Problem 1: Material balance

Roasting is a unit process in which sulphide is converted to oxide partially or fully. In production of copper from chalcopyrite, partial roasting is carried out.

In one roasting unit, an ore concentrate of the composition
is roasted using air. The roasting unit is heated by oil of composition 85% C and 15% H, the amount of oil is 5.2% of the weight of the ore. Air for combustion and roasting is  in excess of the theoretical requirement.

The gases from combustion and roasting mix together and are carried through a flue. S passes as . The roasted product consists of .

Calculate:

• Weight of roasted product
• Cubic meter of air (i) 1atm and 273 K and (ii) at 1 atm and 973K
• Amount of  / cubic meter of flue gas.