Extraction of Metals

ROASTING

Sulphides are converted to oxides by roasting in air

ZnS2 + 3O2 = ZnO2 + 2SO2

BLAST FURNACE

Carbon and Carbonmonoxide act as reducing agents

2Fe2O3 + 3C = 4Fe + 3CO2

Fe2O3 + 3CO = 2Fe + 3CO2

EXTRACTION OF TUNGSTEN USING HYDROGEN

WO3 + 3H2 = W + H2O

High temperatures are needed (700) and hydrogen is highly flammable 

EXTRACTION OF Al BY ELECTROLYSIS

Must be molten so an…