介绍了煤中低密度轻软杂质清除的工艺过程。

Removing process of light and soft impurity that is medium and low density is introduced.

youdao

据说煤中掺有石子和其它杂质须去掉时，至今仍得把煤在矿上筛过。

To this day coal is said to be screened in the colliery when it has stone and other impurities removed from it.

youdao

乳化液中有大量的漂浮杂质，在立柱缸底和阀腔，留有较多的煤粉、岩粒和铁屑。

A large number of floating impurities in the emulsion, and the valve chamber in the column bottom, left more coal, rock and iron tablets.

youdao