Liu, Guijian; Yang, Pengyue; Peng, Zicheng; Wang, Guiliang - In: Energy 28 (2003) 10, pp. 969-978
The basic chemical composition of coal and ash is an important but insufficient characteristic for the reliable explanation of coal properties. The modes of occurrence of the elements, their origin and concentration in coal, as well as their behavior during the coalification process, are also...