lignite

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

褐煤是从15到35米深的露矿开采的。

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煤矿层等伴。

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.

将云南先锋褐煤采用热模拟的实验方法一组成熟度不同的煤,并将煤中的干酪根用于对菲的吸附研究。