Pyrites analyzing 81% FeS2 and 19% gangue is burned in excess air to produce a burner gas with an Orsat analysis of 5.84% SO2, 9.72% 02 and 84.44% N2. Analysis of the cinder shows 8.29% unburned FeS2...

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Basis: 100 kmols of burner gas (BG)

Extracted text: Pyrites analyzing 81% FeS2 and 19% gangue is burned in excess air to produce a burner gas with an Orsat analysis of 5.84% SO2, 9.72% 02 and 84.44% N2. Analysis of the cinder shows 8.29% unburned FeS2 and 3.81% SO3. The gases from the burner are cooled and made to come into contact with Milk of Lime in an absorption tower. The dolomitic lime used is 82% CaO, 16% MgO and 2% inerts. The bisulfite liquor produced contains 7.05% total SO2 of which 1.15% is “free" and the rest 5.9% being present as bisulfites. An analysis of the dry waste gas shows that it contains only O2 and N2. Assuming no further oxidation of SO2 to SO3 and formation of H2SO4 in the tower.


Extracted text: kg of bisulfite liquor/kg of pyrite * 10.0345 kg of water for slaking/kmol of BG 7.9012 3.1661 35.2181 4.4954 5.3834 kg of SO3 in cinder/kmol of BG * 0.1997 0.0715 kg of pyrites/kmol of BG * 0.2746 6.710 0.0520 8.6829 9.2285 kg of lime/kmol of BG * O 6.3131 3.7732 O 2.6543 O 2.5204