Based on the UCG(underground coal gasification) theory, the “three zones” which are oxidization zone,reduction zone, and drying zone, were divided; physical a
At present, coal is mainly consumed as fuel. In fact, coal is also a kind of precious raw material in chemical industry on the premise that some harmful mineral
In order to clarify the role of organic matter in the enrichment of base metal, 10 samples of the PermianKupferschiefer from southwestern Poland were analyzed b