Characteristics and cleanliness class of coal seam in Shulan Street mining area

In order to efficiently and cleanly use the coal in Shulan Street mining area,the coal quality was analyzed based on the general geology,characteristics of coal-bearing strata and physico-chemical property.The type,industrial properties and usage of coal were determined according to the proximate analysis.The rank of coal cleanliness in this mining area was drew primarily from the aspects of ash and sulfur content on the basis of 6 grades of coal cleanliness class proposed for new coal resource potential evaluation. The results show that durain is the main lithotypes in as-mined coal,and huminite is the main maceral. The coal in this mining area is mainly long flame coal with medium-high ash,extremely low sulfur,extremely high volatile and low calorific value. The cleanliness rank of raw coal is Ⅵ,which belongs to low clean coal.The cleanliness rank of clean coal is Ⅲ which belongs to higher clean coal. After washing,coal possessed lower calorific value,higher tar yield,higher ST and FT,and its cleanliness are increased significantly.It thus can be used as steam coal,gasification coal and even coking coal with greater economic value.