Title:
Harvesting of Fly Ash - Sustainable Value and Benefits
Author(s):
Fedorka
Publication:
Web Session
Volume:
ws_S25_Fedorka.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/30/2025
Abstract:
“The positive economic and technical benefits of utilizing coal ash as a replacement for cement in concrete has an extensive and successful history. However, the availability of coal ash for use as a supplementary cementitious material (SCM) in concrete has decreased dramatically. Harvested CCR from legacy disposal and storage sites has proven to be a valued source of material. The SEFA Group has been beneficiating harvested coal ash on a commercial scale since 2015, and to date has processed more than 5 million tons of recovered CCR. In addition to creating a high-quality SCM for the concrete products industry, beneficiating harvested CCR provides a manufactured product that is available on a consistent basis. In an effort to maximize volumes recycled, while maintaining consistent product quality, a successful harvesting and beneficiation program incorporates a number of steps that are customized to the material properties of available CCRs. These steps include, but may not be limited to, drying, classifying, grinding and carbon treatment. This paper will discuss SEFA's experience in harvesting and processing CCR for encapsulated beneficial use, as well as the common beneficiation techniques employed at commercial scale.” Objectives: 1. Understand the economic and technical benefits of using ash in concrete as a replacement for Portland cement. 2. Explain the impacts on the environment from a Sustainability perspective. 3. Understand the difference between byproduct / production coal ash and recycled / harvested ash. 4. Provide an overview of beneficiation steps required to process harvested coal ash to meet relevant industry specifications.