Abstract
Two coals, Beulah (North Dakota) lignite and Elk Creek (West Virginia) high-volatile A bituminous, were burned in both pulverized coal and coal-water slurry fuel forms to study the effect of the modes of occurrence and composition of iron compounds in the coal on the particle size distribution and composition of ash. The slurry preparation process appeared to cause a significant reduction in the particle size distribution of pyrite in the lignite, relative to the pulverized coal. This in turn caused a change in the dominant mechanism of ash formation. In the Beulah pulverized coal, pyrite fragmentation is the major process, forming submicrometer- or micrometer-sized iron oxide particles
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