The additive is used to increase combustion efficiency of low-caloric ultra-anthracite and lean coal.

Ri Chun Hui began making its research from 20 years ago as a college teacher, true to the will of President Kim Il Sung and general secretary Kim Jong Il to make up for the fuel shortage with low-caloric coal.

Existing additives are chemical reagents with high costs. She tried to invent a new kind with low costs on the basis of locally available raw materials. Faced with many difficulties, she never ceased the research.

Finally, she succeeded in inventing a new kind of additive capable of sharply raising caloric value, with easy make-up method.

The additive-added lean coal is applied to forging and heat treatment, too.