公开(公告)号：US20200318480A1

公开(公告)日：2020-10-08

申请号：US16763426

申请日：2019-02-22

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Nan ZHOU ,  Hengfeng LIU ,  Meng LI ,  Zhongya WU ,  Jixiong ZHANG

IPC: E21D15/48 ,  E21D13/00 ,  E21D15/00 ,  E21F15/02 ,  E21C41/18 ,  G01B21/08

Abstract: A method of recovering a room-and-pillar coal pillar by using external replacement supports. In the recovery of a room-and-pillar coal pillar, a cement material wall is formed by performing pouring around a coal pillar having a width to height ratio of less than 0.6, by means of a single-pillar sack arrangement technique, such that a coal pillar resource may be mined while a wall made from a cement filling material supports an overlying stratum. After mining is complete, a coal pillar goaf region is filled with the cement filling material, and after the cement filling material solidifies and is stable, the single pillar can be recovered.

公开(公告)号：US20200378256A1

公开(公告)日：2020-12-03

申请号：US16632543

申请日：2019-04-01

Applicant: China University of Mining and Technology ,  XUZHOU ZHONGKUANG BACKFILLING & MINING TECHNOLOGY CO., LTD.

Inventor： Jixiong ZHANG ,  Wenyue QI ,  Qiang ZHANG ,  Kai SUN ,  Nan ZHOU ,  Hengfeng LIU

IPC: E21C41/18 ,  E21F13/06 ,  E21F15/06

Abstract: The present invention discloses a mine exploitation, separation, filling and treatment exploitation method, including main sources of gangue on a small-volume gangue exploitation working face and gangue reducing measures; system layout, equipment and separation technology for coal gangue separation; system layout, equipment and production technology for filling synergistic caving type coal efficient stoping; pretreatment and pre-control measures for environmental influence before and after gangue filling; and design principle and design steps of the mine “exploitation, separation, filling and treatment” exploitation method. The method not only solves the problem of long-distance transportation of gangue, reduces the lifting cost of underground gangue and relieves the pressure of mine auxiliary lifting and ground coal washing plants, but also may effectively treat coal mine gangue, reduce the surface stacking area of coal gangue, reduce the damage to the ecological environment of a mine and protect an ecological environment. Furthermore, a gangue filling and coal efficient stope face has high single production efficiency, may meet the requirements of modern mines for production capacity, and application prospects are wide.