Abstract: Cementing material is the core of slurry preparation and design in mine tailings cementing filling technology. It's not only the key index which decides backfill strength, but also the most important factor to technological cost. According to the problems like large consumption, high cost and poor performance existed in traditional tailings cementing material, blast furnace slag and its activator as the raw material were discussed, and new cementitious materials with low cost and good performance is developed.

Key words: Slag, Cementing material, Activator, Orthogonal test