Reduction Kinetics of Iron Ore-Graphite Composite Pellets

Golap Mohammad Chowdhury

ISBN 10: 384335782X / ISBN 13: 9783843357821

Published by LAP LAMBERT Academic Publishing Nov 2010, 2010

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Neuware -The rate of reduction of iron ore-graphite composite pellets under inert and reducing atmospheres has been investigated in a tailor made thermo-gravimetric packed-bed reactor. A very low overall apparent activation energy estimated from experimental data indicates that the reduction is not chemical kinetics controlled. A kinetic model has been developed to quantify the temporal evolution of different iron oxide phases and metallic iron. The rate-dependent parameters (frequency factors and activation energy) have been estimated from experimental data by applying an optimization tool (Genetic Algorithm). The predicted phases at various degrees of reduction were verified by X-ray diffraction and metallographic investigation. A simplified thermal model has also been developed to show the role of heat transfer on the kinetics of the reduction process under inert atmosphere. The reduction kinetics of the composite pellets in the packed bed under reactive atmosphere is not heat transfer controlled and might possibly be controlled by CO-gas mass transfer through the pellets.Books on Demand GmbH, Überseering 33, 22297 Hamburg 112 pp. Englisch. Seller Inventory # 9783843357821

Bibliographic Details

Title: Reduction Kinetics of Iron Ore-Graphite ...

Publisher: LAP LAMBERT Academic Publishing Nov 2010

Publication Date: 2010

Binding: Taschenbuch

Condition: Neu

About this title

Synopsis:

The rate of reduction of iron ore-graphite composite pellets under inert and reducing atmospheres has been investigated in a tailor made thermo-gravimetric packed-bed reactor. A very low overall apparent activation energy estimated from experimental data indicates that the reduction is not chemical kinetics controlled. A kinetic model has been developed to quantify the temporal evolution of different iron oxide phases and metallic iron. The rate-dependent parameters (frequency factors and activation energy) have been estimated from experimental data by applying an optimization tool (Genetic Algorithm). The predicted phases at various degrees of reduction were verified by X-ray diffraction and metallographic investigation. A simplified thermal model has also been developed to show the role of heat transfer on the kinetics of the reduction process under inert atmosphere. The reduction kinetics of the composite pellets in the packed bed under reactive atmosphere is not heat transfer controlled and might possibly be controlled by CO-gas mass transfer through the pellets.

About the Authors:

Dr. Golap Mohammad Chowdhury; Deputy Manager, Iron & Sinter, Research & Develpoment Centre for Iron & Steel,SAIL,Ranchi,India. Dr. Gour Gopal Roy; Professor, Dept. of Metallurical & Materials Engg., IIT, Kharagpur, India. Dr. Sanat Kumar Roy; Professor & HoD, Dept. of Metallurical & Materials Engg., IIT, Kharagpur, India.

Dr. Golap Mohammad Chowdhury; Deputy Manager, Iron & Sinter, Research & Develpoment Centre for Iron & Steel,SAIL,Ranchi,India. Dr. Gour Gopal Roy; Professor, Dept. of Metallurical & Materials Engg., IIT, Kharagpur, India. Dr. Sanat Kumar Roy; Professor & HoD, Dept. of Metallurical & Materials Engg., IIT, Kharagpur, India.

Dr. Golap Mohammad Chowdhury; Deputy Manager, Iron & Sinter, Research & Develpoment Centre for Iron & Steel,SAIL,Ranchi,India. Dr. Gour Gopal Roy; Professor, Dept. of Metallurical & Materials Engg., IIT, Kharagpur, India. Dr. Sanat Kumar Roy; Professor & HoD, Dept. of Metallurical & Materials Engg., IIT, Kharagpur, India.