abstract: A tailing gluing method based on microbial induced calcium carbonate precipitation(MICP)technology was presented. Facultative anaerobic bacteria was used to glue tailing in sealed curing conditions， aiming to solve the problem that aerobic bacteria cannot be used in anoxia or anaerobic environment. The control variable method was used to explore the influencing factors of facultative anaerobic bacteria MICP technology in glue tailing test， in which four influencing factors were studied， namely the concentration of bacteria solution， the concentration of cementing solution， the particle size of tailing and the curing temperature. The results show that when the OD₆₀₀ of the bacterial liquid is 1， and the concentration of acetate ion in the cementing solution is 0.6mol/L， the tailings is a mixture of tailings with various particle sizes， and when the curing temperature is 30℃， the cementing effect is best. It is found that the MICP technology of facultative anaerobic bacteria can effectively cementing tailings， which provides a solution for replacing cement by tailings cementing material.

Key words: facultative anaerobic bacteria; induce; calcium carbonate; tailing; backfill

CLC Number:

TP20

JIN Chang-yu， FENG Qing-jie， WANG Qiang. Experimental Study on Tailings Reconstructed Backfill Based on Facultative Anaerobic Bacteria MICP Technology[J]. Journal of Northeastern University(Natural Science), 2022, 43(9): 1322-1328.

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