Investigation of freeze linings in copper containing slag systems

Mehrjardi, Ata Fallah, Hayes, Peter and Jak, Evgueni (2012). Investigation of freeze linings in copper containing slag systems. In: Proceedings of the Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12). Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12), Beijing, China, (). 27-30 May 2012.

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Name Description MIMEType Size Downloads
Author Mehrjardi, Ata Fallah
Hayes, Peter
Jak, Evgueni
Title of paper Investigation of freeze linings in copper containing slag systems
Conference name Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12)
Conference location Beijing, China
Conference dates 27-30 May 2012
Proceedings title Proceedings of the Ninth International Conference on Molten Slags, Fluxes and Salts (MOLTEN12)
Place of Publication Beijing, China
Publisher The Chinese Society for Metals
Publication Year 2012
Sub-type Fully published paper
Total pages 14
Collection year 2013
Language eng
Formatted Abstract/Summary
Slag freeze linings are increasingly used in industrial pyrometallurgical processes to ensure furnace integrity is maintained in aggressive high temperature environments. Most previous studies of freeze linings have analysed the formation of slag deposits based on heat transfer models. The focus of the present research is to determine the impact of chemistry on the microstructures, thickness, stability and heat transfer characteristics of the frozen deposit. The formation of the freeze linings is studied under controlled laboratory conditions using an air-cooled “cold finger” that is immersed into a synthetic slag bath heated in an induction furnace. The temperature profile across the deposit is also been measured.

A Cu-Fe-Si-Al-O slag has been selected for study; the primary phase for the slag has been shown to be delafossite and liquidus temperature of the slag has been determined. The phase assemblages and microstructures of the deposits formed in the cold finger experiments differ significantly from those anticipated from equilibrium cooling of the slag. The freeze lining deposits have been found in general to consist of several different layers. Starting from the cold wall these layers consist of glass; glass with microcrystalline precipitates; multiphase sub-liquidus material containing delafossite and cuprite crystal phase assemblages and high-silica metastable liquid that was separated from the bulk liquid (closed layers); phase assemblages containing delafossite and cuprite crystals and a high-silica liquid phase that is connected to the bulk liquid (open layers), and the outer layer containing a complex mixture of liquid and solid phases. The findings have significant practical implications, and potential for the improved design and operation of industrial
metallurgical furnaces.
Keyword Freeze lining
Copper smelting
Deposit
Copper containing slag system
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Paper W080.

Document type: Conference Paper
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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Created: Thu, 11 Apr 2013, 22:52:44 EST by Professor Evgueni Jak on behalf of School of Chemical Engineering