Bertrand process

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A heavy-fluid coal cleaning process that utilizes a calcium chloride solution as separating medium and is applicable only to deslimed feed. It differs from the Lessing process in that the raw coal is introduced into the system countercurrent fashion, from water to separating solution, the purified coal and the waste being withdrawn in a similarly countercurrent fashion. Coal containing less than 1% ash is said to be obtained by this process. Gaudin, 1

Source: Dictionary of Mining, Mineral, and Related Terms

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