Carbon removal from coal combustion fly-ash by tribo-electrification in vibro-fluidized beds

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Flyash captured from coal combustion flue gases is usually disposed in landfill, creating environmental problems. However, flyash can be potentially used as additives as a feedstock for cement production if the trapped fine carbon particles can be effectively removed in an economical way. The proposed work is to study the feasibility of extracting carbon particles trapped in the combustion flyash by tribo-electrification. Tests will be conducted in a bench scale tribo-electrical fluidized bed unit to investigate the effect of operating parameters, such as the moisture content, carbon content, fluidization velocity and vibration frequency and amplitude on the tribo-charging of flyash powders from coal combustion power plant, and the subsequent separation of charged ash and carbon particles by passing the mixture through a regulated electrical field. In particular, tests using flyash sampled of different properties to be provided by Sonic Technology Solutions Inc. will be performed to evaluate the separation efficiency at different combinations of the particle charge density buildup in the fluidized bed and the electrical field intensity in the separation device. This is part of an integrated effort from the supporting company in extending their sonic grinding technology to achieve high efficiency removal of carbon particles from flyash.