Whenever coal is burnt, ash is produced by the thermal transformation of the mineral matter present. Large-scale uses of coal, such as power generation, give rise to significant quantities of ash and a number of uses for this by-product have been developed over time.
During the last two decades a number of changes have occurred in the coal-fired power generation sector that have affected ash production, and trends for the future use of coal are likely to have a continuing impact on ash in respect of quality and quantity. These changes include: the increasingly common practice of . . .