There are several types of coal
Bituminous concrete is divided into: lean coal, lean coal, lean coal, coking coal, fat coal and 1/3 coking coal, gas coal, gas coal, 1/ 2caking coal and weakly caking coal, non caking coal and long flame coal.Lignite is divided into:Brown coalBrown coal two
Many kindsCoking coal is only one of themAnthracite is divided into:Anthracite oneAnthracite twoAnthracite three
Coal can be divided into anthracite, bituminous coal and ligniteIn our country, the bituminous coal is divided into three parts according to the indexes of ash, volatile matter, caking index and maximum thickness of the colloidal layer
