So the study on coal slack should be enhanced in order to make it become a sort of resources.

When the economy was firing on all cylinders, there was no capacity to spare, but in these slack times China has closed some of its oldest (and most inefficient) coal - and oil-fired power plants.

The innovation and effect analysis of slack coal separation system technology was introduced in Fangezhuang Coal Mine Co. branch, and some questions in the innovation were suggested.