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Thermodynamics of oxide-sulphide equilibria for chromium, vanadium and titanium
Luleå tekniska universitet.
1991 (English)In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 20, no 6, p. 331-340Article in journal (Refereed) Published
Abstract [en]

The equilibrium between oxides and sulphides of chromium, vanadium, and titanium was studied at 1000-1400°C by means of a H2-H2S-H2O gas mixture according to the reaction: MeOy + x H2S + (y - x) H2 = MeSx + y H2O, where Me denotes one of the three metals. Measurements were made in the range of log (H2S/H2) between about -2 and -1. Of the three oxides, chromium oxide is sulphided most easily and titanium oxide least easily. The stoichiometric coefficients x and y were derived from the (H2S/H2) and (H2O/H2) ratios and their interrelation. The results were combined with known Gibbs energy data for MeOy, H2S and H2O to give ΔGxο for the reaction: Me + (x/2) S2 = MeSx. The stability of the sulphides relative to the elements increases in the sequence chromium to titanium. Results were combined with literature data for the sulphur potentials in the solid solution range MeSx to give ΔGxο as function of x. For each of the three metals ΔGxο decreases with increasing x value to a minimum where the S2 potential reaches 1 atm. This minimum occurs at about 59 atom % S for chromium, about 60 atom % S for vanadium and about 62 atom % S for titanium

Place, publisher, year, edition, pages
1991. Vol. 20, no 6, p. 331-340
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-8233Local ID: 6b593540-2cc9-11dd-9c9b-000ea68e967bOAI: oai:DiVA.org:ltu-8233DiVA, id: diva2:981124
Note

Godkänd; 1991; 20080528 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-05Bibliographically approved

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Pei, Benyan
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CiteExportLink to record
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