Fly ash is a by product of power generation in coal fired power stations. Within a power station, coal is fed to a series of mills that pulverise the coal to a very fine powder. This powder is then fed into a boiler which combusts the coal to produce heat, that is then used to produce steam required for power generation. During the coal combustion process, minerals in the coal fuse to form glassy alumino silicate spheres. These spheres remain in suspension within the flue gas from the boiler and are ultimately collected downstream by either electrostatic or mechanical precipitation.
At its various operating sites, Fly ash Australia selectively collects fly ash and subject to rigorous testing, further refines these collected materials to produce quality fly ash products meeting the needs of our customers.
The picture below explains the process of producing fly ash at a power station.