Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Abstract

Coal-fired power plant fly ash is a global environmental concern due to its small particle size, heavy metal content, and increased emissions. Although widely used in concrete, geopolymer, and fly ash brick production, a large amount of fly ash remains in storage sites or is used in landfills due to inadequate raw material quality, resulting in a waste of a recoverable resource. Therefore, the ongoing need is to develop new methods for recycling fly ash. The present review differentiates the physiochemical properties of fly ash from two coal combustion processes: fluidized bed combustion and pulverized coal combustion. It then discusses applications that can consume fly ash without strict chemical requirements, focusing on firing-associated methods. Finally, the challenges and opportunities of fly ash recycling are discussed.

The Implementation of a Binary Blend of Waste Glass Powder and Coal Bottom Ash as a Partial Cement Replacement toward More Sustainable Mortar Production

“…Coal bottom ash is a dark grey material that contains angular particles of varied shapes. Coal bottom ash is wastage of coal combustion in a thermal plant at 1400-1500 • C, which creates bottom ash of varied sizes that may be classified as fine or coarse particles in high-strength concrete [36]. According to a recent study, replacing fine aggregate with CBA can lower tensile strength by up to 30%, whereas cement additives can boost compressive strength.…”