The influence of surface roughness on gibbsite scale development on steel

E. Enright; T. Curtin; J. Haines; K. T. Stanton

doi:10.1177/1464420711421269

The influence of surface roughness on gibbsite scale development on steel

E. Enright
, T. Curtin
, J. Haines
, K. T. Stanton

Department of Chemical Sciences

University of Limerick
UC RUSAL
University College Dublin

Research output: Contribution to journal › Article › peer-review

Abstract

Gibbsite scaling on surfaces such as tanks, pipe-work or measuring equipment is the source of many difficulties in the Bayer process. The study presented here investigates the role of surface roughness of steel in aiding gibbsite scale build-up. Steel surfaces of different roughnesses (r_a = 0.01-1.44 μm) were prepared and tested for gibbsite scaling rates in real Bayer process conditions in pregnant liquor in a filtrate tank. The roughness of the steel samples influenced the scale nucleation time and the strength of adhesion of the scale. The smoother the steel sample, the longer it took to form a complete layer of scale and the lower the adhesion strength. Once a complete layer of scale had formed then the rate of scale-on-scale growth was similar for all samples, as expected. The scale growth rate under the conditions tested was found to be an average of 22.63 mm/year.

Original language	English
Pages (from-to)	61-71
Number of pages	11
Journal	Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Volume	226
Issue number	1
DOIs	https://doi.org/10.1177/1464420711421269
Publication status	Published - Jan 2012

Keywords

Bayer process
Gibbsite
Steel
Surface crystallization

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10.1177/1464420711421269

Cite this

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title = "The influence of surface roughness on gibbsite scale development on steel",

abstract = "Gibbsite scaling on surfaces such as tanks, pipe-work or measuring equipment is the source of many difficulties in the Bayer process. The study presented here investigates the role of surface roughness of steel in aiding gibbsite scale build-up. Steel surfaces of different roughnesses (ra = 0.01-1.44 μm) were prepared and tested for gibbsite scaling rates in real Bayer process conditions in pregnant liquor in a filtrate tank. The roughness of the steel samples influenced the scale nucleation time and the strength of adhesion of the scale. The smoother the steel sample, the longer it took to form a complete layer of scale and the lower the adhesion strength. Once a complete layer of scale had formed then the rate of scale-on-scale growth was similar for all samples, as expected. The scale growth rate under the conditions tested was found to be an average of 22.63 mm/year.",

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AU - Enright, E.

AU - Curtin, T.

AU - Haines, J.

AU - Stanton, K. T.

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Y1 - 2012/1

N2 - Gibbsite scaling on surfaces such as tanks, pipe-work or measuring equipment is the source of many difficulties in the Bayer process. The study presented here investigates the role of surface roughness of steel in aiding gibbsite scale build-up. Steel surfaces of different roughnesses (ra = 0.01-1.44 μm) were prepared and tested for gibbsite scaling rates in real Bayer process conditions in pregnant liquor in a filtrate tank. The roughness of the steel samples influenced the scale nucleation time and the strength of adhesion of the scale. The smoother the steel sample, the longer it took to form a complete layer of scale and the lower the adhesion strength. Once a complete layer of scale had formed then the rate of scale-on-scale growth was similar for all samples, as expected. The scale growth rate under the conditions tested was found to be an average of 22.63 mm/year.

AB - Gibbsite scaling on surfaces such as tanks, pipe-work or measuring equipment is the source of many difficulties in the Bayer process. The study presented here investigates the role of surface roughness of steel in aiding gibbsite scale build-up. Steel surfaces of different roughnesses (ra = 0.01-1.44 μm) were prepared and tested for gibbsite scaling rates in real Bayer process conditions in pregnant liquor in a filtrate tank. The roughness of the steel samples influenced the scale nucleation time and the strength of adhesion of the scale. The smoother the steel sample, the longer it took to form a complete layer of scale and the lower the adhesion strength. Once a complete layer of scale had formed then the rate of scale-on-scale growth was similar for all samples, as expected. The scale growth rate under the conditions tested was found to be an average of 22.63 mm/year.

KW - Bayer process

KW - Gibbsite

KW - Steel

KW - Surface crystallization

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JF - Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications

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The influence of surface roughness on gibbsite scale development on steel

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