Aluminium
Al3+ + 3e- => Al
2O- => O2 + 4e-
Molten aluminium oxide, Cryolite, High temperature+current.
Copper
CuCO3 => CuO + CO2
2Cuo + 2C => 2Cu + 2CO
High temperatures.
Iron
C + O2 => CO2
CO2 + C => 2CO
Fe2O3 + 3CO => 2Fe + 3CO2
Blast furnace, Coke is burnt, produces CO2 (first equation). This is exothermic, causes temperatures of 2000K. The CO2 reacts with more carbon to form carbon monoxide, which acts as a reducing agent to the Iron Oxide.
Tungusten
WO3 + 3H2 => W + 3H2O
High temperatures. Risk: Using hydrogen gas in reaction, very reactive/volatile.
Titanium
TiO2 + 2C + 2Cl2 => TiCl4 + 2CO (1713K)
TiCl4 + 4Na => Ti + 4NaCl (1300K, Inert argon atmosphere.)
Correct me if I'm wrong. (:
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