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Related Experiment Videos

Advanced ash management technologies for CFBC ash.

E J Anthony1, E E Berry, J Blondin

  • 1CANMET Energy Technology Centre, Natural Resources Canada, 1 Haanel Drive, Ottawa, Ontario, Canada K1A 1M1. banthony@nrcan.gc.ca

Waste Management (New York, N.Y.)
|August 12, 2003
PubMed
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Treating high-calcium coal ash from circulating fluidized bed combustion (CFBC) with CERCHAR hydration or Ash Water Dense Suspensions (AWDS) can mitigate disposal challenges. These methods enable ash utilization in construction materials like concrete.

Area of Science:

  • Environmental Engineering
  • Materials Science
  • Geochemistry

Background:

  • Combustion of high-sulphur coal necessitates effective sulphur emission reduction strategies.
  • Calcium-based sorbents are widely used in sulphur capture, resulting in ashes rich in calcium.
  • Circulating fluidized bed combustion (CFBC) ashes present disposal and utilization challenges due to reactivity, leachate pH, and expansion.

Purpose of the Study:

  • To evaluate the efficacy of two post-combustion ash treatment processes: CERCHAR hydration and Ash Water Dense Suspensions (AWDS) disposal.
  • To investigate the chemical, geotechnical, and utilization potential of treated high-sulphur coal-derived CFBC ash.
  • To assess the solidification and strength development of no-cement concrete made with treated ash.

Main Methods:

Related Experiment Videos

  • CERCHAR hydration treatment applied to high-sulphur coal-derived CFBC ash.
  • Preparation and testing of no-cement and roller-compacted concrete using hydrated and conventionally hydrated ashes.
  • Geochemical examination of solidified mortar paste from no-cement concrete to analyze solidification and strength development.

Main Results:

  • Treated CFBC ashes were successfully used in the production of no-cement concrete and roller-compacted concrete.
  • Ash Water Dense Suspensions (AWDS) were prepared and evaluated as a disposal method.
  • Geochemical analysis provided insights into the chemical processes governing solidification and strength gain in no-cement concrete.

Conclusions:

  • CERCHAR hydration and AWDS disposal show promise in addressing the challenges associated with CFBC ash.
  • Treated CFBC ashes can be effectively utilized as a component in sustainable construction materials, reducing waste.
  • Understanding the geochemical evolution of solidified ash-based materials is crucial for their long-term performance and safe disposal.