Fly Ash
Fly ash is the byproduct of pulverized coal that has been injected into the burning zone of a boiler. Upon reaching approximately 1500° C (2700°F), the noncombustible inorganic materials in the coal melt and fuse together as tiny molten droplets. These droplets are carried away from the burning zone by the flue gasses and then cool to form spherical glassy particles called fly ash. 1 There ...