According to the Institute of Chinese ore mine pressure in October 2002, Dr. Xu Jialin research topics in Huaibei Mining Bureau Haizi mine underground goaf backfill, smashing ground gangue, water pumping carrier to backfill areas. I assumed which adjustable row for the sand, water installations. The device can be adjusted at any time according to the pumping requirements for the amount of sand, and stir with the amount of water corresponding with passed under the Road pumping process. The success of the development of the whole subject will and coal goaf backfill has opened a new chapter.
