Patent ID: 11898112
Assignee: ASH-TEK, LLC
Field: Environmental technology (Chemistry)
Classification: CPC B  C  F | IPC C

Claim 7:
8. A process for beneficiating landfilled or ponded waste coal fly ash the process comprising:
forming a waste coal fly ash stream having greater than 2% LOI of carbon from waste coal fly ash collected at ambient temperature from a pond or landfill;
subjecting the waste coal fly ash stream to elevated temperatures sufficiently above the ambient temperature to remove at least 75% of the carbon from the waste coal fly ash, the elevated temperature predetermined as a function of at least one of the following characteristics of the collected waste coal fly ash: moisture, LOI, and particle size;
inserting the waste coal fly ash stream into a moisture reduction vessel to form a dried waste coal fly ash, wherein the moisture reduction vessel is selected from the group consisting of a dryer and an aero acoustic machine;
exposing the dried waste coal fly ash stream to an oxygen-rich atmosphere by introduction of additional air, while subjecting the waste coal fly ash stream to the elevated temperature, the oxygen-rich atmosphere predetermined as a function of at least one of the following characteristics of the collected waste coal fly ash: LOI, hydrolysis, and available carbonates; and
performing the steps of subjecting the waste coal fly ash stream to the predetermined elevated temperature and to the predetermined oxygen-rich atmosphere for a processing time predetermined to reduce the LOI of the waste coal fly ash to 2% or less, thereby forming a beneficiated coal fly ash.