C asinine is the term used for thermal decomposition of solids, e. g CacO3=Cao+ cO2 and is frequently done in rotary kilns. These types of reactions are usually endothermic and fuel must be burnt to sustain them Both roasting and calcining are shrinking core type reactions (see next slide)
Calcining... …..is the term used for thermal decomposition of solids, e.g. CaCO3 = CaO + CO2 and is frequently done in rotary kilns. These types of reactions are usually endothermic and fuel must be burnt to sustain them. Both roasting and calcining are shrinking core type reactions (see next slide)
Morphology of roasting and calcining reactions PbO cao 777 Caco Cao These are idealizations of how reaction proceeds Now to return to the overall scheme of processing oxides and sulfides
Morphology of roasting and calcining reactions. These are idealizations of how reaction proceeds. Now to return to the overall scheme of processing oxides and sulfides
General scheme for processing oxides or fie sulfides of meta of metals with v affinit or。x Oxide concentrate oast in al Smelting to produce form oxid metal and s。。 Reduction with carbon i Impure metal reducing agent urity Metal of required purity
General scheme for processing oxides or sulfides
Reduction is the technology by which oxides are turned into metals The oxides could be naturally occurring or they could be produced by roasting sulfides. The reader gives you much information on the reduction of zinc oxide but this method of producing zinc is becoming obsolete so we will not treat it in class. However, please read section 8.5. 1 on zinc production (as well as the other parts of this chapter) ;it contains some interesting thermodynamics/kinetics The main industrial unit where reduction(of iron oxides to metal) is carried out is
Reduction…. …is the technology by which oxides are turned into metals. The oxides could be naturally occurring or they could be produced by roasting sulfides. The reader gives you much information on the reduction of zinc oxide but this method of producing zinc is becoming obsolete so we will not treat it in class. However, please read section 8.5.1 on zinc production (as well as the other parts of this chapter); it contains some interesting thermodynamics/kinetics. The main industrial unit where reduction (of iron oxides to metal) is carried out is …
The iron blast furnace Ore, coke, limestone Small Cao+cO? Endothermic Fe2O3+Co+Fe3 O4+CO2 Slightly exothermic co…C+C C+co2·2c0 Endothermic Bustle ∫so2+2c→s+20o Mno+C→Mn+C 1650c C+O,·CO Exothermic VI/Slag!I CO2+C→2cO Endothermic
….The iron blast furnace