The main function of roasting is

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(A) The main function of roasting is to remove volatile impurities from the ore by heating it in a regular supply of air in a furnace at a temperature

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To remove volatile substances

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(A) The main function of roasting is to remove volatile impurities from the ore by heating it in a regular supply of air in a furnace at a temperature below the melting point of the metal. Examples of removal of volatile substances: $S_8 + 8O_2 	o 8SO_2 \uparrow$ $P_4 + 5O_2 	o P_4O_{10} \uparrow$ $4As + 3O_2 	o 2As_2O_3 \uparrow$

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