Answered: A solid ore containing 82 wt% FeS2 and…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

A solid ore containing 82 wt% FeS2 and 18 wt% inert is fed to a furnace. Dry
air is fed in 40% excess of the amount theoretically required to oxidize all of
the sulfur in the ore to SO3 . A pyrite conversion of 85% is obtained, with 40%
of FeS2 converted to form sulfur dioxide and the rest forming sulfur trioxide.
Two streams leave the roaster: a gas stream containing SO3 , SO2 , O2 , and N2
, and a solid stream containing unconverted pyrite, ferric oxide (Fe2 O3 ), and
inert. Using 100 kg/min of ore as a basis, calculate the rate of Fe2O3 production
(kg/min) in the outlet solid stream, and the total molar flow and composition of
the outlet gas stream. The following reactions take place in the furnace:
FeS2 ( s ) + 15/2 O2 ( g ) → Fe2 O3 ( s ) + 4 SO3 ( g )
2FeS2 ( s ) + 11/2 O2 ( g ) → Fe2 O3 ( s ) + 4 SO3 ( g

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