Beneficiation prospects of baked coking coals from seam XV, Jharia Coalfield, Damodar Valley, India

Abstract

Baked coals in the Jharia Coalfield, due to its irregular physical and chemical characteristics such as hardness, loss in caking property and slow in burning due to loss of volatile matter, have got very poor response from utilization point of view in industry. In this attempt the baked coals from seam XV, lying mostly unused in Jharia coalfield, have been beneficiated through F & S in the laboratories at CIMFR, Dhanbad, India. The washability investigations were carried out at the size fractions 50-25, 25-13, 13-06, 06-03 and 03-0.5 mm and at the specific gravity range of 1.4 to 1.8 at a difference of 0.05 and 0.1. The washability data developed on the size 50-0.5 mm has been presented through conventional washability curve and Mayer’s curve and it is observed that at 11.9% ash level 25.8% cleans may be used for carbon artifact industry and the rejects (74.2%) at 23.7% ash level may be used in Indian Power Plants after judicious blending with high VM power coals.