New tools for viscosity measurement and modelling of fully liquid and partly crystallised slags

Kondratiev, A., Zhao, B., Raghunath, S., Hayes, P. C. and Jak, E. (2007). New tools for viscosity measurement and modelling of fully liquid and partly crystallised slags. In: Ulrich Waschki, Proceedings of EMC 2007. European Metallurgical Conference (EMC 2007), Dusseldorf, Germany, (953-974). 11-14 June 2007.

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Author Kondratiev, A.
Zhao, B.
Raghunath, S.
Hayes, P. C.
Jak, E.
Title of paper New tools for viscosity measurement and modelling of fully liquid and partly crystallised slags
Conference name European Metallurgical Conference (EMC 2007)
Conference location Dusseldorf, Germany
Conference dates 11-14 June 2007
Proceedings title Proceedings of EMC 2007
Place of Publication Germany
Publisher Die Deutsche Bibliothek
Publication Year 2007
Sub-type Fully published paper
ISBN 978-3-940276-04-9
Editor Ulrich Waschki
Volume 1
Start page 953
End page 974
Total pages 21
Collection year 2008
Language eng
Abstract/Summary As process feedstocks to pyrometallurgical operations become more varied, and complex control over the viscosity, one of the key properties of the slag system, becomes more challenging. To ad-dress this problem new slag viscosity measurement and modelling tools have recently been devel-oped. The viscosity measurements are undertaken using a rotating bob technique; however the design of the apparatus differs significantly from conventional commercially-available instruments. This new design enables i) Control of the gas atmosphere, in particular the oxygen partial pressure of the system. ii) Quenching of the samples at any stage of the viscosity measurements. The new design makes it possible to measure slag viscosities over a wide range of chemical compo-sitions, oxygen partial pressures and temperatures. In addition, it is possible to measure the viscosi-ties of partially crystallised slags, and to directly determine the proportions and chemical composi-tions of the phases present in these slags using electron probe X-ray microanalysis (EPMA). New mathematical models have also been developed enabling the viscosities in complex slag sys-tems to be predicted. The quasi-chemical viscosity model is valid for liquids at all compositions and temperatures within the system Al-Ca-Fe-K-Mg-Na-Si-O under reducing conditions. Used in con-junction with the FactSage program and its associated thermodynamic databases, the viscosities of solid/liquid slurries commonly encountered in industrial slag systems can be predicted. Examples of recent experimental measurements and viscosity predictions relevant to recycling tech-nologies used in non-ferrous metal smelting systems are presented.
Subjects 290702 Mineral Processing
650302 Coal
291301 Process Metallurgy
091407 Pyrometallurgy
Keyword chemical compositions
viscosity measurements
Q-Index Code E1
Q-Index Status Confirmed Code

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Created: Fri, 16 May 2008, 12:16:24 EST by Gail Smith on behalf of Mining and Minerals Process Engineering