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Alumina Crusting and Dissolution in Molten Electrolyte

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Summary

The effect of alumina’s physical properties on crusting and dissolution in molten bath was investigated in bench scale tests. These tests showed an improvement in crusting with increased loss-on-ignition (LOI)

LOI is a laboratory procedure of measured weight loss from 300°–1000°C. levels. The improved crusting was largely attributed to the low levels of a alumina in the high LOI ore. An increase in the fines content to 30% −325 mesh did not affect crusting or dissolution. Above that level, crusting diminished and the dissolution rate increased. The dissolution rates of poor crusting aluminas are higher than those of aluminas which form a hard crust. This is due to the intimate contact between individual alumina particles and the bath. A 30-minute film, produced by Kaiser Aluminum, “Alumina Crusting and Dissolution,” presents the phenomena described in this report.

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Authors
  1. A. R. Johnson
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Additional information

A. Roger Johnson, Section Head, Process Development, Kaiser Aluminum & Chemical Corporation, Reduction Research Department, 23333 Stevens Creek Boulevard, Cupertino, California 95014.

Dr. Johnson received his BS from the University of California, Davis and PhD from Stanford University, both in chemical engineering. He has worked for Kaiser Aluminum's Reduction Research Department for eight years, and previously was involved with work in the areas of heat and mass transfer operations in reduction cells, automatic control, alumina properties, and environmental control.

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Johnson, A.R. Alumina Crusting and Dissolution in Molten Electrolyte. JOM 34, 63–68 (1982). https://doi.org/10.1007/BF03339133

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  • DOI: https://doi.org/10.1007/BF03339133

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