Abstract
Indian coals, which are of Gondwana origin, contain high ash wherein the extraneous material was intimately mixed in the coal matrix during the formation stage, causing a high level of impurities in the run-of-mine (ROM) material. These coals possess difficult to very difficult washability characteristics. Beneficiation of high-ash noncoking coals of India has become the prerequisite for improving the overall economics and efficiency of power generation. This article describes the washability characteristics of a typical noncoking coal from the Ib Valley Coalfields aiming at 34% ash level in the clean coal as per the stipulations laid by environmental gazette notification of the Government of India. Conventional float-and-sink testing was used to determine the yield of clean coal of 58% at 34% ash content.
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