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Coal Combustion Products
Eskom is home to 15 coal-fired power stations which produce ash which is available for utilisation in different applications as long as environmental compliances are met. Ash can be used as a key ingredient for various applications such as cement, tiles, plastic, paint, rubber, bricks and blocks, road construction, brake linings manufacturing and mine backfilling.
Research on ash has yielded a wide spectrum of potential products that a number of companies have protected as their Intellectual Property.
FGD Gypsum

FGD Gypsum is a unique synthetic product derived from flue gas desulfurization (FGD) systems at electric power plants. Sulphur dioxide emission control systems used by coal-fired power plants remove sulphur from combustion gases using "scrubbers." One particular type of scrubber that uses lime or limestone reagent (i.e., a substance used in a chemical reaction to produce another substance) and a forced oxidation (i.e., a chemical combination with oxygen) system produces "FGD gypsum," which is chemically nearly identical to mined natural gypsum and provides a wide-range of environmentally friendly applications.


FGD Gypsum uses

Wall board
Regular, Sheathing and Soffit board

Mining Applications
  • Neutralization or encapsulation of acid-producing materials
  • Barrier to acid mine drainage formation
  • Alkaline amendment to neutralize acid-producing rock
  • Subsidence control in underground mine

  • Acid soil amelioration
  • Sodic soil reclamation
  • Surface crust reduction
  • Runoff and corrosion reduction
  • Fertilizer  

Glass making

Pigments and/or fillers
Legislative requirements Ash Operations​
Before you consider purchasing ash, note that coal ash is classified as hazardous waste under the National Environmental Management Act: Waste Act (NEM:WA). This requires potential users of ash to apply for waste management licenses, supported by an Environmental Impact Assessment or Basic Assessment or Norms and Standards. For further information on the waste management license and the legislative act, contact the Department of Environmental Affairs on to ensure you comply with all regulations.
Key steps to purchasing ash

Eskom Rotek Industries values your interest to purchase our ash product. In order to comply with legislative processes and to promote fairness and transparency, ash is sold on a tender basis. We will gladly meet with you to understand your intentions and expectations for the use of ash, to advise you on purchase requirements and to explore future possibilities with you. 

Topics of discussion will include:
• The type and volume (tons) of ash required.
• The approximate location of the ash and period of time the volume would be needed.
• The intended use of the ash.
• Do you need samples? If required, you could collect samples at the agreed location.
• Transformation objectives with specific focus on local content.
Remember to check the Eskom tender bulletin for any advertised tenders for ash.