UTILIZATION OF COAL-BURNING POWER PLANT BY-PRODUCTS

摘要

An aqueous slurry is formed from modified fly ash, i.e., a mixture of alkaline earth sulfates or sulfites, unreacted alkaline earth oxides and fly ash from coal-burning power plant ash collection devices. The slurry, which may contain suitable modifiers, is carbonated with CO2-containing gases, e.g., power plant stack gases, and the resulting carbonates are separated by flotation methods. The separated carbonates are dewatered and dried and may then be reinjected above the combustion zone of the furnace or mixed with the coal to be burned.