Question

90% of pyrite conversion was achieved with 50% of FeS2 converted to form sulfur dioxide while the rest forming sulfur trioxide. 100 kg/hr of ore was roasted with 200% theoretical air. The solid waste stream contained the unconverted pyrite, ferric oxide, and inert. The gas stream exits the furnace is cooled from 1000°C to 545°C at a constant absolute pressure of 35.0 atm in a waste-heat boiler. Determine the composition of the gas stream, the mass ratio of the solid stream and the volumetric flow rates of the gas stream entering and leaving the waste heat boiler.

Answer 1

the pfe Setnog — Peg 03 +48 07 - © pfe goz hogy — 4505 + fezas Presa + iş = 4503 + fexos ® Pyrite a 100 kg Chr. Moles of pynte ore a 55.85764 2189.85 2 Now . la A 093437 kmol = 0234,4 mol hr. Now 901 conversion takes place out of which rot will go for soa 4 50% will go for SO3 Productions , so moles of pyrite got unconverteds 83u:ux. 2013.44 mol mole of pyrite reacted a 700.96 mole of sa formed from) mol of peş, zamol so soa formed form by 375 molig resa = 450.96 mol and similarly from reaction ® moles of so3 formedo 750, 96moles, Moles of fea Os formed from rea" 18774 in u n "reen @ 1024.74. Scanned with CamScanner

Calculation for oa. for roasting of Imole of feasa 1 h mole ojos - required. so now for 834.4 mole of fesa 2294.6 moles of te g required But we have 2001. air which meane 4589.2 moles, go moles of N2 = 17264.133 moles of N2. Now moles of Og reacted a too in reaction + 2010 Oz inrraction ☺ > 37640X n +34546XE = 516.205+704.025 = 1220.31 molestiae non Now moles of a unreacted a 1074.2 a moles.. Here; solid was a stream, contain fericoxide and inert. unconveted pyrite, Gas Stream contain SO2 SO3 402. Potal mole mole of gas stream= 750.96+700.96 et to 1074. Pamor ssit? 2576.21 moles, cਕ 7.0 341.7) CamScanner ਮੈਂ s 9911 ILI Yo sod? 29.15.1. 7.504F 29.15 mass of solid Stream = 03.44x119.95 +375,48X159.7 +17264.133X14 2 311.662 Kg/nr. 7. Mass radio o feoi = tarft. 19.884.. fesa ? 3.21-4. 3 77.564. Given (1) for volumetric How rates. VanRt 11 - 1000 V fese = 183432 X 8.314x 1273 = 2.49 m/hr (at incet) - 35x101.325 pa 3 sath Vanir 2 10.926.67 x 8.514X. 1273 = 32604.3m Mhr atinus) 32.61myhr. volumetric flowrate at exil gas stream P22545c. Wapiok Veo, ' 7 *87.314 x 0110 1 44 = 144m2 nr stir 35.8101,325 1.44 Vsona que ha x 8.3ux si a ti tems/hr 35x101.325 roku 0.751 18 22.06 mhr 21.074 X 0.314 x 818 Scanned with 35 X 101.325 CamScanners