Abstract: In order to study the environment-friendly tailings cementing material which can replace cement,the tailings were solidified by microbial induced calcium carbonate precipitation (MICP). The effects of concentration and ratio of bacterial liquid on the solidification effect of tailings under different curing methods were studied by experiment. The results show that the curing effect increases first and then becomes smooth with the concentration of bacteria solution during the aerobic bacteria soaking curing and facultative anaerobic bacteria sealing curing. During immersion curing,the two microorganisms will not affect each other;During sealed curing,high concentration of aerobic bacteria will weaken the curing effect. The content of CaCO3 in the specimen directly affects the strength of the specimen,and the change trend of both is the same. Aerobic bacteria and facultative anaerobic bacteria jointly improve the strength of the specimen,which provides a solution to improve the curing effect of MICP technology on tailings.

Key words: microorganism,bacterial concentration,calcium carbonate,tailings,curing