Fly ash  Beneficiation
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  • Fly ash is the finely divided mineral residue resulting from the combustion of powdered coal in electric generating plants. It is also called pulverized fuel ash. Fly ash consists of inorganic, incombustible matter present in the coal that has been fused during combustion into a glassy, amorphous structure.
  • The implementation of technologies in order to comply with the Clean Air Act has led to the deterioration in quality of fly ash
  • ASTM specification provides both chemical and
    physical requirements that fly ash must meet before it is allowed to be used in concrete, the largest market area for Coal Combustion Products
  • The Loss on Ignition (LOI) of flyash is an important quality when considering utilization. The LOI is primarily due to the presence of unburned carbon. The standard specifications for the use of flyash as a mineral admixture in Portland cement concrete are given in ASTM C618-89a. which sets an LOI limit of 6%; however, many states have set a more stringent limit of 3%.
  • Carbon levels in fly ash impact the ability to entrain air in concrete.
  • There are several emerging technologies that upon implementation will result in a Utilities compliance with required emission standards but will not require subsequent beneficiation
  • In order to regain a market for high LOI flyash, an effective means of removing carbon must be developed. Air classification is one process that has shown significant potential

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