Kinetics of zinc oxide formation from zinc sulfide by reaction with lime in the presence of water vapor |
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Authors: | H Y Sohn Daesoo Kim |
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Affiliation: | (1) the Department of Metallurgy and Metallurgical Engineering, University of Utah, 84112-1183 Salt Lake City, UT;(2) Present address: the University of Utah, USA;(3) Korea Institute of Energy and Resources, Daejeon, Korea |
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Abstract: | A novel reaction scheme for transforming certain metal sulfides to the corresponding oxides has been developed. In this process,
steam oxidizes the sulfide into the oxide, and the hydrogen sulfide produced reacts with lime to form calcium sulfide and
regenerate steam. There is no net consumption or generation of gaseous species. Thus, the overall reaction can be carried
out in a closed system as far as the gas phase is concerned. This eliminates the possibility of emitting hydrogen sulfide
out of the reactor. Only certain metal sulfides are thermodynamically amenable to this treatment. In this paper, the reaction
of ZnS to ZnO by this scheme is described, together with a detailed formulation of the rate equation for the overall reaction
based on the kinetics of the component gas-solid reactions. Although the present work was done with CaO, other suitable oxides
may be used in its place. A further potential application of this process is to the selective oxidation of certain sulfide(s)
from complex sulfide ores as a treatment prior to the separation of minerals. |
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