Study and Application of Vertical Transportation System with Solid Backfill Material in Coal Mine

Coal rejects, fly ash and other solid material transported from surface ground to the underground mine would be a base to implement the fully mechanize d solids backfill mining technology.To realize a high efficient and continued transportation of the solids backfill material, a solid material transportation technology with a material feeding well sunk from the surface ground to the underground mine was applied.A vertical feeding well structure including the feeding pipeline, the maintenanc e chamber and the material storage bunker was designed.A rational diameter for the pipeline was studied and obtained.Based on the impact problem occurred during th e solids feeding, cone buffer was designed.Meanwhile, in order to ensure the normal operation of the coal mining face and the safety of the personnel and environment, a study was conducted on the dust contral of the vertical feeding, discharging of high pressure air flow, jamming prevention bunker of the vertical feeding, cleaning of th e material storage bunker and other safety protection technology.The vertical transportation system of the solids material was successfully applied in Wugou Mine.