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- W2055192359 abstract "Currently, gypsum and pyrite, two major wastes generated by the coal combustion industry, have to be land-filled. The feasibility of a new approach of recovery of lime, iron, and sulfur products from these wastes is discussed in the present work. By thermal decomposition of pyrite, 42% of the sulfur is recovered and pyrrhotite is produced. A thermodynamic analysis shows that the recovery of iron and lime from pyrrhotite and gypsum in a single-stage process is not feasible. Instead, the process has to consist of two subsequent stages. The first is the reduction of pyrrhotite with carbon in the presence of lime to produce iron, calcium sulfide, and carbon monoxide, followed by reaction of calcium sulfide with gypsum to produce lime and a concentrated sulfur dioxide stream. The kinetics of the reactions involved in the two-stage process is studied using thermogravimetric analysis. The reaction rates are favorable above 950 °C and depend on initial reagent concentrations. The effectiveness of magnetic separation of the Fe/CaS mixture is studied. The amount of sulfur in the magnetic fraction depends on the reaction temperature." @default.
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- W2055192359 date "1996-01-01" @default.
- W2055192359 modified "2023-10-15" @default.
- W2055192359 title "Recovery of Lime, Sulfur, and Iron from Gypsum and Pyrite Wastes" @default.
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- W2055192359 doi "https://doi.org/10.1021/ie950383n" @default.
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