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32 MetallurgyLandscape

32 MetallurgyLandscape - Isolation of the Elements From...

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CHEM112 LRSVDS Metallurgy 1 What can you expect for most metals? Isolation of the Elements From their Natural state Sources of : Which metals can be found in nature in elemental form? (How do you know?) CHEM112 LRSVDS Metallurgy 2 Most metals are found in minerals. 1) Some are found in Elemental Form Ag, Au, Pt, Ru, Rh, Os, Ir (noble metals) 2) Aluminosilicates and Silicates Metal + Al, Si, O e.g. Beryl = Be 3 Al 2 Si 6 O 18 Hard to extract the metals 3) Nonsilicate Minerals Oxides – Al 2 O 3 , TiO 2 , Fe 2 O 3 Sulfides – PbS, ZnS, CuFeS 2 Carbonates – CaCO 3 4) Salts Active Metals – Group I, II Not found in nature as pure metals, always combined with other elements (e.g. salts in the ocean, minerals); WHY? Modern Materials: Metals and Alloys
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CHEM112 LRSVDS Metallurgy 3 Steps in Metallurgy 1) Mining getting the ore out of the ground 2) Concentrating the ore: prepare for further treatment Floatation Hindered settling Magnetic separation 3) Further purification and reduction to obtain the metal in its elementary
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32 MetallurgyLandscape - Isolation of the Elements From...

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