The Influence of Dissolved Metals in Cryolitic Melts on Hall

The Influence of Dissolved Metals in Cryolitic Melts on Hall Cell Current Inefficiency
R.D. Peterson and X. Wang

Results from a laboratory stud of dissolved metals (including aluminum, sodium, and lithiumf in cryolitic melts were coupled with the Lillebuen equation for Hall Cell current inefficiency to make predictions for industrial cells. The effects of bath chemistry and operational parameters, such as bath temperature, were considered over a reasonable operating range. Examination of both constant cell temperature and constant cell superheat (the difference between operating temperature and bath freezing point) was made for varying bath compositions. Results showed that decreasing cryolite ratio increased current efficiency under both conditions, but maintaining a constant superheat resulted in a greater increase in current efficiency. Increasing LiF concentration in the electrolyte did not increase current efficiency when the bath temperature remained constant, but did cause a considerable increase when a constant superheat was maintained.

This paper is the recipient of the 1992 Light Metals Award

Publisher: TMS
Product Format: PDF
Pages: 331-337
Date Published: February 1, 1991
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