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- W211221473 abstract "Oxidation of pyrite alone and pyrite embedded in coal by leaching with hot solutions of sodium carbonate containing dissolved oxygen under pressure produces hematite, the major solid reaction product. The hematite is deposited as a concentric rim surrounding the core of unreacted pyrite. The thickness of the rim is greater for products obtained after longer leaching time or under conditions of higher oxygen partial pressure. The product is identified as hematite by X-ray diffraction analysis. Data from scanning electron microscopy, and energy-dispersive X-ray analysis show that under these conditions of desulfurization, phase transformations occur (from pyrite to hematite). In addition, great differences in porosity of the two zones (core and rim) are observed. The nature and extent of these transformations are discussed in terms of the desulfurization potential of pyrite in coal. (10 refs.)" @default.
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- W211221473 date "1980-01-01" @default.
- W211221473 modified "2023-09-27" @default.
- W211221473 title "Characterization of solid reaction products from wet oxidation of pyrite in coal using alkaline solutions" @default.
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