What is the standard of coal
Characteristics of mineral raw materials(1) physical properties of coalThe physical property of coal is the external manifestation of certain chemical composition and molecular structure of coal. It is determined by the factors such as the original material and its accumulation conditions, the conversion process, the degree of coalification and the degree of wind and oxidation. Including color, gloss, pink, specific gravity and bulk density, hardness, brittleness, fracture and conductivity, etc.. Among them, in addition to the specific gravity and conductivity need to be measured in the laboratory, the other can be determined according to the naked eye observation. The physical properties of coal can be used as the basis for the preliminary evaluation of coal quality, and it is used to study the cause of formation and metamorphism of coal.
PinkRefers to the coal pulverized coal in color or with glazed porcelain carved when traces, so called streak color. Light brown black. The higher the degree of coalification, the deeper the pink.
glossRefers to the reflection of the surface of coal under ordinary light. Asphalt, glass and diamond luster. The higher the degree of coalification, the stronger the luster; the more mineral content, the darker the luster; the deeper the wind and oxidation, the darker the luster, until completely disappear.
colourRefers to the natural color of the surface of fresh coal, coal is the result of different wavelengths of light absorption. Brown - black, generally with the increase of the degree of coalification and gradually deepened.
