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Thermodynamics of salt roasting of sulphide ores

Dahlstedt, A and Seetharaman, S and Jacob, KT (1992) Thermodynamics of salt roasting of sulphide ores. In: Scandinavian Journal of Metallurgy, 21 (6). pp. 242-245.

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Thermodynamic analysis of a non-polluting process for the effective treatment of lean multimetallic sulphide ores is presented. The sulphide ore is roasted with sodium chloride in air. Metal sulphides are converted to chlorides that can be separated from the unaffected gangue material. At a temperature of 1100 K the chlorides are present both in gaseous and in condensed states. Volatile chlorides can be easily removed and subsequently condensed. The chlorides present in the condensed state can be leached to separate them from the gangue. The sulphur is trapped as Na2SO4 and thus SO2 emission is minimized. Ellingham diagrams are used to compare data for a large number of elements. The major thermodynamic driving force is provided by the higher stability of Na2SO4 relative to NaCl.

Item Type: Journal Article
Publication: Scandinavian Journal of Metallurgy
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: Thermodynamic analysis;Thermodynamic properties;Sulfide ore; Pyrometallurgy;Ore treatment;Chlorination;Calcining;Metal Sulfides;Sodium Sulfates;Sodium Chlorides;Gibbs free energy Experimental study.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 30 May 2011 05:25
Last Modified: 30 May 2011 05:25
URI: http://eprints.iisc.ac.in/id/eprint/37819

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