Ball Milling of Class-F Indian Fly Ash Obtained from a Thermal Power Station

Akshata G. Patil; S. Anandhan
Fly ash (FA) is a waste material produced by combustion of coal. Large quantities of FA have been generated worldwide from thermal power stations. Many routes have been tried for the safe disposal of FA. In an effort to add value to FA, a class-F FA that has been generated by a thermal power station was subjected to high energy ball milling. Ball milling was carried out for a total duration of 60 hrs and samples were taken out at regular intervals for characterizing various properties of the ball milled FA. Crystallite size and particle size of the ball milled FA were determined by X-ray diffraction and dynamic laser scattering, respectively. The shape and texture were studied using SEM and TEM. IR Spectroscopy revealed that the smooth and inert surface of the FA was converted to a rough and more reactive one by ball milling. It was found that after 60 hrs of milling, crystallite size of quartz phase present in the FA was reduced from 37.58 nm to 9.25 nm and the average particle size got reduced from 94.35 μm to 0.70 μm.
Fly Ash; High Energy Ball Milling; Nanomaterial; Waste; Electron Microscopy
Download | Back to Issue| Archive