Coal preparation method
Selected from the coal using the difference in specific gravity of coal and gangue, the sorting method in water or a dense medium (heavy liquid, heavy suspensions) and air (dry) medium are: re-medium is selected, jigging, grooves election, Shaker selection and centrifugal force field selection (see re-election, friction and bounce selection).
Flotation
The separation between the physical and chemical properties of the surface between coal and vermiculite is used, usually foam flotation and multi-oil flotation (oil group coal preparation).
magnetic separation
Use of certain impurities having magnetic characteristics, magnetic separation can be used to remove harmful impurities, such as high gradient magnetic separator remove the monomer reached the isolated disseminated pyrite (see magnetic separation).
Elective selection
Utilizing the difference in electrical conductivity or dielectric constant between coal and impurities, the harmful impurities are removed, for example, ultra-low ash clean coal is obtained by electric selection (see electrification).
In the coal preparation, the application of heavy medium selection and jigging or the combination of the two is the most used. In order to improve the sorting accuracy of fine-grain coal, centrifugal force field coal preparation (heavy medium cyclone, water medium cyclone) and electromagnetic damper screen lower gas chamber coal jig coal mining development is rapid; shaker The selection is only applicable to the selection and recovery of pyrite from fine-grained grade (6-0.15mm). The dry-type method is only suitable for high-cold, arid and water-deficient areas; the sorting method has poor sorting effect. Generally not used, but in the simple recovery of coal in the meteorite or the gangue pile, there are also tank washing machines with different structures. For the selection of slime (-0.5mm size), flotation is currently the best sorting method. Foam flotation is generally used. Multi-oil flotation (oil group coal preparation) only changes coal to liquid fuel. (Can be used instead of direct combustion of oil , now used in the United States, Italy and other countries) or when the recovery of very fine coal particles can not be effective with any other sorting method. The magnetic separation method is applied as a means of recovering the weighting agent in the heavy medium coal preparation plant; as a method of removing impurities, as in the electric separation method, it is in the research stage.
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