lignite

lignite coal is strip-mined at depths of 15 to 35 metres.

褐是从15到35米深露矿开采。

It is the unsolidified sediment consisting of disordered kaolinite and small amount organic matter and lignite materials.

常含少量有机质或与褐矿层等伴生。

In this study a series of different maturation degree coals are yielded by thermally treating a lowgrade lignite, and are used as the sorbents for sorption equilibrium study of phenanthrene.

将云南先锋褐采用热模拟实验方法制得一组成熟度不同,将中干酪根用于对菲吸附研究。