Metallurgy.

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Presentation transcript:

Metallurgy

Basic Extraction Procedure Mining Pretreating Magnetic Attraction Cyclone Separation Flotation Leaching Mineral to Compound Pyrometallurgy Hydrometallurgy Compound to Metal Smelting, etc. Electrochemistry Refining Electrorefining Distillation Zone Refining Alloying

Smelting Wool or Smithsonite = Zinc Carbonate Cow Dung Hemimorphite = Zinc Silicate Calamine + Oxygen Zinc Oxide Calamine Zinc Oxide + Carbon Monoxide Zinc

Pyrometallurgy Roasting Calcination … is a thermal treatment that causes chemical reactions between the ore and the furnace atmosphere. Roasting may lead to oxidation or reduction and may be accompanied by calcination. http://iron.wlu.edu/reports/RoastingOre.htm 2 ZnS(s) + 3 O2(g) 2 ZnO(s) + 2 SO2(g) 2 MoS2(s) + 7 O2(g) 2 MoO3(s) + 4 SO2(g) Calcination … is the heating of an ore to bring about its decomposition and the elimination of a volatile product. PbCO3(s) PbO(s) + CO2(g)

Smelting … is a melting process in which the materials formed in the course of chemical reactions separate into two or more layers. Smelting often involves a roasting stage in the same furnace. Two of the important types of layers formed in smelters are molten metal and slag. The molten metal may consist almost entirely of a single metal, or it may be a solution of two or more metals. Slag consists mainly of molten silicate minerals, with aluminates, phosphates, fluorides, and other ionic compounds as constituents. ZnO(s) + CO(g) Zn(s) + CO2(g)