Separation Technologies (ST) has commissioned its first industrial scale plant engineered to reclaim fly ash from coal ash impoundment basins. A pilot facility at the Talen Energy Brunner Island Steam Electric Station in York Haven, Pa. combines the Titan America LLC subsidiary’s new proprietary drying and screening system with longstanding electrostatic separation equipment for removing unburned carbon from coal ash. The processes and technologies, debuting in tandem, yield ProAsh, ST’s established ASTM C618 concrete-grade fly ash product; and EcoTherm, an improved material with fuel value plus chemistry suitable for cement production.
Separation Technologies’ reclaiming process at the Talen Energy Brunner Island station entails screening (above) and drying (below) impounded ash, then conveying to an electrostatic separator (bottom) for grading ProAsh Class F fly ash and EcoTherm. The latter can serve as an economical alternative to bauxite and other silicon dioxide, aluminum oxide and iron oxide sources needed to augment ground limestone in cement kiln raw feed.