Solution :

This problem gives elemental analysis in terms of Cu, and S of ore concentrate

All  of ore concentrate will enter into roast product

Sulphur balance gives amount of S reacting with  and

Similarly  balance gives to FeS and  to

Amount of roast product =775kg (a)Answer

To calculate sum of flue gas one has to do sulphur balance.

Let x kg moles is flue gas

S in feed = S in flue gases + S in roast product.

X = 3102.7m3 (1atm, 273k)(b) Ans.

Amount of fuel can be determined by  and is 44.32 kg (c) Ans.

Excess air in

balance determines actual air = 140.28 kg moles.

Theoretical air (for combustion and roasting) = 79.27 kg mols.
Excess air =77% (d) Ans.

 (e)Ans.