Canadian Metallurgical Quarterly · 2002 · 36 citations · 5 references
EngineeringChemical EngineeringMining EngineeringMetallurgyMineral ProcessingReaction EngineeringExtractive MetallurgyFerrous MetallurgyMetallurgical KineticsMine Waste ManagementOre MineralogyOre ProcessingBlast Furnace TechnologyInterfacial Area ConcentrationManganese KineticsManganese ReductionsManganese ResourcesMineral Dissolution KineticsOre ReductionReduction Kinetics
This paper analyzes the results of MnO reduction from manganese ore and ferromanganese slag obtained at NTNU (Trondheim) and UNSW (Sydney). Manganese ore upon melting consists of two phases: solid MnO phase which may be a pure MnO oxide or a MnO-MgO solid solution and liquid slag. The process of manganese ore reduction includes MnO phase dissolution into the molten slag and MnO reduction from the slag. It is suggested that the reduction rate of MnO is controlled by the intrinsic kinetic step. The proposed kinetic model takes into account changes in the interfacial area and manganese oxide activity in the slag in the course of reduction. The kinetic model is used to examine effects of temperature, ore composition, CO partial pressure, coke size and reaction time on the extent of MnO reduction. Kinetic constraints in electric furnace and blast furnace ferromanganese making are also discussed.
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