7. The roasting of pyrites analyzing 85% FeS2 and 15% gangue utilizes 40% excess air (FeS2 to SO2 )supplied at the rate of 358 m³ /hr at 23°C , 743 mm Hg and 88% RH. A partial analysis of the cinder...

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Extracted text: 7. The roasting of pyrites analyzing 85% FeS2 and 15% gangue utilizes 40% excess air (FeS2 to SO2 )supplied at the rate of 358 m³ /hr at 23°C , 743 mm Hg and 88% RH. A partial analysis of the cinder showed 25.92% FeS2 and17.83% gangue. Only 65% of the FeS, gasified is converted to SO, and the rest to SO3 . Calculate the following per kg pyrite used: a) Complete analysis of the burner gas (5.4% SO2,8.6% O2 80.5% N2 , 2.9% SO3 and 2.6% H2O ) b) Weight of 15% Oleum formed from 85% H2SO4, If all the SO, reacts in the converter (1.72)