Abstract: To better utilize the tailings to fill underground mined-out areas at a decreased filling cost, the influence of solidifying additive on the initial fluidity and strength of solidified tailing was studied for the tailings from Nanjing Yinmao Lead-zinc Mining Co.Ltd.The results show that the calcium lignosulphonate can improve the initial fluidity of solidified tailing while the bentonite can increase its strength.Under the prerequisite of satisfying the present filling process, raising the tailing concentration as much as possible by adding calcium lignosulphonate or bentonite can effectively reduce the cement consumption so as to decrease the filling cost.

Key words: Tailing, Solidification additive, Fluidity, Strength