The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 2026
Filed:
Jan. 18, 2025
Taiyuan University of Technology, Taiyuan, CN;
Jun Guo, Taiyuan, CN;
Xiaoze Wen, Taiyuan, CN;
Guorui Feng, Taiyuan, CN;
Jinwen Bai, Taiyuan, CN;
Ruipeng Qian, Taiyuan, CN;
Xu Zhang, Taiyuan, CN;
Jiahao Zhang, Taiyuan, CN;
Quan Liu, Taiyuan, CN;
Zilong Zhang, Taiyuan, CN;
Xueyao Wu, Taiyuan, CN;
Taiyuan University of Technology, Taiyuan City, CN;
Abstract
A method for recovery of residual coal pillars by freezing accumulated water in room-and-pillar mining areas is provided. A feasibility of repeated mining of residual coal pillars in room-and-pillar goafs is distinguished based on production data and exploration data of a mine. An accumulated water in the room-and-pillar mining areas is frozen to replace a paste filling material, which envelopes collapse roofs and gangues in the room-and-pillar goaf as a whole. The room-and-pillar goaf is filled with a frozen ice body. Roadways and mining faces are arranged in the frozen ice body. Coal cutter cuts the residual coal pillars and the frozen ice body. With the advancing of the mining face, the residual coal pillars are gradually recovered and melted water after the cutting is pumped out.