MetallurgyHard

Question

Poling process is used for :

Options

A.the removal of Cu2O from Cu   
B.the removal of Al2O3 from Al
C.the removal of Fe2O3 from Fe
D.all of these

Solution

Impure copper is remelted in a reverberatory furnace lined with SiO2 and a blast of O2 is blows into the furnace. O2 oxidises S, Sb and As to their respective oxides which being volatile get volatilised and are thus removed. Fe is oxidised to FeO which forms a slag of FeSiO3 with SiO2 lining of the furnace. Molten copper left behind contains CuO as impurity. This molten copper is treated with powdered anthracite and then stirred with a pole of green wood. Green wood at high temperature, liberates hydrocarbon gases which are converted into methane (CH4). Methane thus obtained reduces CuO to free Cu-metal, which is about 99.5% pure and is called tough pitch copper.
                Green wood → Hydrocarbons → CH4
                4CuO + CH4 → 4Cu (pure metal) + CO2 + 2H2O.

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