Extraction of metal from the ore cassiterite involves
Extraction of metal from the ore cassiterite involves
carbon reduction of an oxide ore
self-reduction of a sulphide ore
removal of copper impurity
removal of iron impurity
Solution
The important ore of tin is cassiterite $\left(\mathrm{SnO}_2\right)$. Tin is extracted from cassiterite ore by carbon reduction method in a blast furnace. $\mathrm{SnO}_2+2 \mathrm{C} \rightarrow \mathrm{Sn}+2 \mathrm{CO}$
The product often contain traces of iron which is removed by blowing air through the melt to oxidise to $\mathrm{FeO}$ which then floats to the surface.
$2 \mathrm{Fe}+\mathrm{O}_2 \rightarrow 2 \mathrm{FeO}$