Hard coal
01 Common
Coal, fossil coal, is a solid sedimentary rock, a combustible mineral formed by the carbonization of plant residues under pressure and high temperatures without access to oxygen. It is one of the most common minerals in nature and the most widely used by humans. Coal is a valuable fuel and raw material for the metallurgical and chemical industries.
02 Raw material
03 Output material
Coal after grinding:
04 Photo analysis
Magnification ×230
The division price is 10µm
Lignite
01 Common
Lignite is a solid combustible mineral, the lowest member of the carbonization series of fossil coals, hypothetically a transitional form from peat to coal. The color is from light brown to black. Calorific value of combustible mass is 24…31 MJ/kg. It has low hardness and high hygroscopicity.
02 Raw material
03 Output material
Lignite after grinding:
