Previous work showed that manganese ore reduction rates are strongly influenced by the extent of slag phase formation. In this work, the effect of ore composition on slag formation during manganese oxide reduction was predicted using thermochemical calculations; FactSage 6·4 was used to calculate the equilibrium phase relations in the oxide system MnO–SiO2–CaO–MgO–Al2O3. Practically observed differences in ore composition, even within the same orebody, are predicted to cause significant differences in slag formation during reduction, with large differences in ore reducibility expected.
KononovR, OstovskiO and GangulyS. 2009. Carbothermic solid state reduction of manganese ores: 3. Phase development, ISIJ Int., 49, (8), 1115–1122.
7.
KoursarisA, KleynstuberASE and FinnCWP. 1983. A mineralogical investigation of the reduction of Mamatwan manganese ore with carbon, Spec. Publ. Geol. Soc. S. Afr., 7, 375–382.
8.
KoursarisA and SeeJB. 1979. Discussion: reactions in the production of high-carbon ferromanganese from Mamatwan ore, J. S. Afr. Inst. Min. Metall., 79, 306–309.
9.
LiH and MorrisA. 1997. Evaluation of unified interaction parameter model parameters for calculating activities for ferromanganese alloys: Mn-Fe-C, Mn-Fe-Si, Mn-C-Si, and Mn-Fe-C-Si systems, Metall. Mater. Trans. B, 28B, 553–562.
10.
MiyauchiY, MochidaM, and FuchiY. 2001. High thermal electrical property of manganese ore production of high carbon ferromanganese, 236–243. Quebec City, INFACON IX.
11.
OstrovskiO, AnacletoN and GangulyS. 2004. Reduction of Manganese Ores by Methane-Containing Gas, 173–183. Cape Town, INFACON X.
12.
OlsenSE, TangstadM and LindstadT. 2007. Production of Manganese Ferroalloys, Trodheim, Tapir Academic Press.
13.
OstrovskiOI and WebbTJM. 1995. Reduction of siliceous manganese ore by graphite, ISIJ Int., 35, (11), 1331–1339.
14.
PeretyaginVA and PavlovAV. 2003. Aspects of the high-temperature reduction of manganese ores by coal, Metallurgist, 47, (9–10), 419–423.
15.
TangstadM and OlsenSE. 1997. Phase relations in ferromanganese slags during melting and reduction, in Proceedings of the 5th International Conference on Molten Slags, Fluxes and Salts, 549–555, Sydney, ISS.
16.
Van DeventerJSJ. 1987. The effect of gangue components on the reduction of manganosite by graphite: an isothermal kinetic study, Thermochim. Acta, 112, 365–377.
