Optimization of Quenching Parameters for the Reduction of Titaniferous Magnetite Ore by Lean Grade Coal Using the Taguchi Method and Its Isothermal Kinetic Study

Optimization of Quenching Parameters for the Reduction of Titaniferous Magnetite Ore by Lean... Optimization of Quenching Parameters for the Reduction of Titaniferous Magnetite Ore by Lean Grade Coal Using the Taguchi Method and Its Isothermal Kinetic Study BITAN KUMAR SARKAR, NIKHIL KUMAR, RAJIB DEY, and GOPES CHANDRA DAS In the present study, a unique method is adopted to achieve higher reducibility of titaniferous magnetite lump ore (TMO). In this method, TMO is initially heated followed by water quenching. The quenching process generates cracks due to thermal shock in the dense TMO lumps, which, in turn, increases the extent of reduction (EOR) using the lean grade coal as a reductant. The optimum combination of parameters found by using Taguchi’s L orthogonal array (OA) (five factors, three levels) is  8 + 4 mm of particle size (PS ), 1423 K of quenching temperature (Qtemp ), 15 minutes of quenching time (Qtime ), 3 times the number of 2 3 quenching {(No. of Q) }, and 120 minutes of reduction time (Rtime ) at fixed reduction 3 3 temperature of 1473 K. At optimized levels of the parameters, 92.39 pct reduction is achieved. Isothermal reduction kinetics of the quenched TMO lumps at the optimized condition reveals mixed controlled mechanisms [initially contracting geometry (CG3) followed http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallurgical and Materials Transactions B Springer Journals

Optimization of Quenching Parameters for the Reduction of Titaniferous Magnetite Ore by Lean Grade Coal Using the Taguchi Method and Its Isothermal Kinetic Study

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Publisher
Springer US
Copyright
Copyright © 2018 by The Minerals, Metals & Materials Society and ASM International
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology
ISSN
1073-5615
eISSN
1543-1916
D.O.I.
10.1007/s11663-018-1283-y
Publisher site
See Article on Publisher Site

Abstract

Optimization of Quenching Parameters for the Reduction of Titaniferous Magnetite Ore by Lean Grade Coal Using the Taguchi Method and Its Isothermal Kinetic Study BITAN KUMAR SARKAR, NIKHIL KUMAR, RAJIB DEY, and GOPES CHANDRA DAS In the present study, a unique method is adopted to achieve higher reducibility of titaniferous magnetite lump ore (TMO). In this method, TMO is initially heated followed by water quenching. The quenching process generates cracks due to thermal shock in the dense TMO lumps, which, in turn, increases the extent of reduction (EOR) using the lean grade coal as a reductant. The optimum combination of parameters found by using Taguchi’s L orthogonal array (OA) (five factors, three levels) is  8 + 4 mm of particle size (PS ), 1423 K of quenching temperature (Qtemp ), 15 minutes of quenching time (Qtime ), 3 times the number of 2 3 quenching {(No. of Q) }, and 120 minutes of reduction time (Rtime ) at fixed reduction 3 3 temperature of 1473 K. At optimized levels of the parameters, 92.39 pct reduction is achieved. Isothermal reduction kinetics of the quenched TMO lumps at the optimized condition reveals mixed controlled mechanisms [initially contracting geometry (CG3) followed

Journal

Metallurgical and Materials Transactions BSpringer Journals

Published: Jun 4, 2018

References

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