The washability characteristics of a coal reserve are provided by obtaining liberation data on the raw coal sample. Liberation refers to the amount of physical breakage required to separate material of different material densities. Low density material is clean coal while high density material is reject rock. Coal washing is accomplished by one of two major processes, by density separation or by froth flotation. Both processes depend on the fact that the particles of which a coal sample are made have different densities.
When water is added to the sample, particles sink to various depths depending on their densities. The various components of the sample can be separated from each other. A number of devices and systems have been developed for extracting the various components of coal once they have been separated with a water treatment.
One of these devices is the jig. The ministry of coal in the note, however, claimed Coal India and its subsidiaries have improved supply considerably in terms of size, quality and extraneous material over the years. This, it said, would considerably reduce wear and tear of all related equipment. In its comment to the note, the coal ministry also said it would be beneficial to use raw coal instead of washed coal.
However, of the 18 coal washeries planned by Coal India under PPP only two have come up after a decade of launching tenders for the same. Sign up. Thank you for subscribing to our newsletter! Connect with us. Coal Washing. Safeopedia Explains Coal Washing. What Does Coal Washing Mean? Safeopedia Explains Coal Washing Coal is a type of sedimentary rock that is formed by buried vegetation that is transformed by pressure and heat over long periods of time.
Share this Term. Related Terms Pollution Atmosphere. Flocculants are chemicals that are used in water treatment processes to improve the settling of small particles. The lamella technology allows utilizing less flocculants in the process, which decreases the impact on the environment. Another key feature is water conservation. With enhanced water conservation, zero outflowing wastewater discharge and lower carbon emissions, the solution contributes to a more sustainable process.
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