Freeze-Lining Formation of a Synthetic Lead Slag: Part I. Microstructure Formation

Campforts, M, Jak, E, Blanpain, B and Wollants, P (2009) Freeze-Lining Formation of a Synthetic Lead Slag: Part I. Microstructure Formation. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 40 5: 619-631. doi:10.1007/s11663-009-9256-9


Author Campforts, M
Jak, E
Blanpain, B
Wollants, P
Title Freeze-Lining Formation of a Synthetic Lead Slag: Part I. Microstructure Formation
Journal name METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE   Check publisher's open access policy
ISSN 1073-5615
Publication date 2009-10
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s11663-009-9256-9
Volume 40
Issue 5
Start page 619
End page 631
Total pages 23
Editor Laughlin, D. E.
Place of publication US
Publisher Springer Boston
Collection year 2010
Language eng
Subject C1
091407 Pyrometallurgy
840299 Primary Mining and Extraction of Mineral Resources not elsewhere classified
Abstract Recently, freeze linings have been selected more frequently to protect pyrometallurgical reactor walls, due to a number of advantages over conventional refractory lining such as a self-regenerating capability and the possibility of operating under high-intensity process conditions. A freeze lining is formed on a cooled reactor wall in a time-dependent temperature gradient. To model freeze-lining behavior, input data on several assumptions, such as the phase formation and the temperature at the bath-freeze-lining interface during freeze-lining formation, are needed. In order to provide experimental data, the freeze-lining formation of a synthetic lead slag system (PbO-FeO-Fe2O3-ZnO-CaO-SiO2) is investigated. A lab-scale freeze lining was produced by submerging an air-cooled probe into a liquid slag bath for 120 minutes. The temperature evolution during freeze-lining formation was estimated using the experimentally determined position and composition of the phases, the phase-temperature relations predicted with the thermodynamic computer package FactSage, and the results of reference experiments. For the studied slag system, it is concluded that heat transfer is much faster than mass transfer and crystallization. As a result, the liquid in front of the freeze lining undercools. The degree of undercooling depends on the solidification rate. It is concluded that the temperature at the bath-freeze-lining interface varies between the glass transition and liquidus temperatures of the slag bath during freeze-lining formation.
Keyword INDUSTRIAL NONFERROUS SLAG
ZINC-BEARING RESIDUES
ZINC-BEARING RESIDUES
BLAST-FURNACE HEARTH
HEAT-TRANSFER
MODEL
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Chemical Engineering Publications
 
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Created: Thu, 04 Mar 2010, 15:46:07 EST by Amanda Lee on behalf of School of Chemical Engineering