Microstructural characterization and PH_3 gas evolution analyses were performed on granulated ferrosilicon containing 75wt percent silicon. The results of these analyses were then compared to similar analyses performed on conventionally cast ferrosilicon alloys of similar composition. PH_3 evolution from the granulated alloys was found to be less than 10 percent of measurements on conventional ferrosilicon alloys. The microstructure of the granules differed from that of conventional alloys primarily in the size and distribution of the major phases and the impurity phases. Also of interest was the presence of an oxide layer on the surface of the granules and a compositional variation between individual granules in the 1-2 mm size fraction.
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