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The main physical and physical and chemical properties of coal
TIME:2016-9-30 11:46:55 | VIEW:
Introduction to the physical and physical and chemical properties of coal design in many aspects, such as the spatial structure properties (surface properties, porosity and pore size distribution), thermal properties. Optical properties and electrical properties.
1, the wettability of coal
The wettability of coal is a capability of coal to adsorb liquid. When the surface of coal particles in contact with the liquid, such as the role of coal molecules is greater than the force between the liquid molecules, the solid coal can be wet, the coal surface can adhere to the liquid, otherwise not wetting. Coal, on the whole, is mostly lipophilic and hydrophobic, easily wetted by the surface. Only lignite due to high oxygen content, there are more polar oxygen-containing functional groups, it is obvious hydrophilic, easily water wetting. The wettability and pore volume of coal have a great influence on the quality of slurry. Lignite and some low-rank bituminous coal due to hydrophilic significantly and pore volume up to pay can not be made in line with the requirements of the high concentration of coal-water slurry.
2, coal grindability
In many processes, coal is first pulverized and pulverized into very fine pulverized coal, so the grindability of coal is a very important index of use, which refers to the degree of difficulty of coal being broken into pulverized coal . Usually in a mine produced by the fragile coal as a standard coal sample, the grindingability index is set to be measured coal samples in accordance with the provisions of the provisions of comparison, measured a relative index. The larger the index, the easier said to be crushed. Coal grindability is mainly related to coal, and other coal composition, mineral content and species also have an impact.
3, the specific surface area of coal
The coal is a porous substance having a specific surface including an outer surface area and an inner surface area in two parts. The so-called specific surface area of coal refers to the total surface area of coal per unit mass. The specific surface area of coal is mainly the internal surface area, the proportion of external surface area is small. The size of the surface of coal is important not only for understanding the formation process of coal and the microstructure of coal, but also for the adsorption of coal, high vacuum thermal decomposition, gas phase oxidation and so on. Therefore, it is one of the important physical properties. With the change of the degree of coalification, the specific surface area of coal has a certain change. Ie, coal with a low degree of coalification and coal with a coalification degree has a specific surface area of less than a medium surface area.
4, brittleness
Coal brittleness is also called brittleness, which characterizes the crushing strength of coal. Brittleness of large coal, the lump of coal crushing probability, will produce more of the pulverized coal. Determination of brittleness of coal crushing strength method and compressive strength method. The brittleness of coal is related to the composition of coal and coal and the extent of coalification. Usually in the fat coal and coke brittleness of the largest degree of coal to the lean coal, lean lean coal, lean coal and anthracite direction increased, the coal brittleness in order to reduce the above order. When the degree of coalification to the gas coal, weakly caking coal, long flame coal to reduce the direction, the brittleness is gradually reduced.
5, the density of coal
Since coal is a loose structure with cracks in the solid, so the density of coal should take into account the volume of cracks, pores and other effects, which makes the concept of density diversification, there are real density, apparent density and bulk density of the points.
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