Abstract:In order to explore the best parameters of curing cyanidation tailings and realize the optimal test scheme, this thesis uses microbial induced calcium carbonate precipitation (MICP) technology, and through the design of four different calcium sources, to conduct the comparative study of calcium chloride, calcium acetate, calcium nitrate, calcium lactate and four kinds of cementing fluid of urea on curing cyanidation tailings. Effect of MICP curing cyanidation tailings with different calcium sources was discussed. The feasibility of unconfined compressive strength, heavy metal leaching and heavy metal morphology, SEM and XRD characterization were analyzed. Physical and mechanical indicators show that curing effect with calcium acetate and calcium chloride as calcium sources is better than that of with calcium nitrate and calcium lactate as calcium sources. Combined with SEM, FT-IR and XRD results, calcium acetate is the best calcium source. This study can provide scientific basis and reference for engineering application of MICP technology in curing cyanide tailings.