Coal Beneficiation - Application of Froth Flotation

I shall try to highlight the growth of beneficiation in
coal and leading to the need for adoption of flotation circuits. Beginning in early 50's when the upper horizon with low ash and low near gravity materials were mined, all either jigging or heavy media baths for beneficiation was found effective. The fines were taken out before the feed into the cleaning circuit. The fines were of low ash and were invariably remixed. Circuits were simple and operated well.