Problem 2: Material balance 

The flue gas in one particular roaster analyses
(volume%).
The ore concentrate analyzes . During roasting  S is removed. The fuel is coal containing 75%C.The ore and flue are separate, but the resulting gases mix

Calculate:

• Amount of roasted product assuming it to contain .
• The cubic meter of flue gases
• Amount of fuel used.
• %excess air used for combustion and roasting.
• Theoretical ratio of air required for roasting to combustion