Experimental of pumping gangue into the mined-out area

In order to find solutions to the ground emission of gangue and realize the gangue pumping into the mined-out area, the underground experimental research is conducted in Shandong Huafeng Coalmine. Through the orthogonal experiment, the research deals with the effect of crushed particle size, mass concentration, and the amount of cement added on the pumping, filling, and the cost. As suggested by the experiment, the particle size of gangue has a significant effect on the pumpability of gangue-paste, and the amount of cement added obviously affects the compressive strength of the gangue-paste and the filling cost. According to the best experimented combination of particle size, the amount of cement added and mass concentration, this experimental system brings about an effective filling of the conventional mining-out area, and furthermore, provides a new approach for the disposal of gangue.