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Alumina scale composition and growth rate in distribution pipes

Alumina scale composition and growth rate in distribution pipes

Category
Journal publication
Abstract
Scaling in distribution pipes for secondary alumina is a major issue in aluminium smelters. The scale is formed inside the distribution pipes, and gradually reduces the cross section that is available for alumina transport. The scale cannot be removed without dismantling the transport pipes and using chemical and/or mechanical treatments. This leads to interruptions in normal operation, requires additional labour, and a stock of additional pipe sections. To get a better understanding of the scale formation mechanisms, the rate of scale growth was monitored by acoustic measurements in a transport pipe section at an aluminium producing plant over a period of several months. Correlation between growth rate, and recorded parameters from the associated pots, fume treatment system and meteorological data were studied. In addition, samples from the actual scale were examined by SEM, TEM and AFM to investigate the microstructure and chemical composition.
Client
  • Norges forskningsråd / 247789
  • NORTEM / 197405
Language
English
Author(s)
Affiliation
  • University of South-Eastern Norway
  • SINTEF Industry / Process Technology
  • SINTEF Industry / Metal Production and Processing
  • SINTEF Industry / Materials and Nanotechnology
  • SINTEF Industry / Sustainable Energy Technology
Year
2019
Published in
The Minerals, Metals & Materials Series
ISSN
2367-1181
Page(s)
697 - 706