公开(公告)号：US20200095864A1

公开(公告)日：2020-03-26

申请号：US16090060

申请日：2017-12-04

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Xiaoxing ZHONG ,  Feng WANG ,  Chen XIA ,  Botao QIN

IPC: E21F5/06 ,  C09K21/02 ,  C09K21/06

Abstract: Disclosed is a physical-chemical composite inhibitor for controlling spontaneous combustion of low-rank coal, and methods of preparing and using the same. The composite inhibitor consists of a chelate and attapulgite, the chelate is generated by chelation of proanthocyanidin with calcium chloride. The composite inhibitor has moisture-absorbing and moisture-retaining effect, and can reduce water dissipation at low temperature. A stable oxide insulating layer such as MgO and Al2O3 insulating layer can be formed at high temperature, which can block a coal body from contacting with oxygen. In addition, the composite inhibitor can capture hydroxyl free radicals generated during the chain-cycle reaction and destroy peroxide free radicals, and can also interact with an active moiety in coal to form a stable structure such as ether linkage and hydrogen bonding, thereby achieving permanent inhibition of low-rank coal.