Study on settling performance of total tailings slurry mixed with cement in Xishimen iron mine

The cementation and discharging process of tailings is to add the cement of a certain ratio to the total fillings slurry,stir uniformly,concentrate,dehydrate,consolidate and pile on the ground surface.Taking the Xishimen iron ore full tailings as the research material and adding 3% cement to the full tailings,the experiments are carried to study on the settlement characteristics of different concentration total tailings slurry mixed with cement of different concentration and the law of the influence of the concentration of the fillings slurry,category and hydration degree of cementitious materials on the settlement performance of the mixed slurry are analyzed.The results show that:a.the settling velocity of mixed slurry of 3% cement adding to the tailings is obviously faster than that of the total tailings slurry and both the settling density and the unit weight can reach a maximum in 20 minutes;b.the settlement of the mixed slurry is influenced by the hydration degree of the cement and the settling velocity can slow down by adding cementitous materials in advance.;c.the settlement law of total fillings slurry adding in total fillings curing agent has much similarities as that of the total fillings slurry adding in slag portland cement while much difference from that of the total fillings slurry adding in ordinary portland cement.