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| COURSES DESCRIPTION_METALLURGY & MINERAL PROCESSING |
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Page 18 of 33 MM 441 PYROMETALLURGY Pre-requisite: MM 331, MM 332 Roasting: Thermodynamics and kinetics of roasting. Predominance area diagrams of Me-S-O systems. Selection of roasting parameters: Gas composition and temperature, oxidising roasting, chloridizing roasting. Industrial roasting units: Multiple hearth furnace, sintering machine, fluid-bed roasting, and flash roasting. TORCO process. Reduction: Thermodynamics and kinetics of oxide reduction. Ellingham diagram, Boudouard reaction, reduction of iron oxides in blast furnace, direct and indirect reduction, behaviour of impurities, reduction of other oxidic concentrates and calcines, reduction of oxides of volatile metals, thermodynamic considerations, reduction of zinc in retorts and IS-furnace, zinc fuming, metallothermic and carbothermic reduction of magnesium. Matte smelting: Slags and mattes, thermodynamics of matte-slag separation, magnetite formation in matte smelting units, matte smelting in blast furnaces, reverberatory furnaces, electric furnaces. Flash smelting: Outokumpu and INCO processes. Converting: First and second stages of converting, magnetite formation during converting, copper losses in converter slags, methods of copper recovery from converter slags. Peirce-Smith converter, Hoboken (syphon) converter, and top-blown converter. Refining: Removal of impurities by oxidation or sulphidization, copper fire-refining, lead softening, refining by intermetallic compound precipitation and liquid phase separation (liquation), zone and vacuum refining. Prescribed textbooks: Pehlke, R.D. Unit Processes in Extractive Metallurgy , Elsevier (1973) Gill, C.B.Non-ferrous Extractive Metallurgy , John Wiley and Sons (1980). |
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