Pyrometallurgy (Leaving Cert Engineering): Flashcards
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Pyrometallurgy definition
Pyrometallurgy definition
High-temperature processes to extract metals from ores
Gangue
Gangue
Unwanted materials separated from metals
Typical pyrometallurgy temp range
Typical pyrometallurgy temp range
500-2000°C
Autogenous process
Autogenous process
Process sustained by exothermic reactions alone
Four main pyrometallurgical processes
Four main pyrometallurgical processes
Calcining, Roasting, Smelting, Refining (CRSR)
Calcining
Calcining
Thermal decomposition by heating, drives off volatiles
Roasting
Roasting
Oxidation of metal sulfides at high temps (gas-solid)
Dead roasting
Dead roasting
Complete oxidation of sulfide with excess oxygen
Partial roasting
Partial roasting
Incomplete oxidation with limited oxygen
Smelting
Smelting
Reduction of metal oxides using carbon, produces molten metal
Reducing agents in smelting
Reducing agents in smelting
Coke or charcoal (carbon sources)
Refining in pyrometallurgy
Refining in pyrometallurgy
Removes impurities through thermal processes
Metals extracted by pyrometallurgy
Metals extracted by pyrometallurgy
Iron, copper, zinc, chromium, tin, manganese
Pyrometallurgy reaction rate advantage
Pyrometallurgy reaction rate advantage
High temps accelerate reactions dramatically