Description

The technology won the second prize of International Science and Technology, which is the highest award in the field of national coal industry science and technology.Built and put into operation in ***8, Jizhong Energy Group Xingtai Coal Mine had production capacity of 1.*5 million tons in ***9. After more than *0 years of exploitation, the remaining reserves are *2.*6 million tons, and mainly are marginal coal pillar, which becomes more and more difficult to exploit. As the mine is located in the North China Plain of Taihang Mountain eastern foothill, there are intensive villages on the ground, which tying up lots of coal resources. The safety pillars reserves of various villages and alluvial layers can *8 million tons.
Basic plan:
Gangue (waste rock) filling process, designed by our company for Xingtai Coal Mine, will mix the gangue and fly ash on the ground according to a certain proportion, and put them into gangue silo through large-diameter drilling, and convey them to working face through belt and reversed loader, and then fill them into worked-out section through suspension conveyor at filling bracket rear tail boom. Besides, the bracket is installed with hydraulic tamping mechanism, which can tamp the filling slurry and make them form filling body with design strength, thereby achieving the goal of supporting roof.
 
Technical innovation:
     The filling system has successfully solved two technical problems: vertical and deep direct feeding, dense filling.
     We have developed and produced the filling preparation and conveying equipment specially used for Xingtai Coal Mine.
Application achievement:
After adopting our filling system, more than *0 million tons of industrial square unexploited coal reserves are liberated, the mineshaft life is extended for *0 years, which can obtain the economic benefits of ten billion Yuan. Meanwhile, more than **0 thousand tons of gangue and fly ash can be eliminated each year. The filling control adopts the ground automation and control system. Solid filling mining technology achieves the green mining that there is no subsidence damage or gangue hill on the coal mine ground.