Chapter 20 Metals Dr. S. M. Condren.

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Presentation transcript:

Chapter 20 Metals Dr. S. M. Condren

Metallurgy the extraction of metals from ores the preparation of metals for use the study of the relationship between structures and properties of metals Dr. S. M. Condren

Metallurgy Pretreatment of Ore Concentration Roasting Dr. S. M. Condren

Pretreatment of Ore crude ore is crushed Dr. S. M. Condren

Concentration floatation Dr. S. M. Condren

Roasting converting sulfide ore to oxide 2ZnS(s) + 3O2(g) -----> 2ZnO(s) + 2SO2(g) 2CuS(s) + 3O2(g) -----> 2CuO(s) + 2SO2(g) 3FeS2(s) + 8O2(g) -----> Fe3O4(s) + 6SO2(g) Dr. S. M. Condren

Manufacture of Iron and Steel Chemistry of blast furnace Chemistry of basic oxygen furnace Dr. S. M. Condren

Chemistry of blast furnace iron reduction raw materials Dr. S. M. Condren

Several Blast Furnaces Dr. S. M. Condren

Liquid Iron Pour Dr. S. M. Condren

Fe(l) & Slag(l) Pours Dr. S. M. Condren

Dr. S. M. Condren

Dr. S. M. Condren

Chemistry of blast furnace raw materials: iron ore limestone or lime coke Dr. S. M. Condren

Chemistry of blast furnace iron ore => source of iron Fe2O3, Fe3O4, FeO, SiO2 Dr. S. M. Condren

Chemistry of blast furnace limestone or lime => flux to remove impurities CaCO3 or CaO Dr. S. M. Condren

Chemistry of blast furnace coke => reducing agent C Dr. S. M. Condren

Chemistry of blast furnace C(s) + O2(g) -----> CO2(g) coke air Dr. S. M. Condren

Chemistry of blast furnace CO2 + C ---> 2 CO coke Dr. S. M. Condren

Chemistry of blast furnace 3 Fe2O3(s) + CO(g) -----> 2Fe3O4(s) + CO2(g) iron ore Dr. S. M. Condren

Chemistry of blast furnace Fe3O4(s) + CO(g) -----> 3FeO(s) + CO2(g) iron ore Dr. S. M. Condren

Chemistry of blast furnace FeO(s) + CO(g) -----> Fe(l) + CO2(g) iron ore pig iron Dr. S. M. Condren

Chemistry of blast furnace CaCO3(s) + heat -----> CaO(s) + CO2(g) limestone lime Dr. S. M. Condren

Chemistry of blast furnace CaO(s) + SiO2(s) -----> CaSiO3(l) lime sand slag Dr. S. M. Condren

Purification of Metals Distillation Electrolysis Chemical Reactions Dr. S. M. Condren

Production of Copper Cu2S(l) + O2(g) -----> 2 Cu(l) + SO2(g) Cu(s) -----> Cu(s) impure electrolysis pure Dr. S. M. Condren

Chemistry of Basic Oxygen Furnace iron purification steel making raw materials Dr. S. M. Condren

Chemistry of Basic Oxygen Furnace raw materials pig iron from blast furnace fluxing agent to remove impuritites alloying agents Dr. S. M. Condren

Dr. S. M. Condren

Chemistry of Basic Oxygen Furnace Removal of excess of carbon C(s) + O2(g) -----> CO2(g) impurity air in pig iron Dr. S. M. Condren

Dr. S. M. Condren

Magnetism 2 main types diamagnetism => all electons are paired paramagnetism => one or more unpaired electron, parallel spins on electrons Dr. S. M. Condren