This presentation discusses cleaning coal using an air cyclone. It was presented by three students under the guidance of S.R. Yadav. The objectives are to study coal characteristics and preparation methods, and to reduce ash content in coal using an air cyclone. The document describes the history of coal use, types and composition of coal, common impurities, and conventional preparation methods. It outlines the materials and experimental procedure used to test the air cyclone, including variables changed and data collection. Results are displayed in graphs and conclusions are made about optimal settings for maximum coal recovery. The work was conducted in laboratories at P.V.P.I.T. with an approximate expenditure of Rs. 45,000.