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The information presented constitutes the report for the period July 1 to September 30, 1996. Characterization of intraparticle mass transport limitations during pyrite oxidation was embarked upon. The effort was intended to confirm that intraparticle transport limitations are negligible. Samples of 20 micron pyrite particles extracted from the flow reactor after oxidation at 1550 K in 1% oxygen level were analyzed. The samples has been extracted after reaction times of 42 ms, 52 ms, 77 ms, and 146 ms. For these samples, the bulk product compositions previously determined by X-ray diffraction analysis consisted of varying proportions of FeS{sub 2}, Fe{sub 1-X}S, FeO, and Fe{sub 3}O{sub 4}. The particles were analyzed to determine if the iron compounds previously identified by bulk X- ray diffraction analysis (XRD) were well mixed within individual particles. The extracted pyrite particles, epoxied and sectioned, were subjected to a variety of analytical techniques using the microprobe (JEOL 733 Superprobe). Secondary electron and backscatter electron imaging was performed. Iron, sulfur, and oxygen elemental X-ray maps were generated. Energy dispersive spectrometry was used for qualitative elemental analysis of selected particles. These particles were subsequently subjected to qualitative elemental analysis by wavelength dispersive spectrometry (WDS) using Fe{sub 2}O{sub 3} and FeS{sub 2} as standards. During WDS analysis, micron-radius hemispherical volumes bisected by sectioning plane were sampled. The microprobe analyses of oxidized pyrite showed that, generally, particles could be modeled as well-stirred, having negligible compositional gradients of the scale of the particle radius. In all four samples of pyrite analyzed, there were particle edge effects. Furthermore, there were finger-like projections of different phases in mixed-phase particles. Nevertheless, compositional gradients were of concern only in the 77 ms samples

Mechanisms of pyrite oxidation to non-slagging species. Quarterly report, July 1, 1996--September 30, 1996