지오폴리머 생산에 사용되는 원료물질로서의 한국의 석탄재

Abstract

The coal ashes were selected for promoting mass consumption of untapped coal ash dumpedin landfills. The bulk chemical composition of coal ashes was determined using XRF. The sum of silica, alumina and iron oxide was around 90% for all coal ashes, which corresponds to Class F fly ash designated in ASTM C 618. The crystalline phases were determined as quartz, mullite, hematite, magnetite, rutile, dehydroxylated pyrophyllite, dehydroxylated muscovite and corundum. Briquette ash showed a wide range from 3.39 to 15.35 of reactive Si:Al ratio due to the crystallite-size parameter dependence of dehydroxylated muscovite and pyrophyllite on the refinement results. The alkali activators were selected on the basis of the reactive Si:Al ratio of each ashes in order to produce geopolymers having Si:Al atomic ratio 2.0 and Na:Al atomic ratio 1.20.coal ashes, which corresponds to Class F fly ash designated in ASTM C 618. The crystalline phases were determined as quartz, mullite, hematite, magnetite, rutile, dehydroxylated pyrophyllite, dehydroxylated muscovite and corundum. Briquette ash showed a wide range from 3.39 to 15.35 of reactive Si:Al ratio due to the crystallite-size parameter dependence of dehydroxylated muscovite and pyrophyllite on the refinement results. The alkali activators were selected on the basis of the reactive Si:Al ratio of each ashes in order to produce geopolymers having Si:Al atomic ratio 2.0 and Na:Al atomic ratio 1.20.