Reaction mechanisms and product morphologies on gaseous reduction of metal compounds - extractive metallurgy meets materials science

Hayes, Peter C. (2013). Reaction mechanisms and product morphologies on gaseous reduction of metal compounds - extractive metallurgy meets materials science. In: Tao Jiang, Jiann-Yang Hwang, Phillip J. Mackey, Onuralp Yucel and Guifeng Zhou, 4th International Symposium on High-Temperature Metallurgical Processing: Proceedings. 4th International Symposium on High-Temperature Metallurgical Processing - TMS 2013 Annual Meeting and Exhibition, San Antonio, United States, (77-86). 3-7 March 2013. doi:10.1002/9781118663448.ch10


Author Hayes, Peter C.
Title of paper Reaction mechanisms and product morphologies on gaseous reduction of metal compounds - extractive metallurgy meets materials science
Conference name 4th International Symposium on High-Temperature Metallurgical Processing - TMS 2013 Annual Meeting and Exhibition
Conference location San Antonio, United States
Conference dates 3-7 March 2013
Convener The Minerals, Metals & Materials Society (TMS)
Proceedings title 4th International Symposium on High-Temperature Metallurgical Processing: Proceedings
Journal name TMS Annual Meeting
Series TMS Annual Meeting
Place of Publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Publication Year 2013
Sub-type Fully published paper
DOI 10.1002/9781118663448.ch10
ISBN 9781118605691
9781118663448
Editor Tao Jiang
Jiann-Yang Hwang
Phillip J. Mackey
Onuralp Yucel
Guifeng Zhou
Start page 77
End page 86
Total pages 10
Chapter number 10
Total chapters 85
Collection year 2014
Formatted Abstract/Summary
The high temperature reduction of solids through the use of reactive gas atmospheres has application in a wide range of industrially important processes. Whilst significant advances have been made in understanding and describing these processes, some key aspects of the chemical reactions and reaction mechanisms operating in these systems, for example, the transformation from metal oxide to metal, remain poorly understood. A number of different product morphologies have been identified in these reaction systems and the reaction rates have been shown to be critically dependent on the product structure.

Theoretical examination of the elementary process steps taking place in the region of the gas/metal/metal oxide interface, combined with electron microscope studies of the resultant product microstructures, have enabled the key process and material variables responsible for the development of the various product morphologies to be identified. By considering i) established criteria for the stability of moving interfaces in a thermodynamic potential gradient, ii) the relative rates of chemical reactions on the oxide and metal surfaces, and iii) key process phenomena and physico-chemical properties of the solid phases, the mechanisms and conditions for the formation of various product morphologies are identified. Interestingly the analysis points to direct analogies between these phase transformations and, the phenomena and microstructures observed in metal solidification, and the potential to develop generic models of these fluid/solid
reaction systems.
Subjects 3104 Condensed Matter Physics
2211 Mechanics of Materials
2506 Metals and Alloys
Keyword Compounds
Gaseous reduction
Mechanisms
Oxides
Q-Index Code B1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Part II: Fundamental Research of Metallurgical Process

Document type: Conference Paper
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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