ASH COMPOSITIONS RECOVERED FROM COAL COMBUSTION GASES HAVING REDUCED EMISSIONS OF HCI AND/OR MERCURY

摘要

The description relates to production of fly ash with properties suitable for use in Portland cement. The fly ash compositions will contain coal ash, water-insoluble copper compositions and metallic mercury adsorbed onto ash particles. In one aspect, the coal ash composition will have a total mercury content of from 0.1 to 2.0 ppm and the water-soluble mercury is less than 20% of the total mercury content. The process entails combusting coal to produce hot combustion gases containing fly ash, C0₂, chlorine, and mercury, cooling the combustion gases and introducing into the combustion gases at a temperature of less than 1000°F, preferably within the range of from about 250° to about 900°F, a copper-based chloride remediator (CBCR), and collecting the fly ash which comprises insoluble copper compositions and water insoluble mercury compositions.