- The results shown that there are some good rules for the characterization of freeradicals of coals in coalification.
- The relationship between the properties of coals with different coalification degree and quality of their briquets were investigated.
- "Many technical problems were solved with relation to low degree of coalification,low ash fusion temperature and low ash content.
- The plasma temperature differs from one kind to another, the higher the coalification degree is, the higher the plasma temperature will be.
- Plutonic coalification is the leadiny factor in coalification in south Sichuan. This paper focuses attention on the effect of geological structure on distribution of coal type.
- Moreover the geochemistry of trace elements in coal could be used to explain the coalification,and some elements as special marker could be used to compare the coal beds.