The raw coal produced in the mining

The raw coal produced in the mining area is not a pure substance, but a mixture of many substances, the main components of which are coal and gangue. Among them, gangue contains argillaceous, pyrite, gypsum and other minerals. At the same time, the density of coal and gangue is not the same. The density of coal is 1200kg / m-1700kg / m, while the density of gangue is higher than that of coal, usually 1800 kg / m-2600kg / m. Therefore, we can use the different density of the two to separate the coal and gangue. Generally speaking, the coal with a density of 1400KG / m-1500kg / M is called clean coal; the coal with a density between 1400KG / M and 1800kg / M is called medium coal, and the coal with a density greater than 1800kg / M is called gangue. The process of heavy medium coal preparation is to put the mixture of different densities into the liquid with the density between the two times. If the density is lower than the medium, it will float on the liquid surface. If the density is higher than the medium, it will sink into the bottom of the medium. Then, the mechanical means or liquid flow will be used to discharge the light and heavy products respectively, and the coal separation is completed. This is heavy medium coal preparation.