Treatment of spent pot-lining for recovery of fluoride values

Fernandez Lisbona, D and Steel, KM (2007) Treatment of spent pot-lining for recovery of fluoride values. Light Metals, 843-848.

Author Fernandez Lisbona, D
Steel, KM
Title Treatment of spent pot-lining for recovery of fluoride values
Journal name Light Metals   Check publisher's open access policy
ISSN 0147-0809
ISBN 0873396596
Publication date 2007-01-01
Sub-type Article (original research)
Start page 843
End page 848
Total pages 6
Place of publication New York, NY
Publisher American Institute of Mining, Metallurgical, and Petroleum Engineers
Language eng
Subject 0306 Physical Chemistry (incl. Structural)
0912 Materials Engineering
Abstract The leachability of NaF, CaF2 and Na3AlF6 from spent pot-lining (SPL) has been studied with the view to dissolve, manipulate solution equilibria, and precipitate fluoride in a form that can be recycled (directly or indirectly) back into the pot. Leaching results have been combined with theoretical stability constant information to understand solution equilibria and identify novel ways that it can be manipulated to produce AlF3 and/or CaF2, to yield a process with the criteria of minimal process reagents, number of steps, energy and waste. While AlF3 is the preferred form for fluoride, its production in acidic media is difficult owing mainly to the unavoidably high concentrations of Na'. So far, we have found a chemical sequence for recovery of all fluoride as NaAlF4. This is presented along with other sequences being pursued. Following removal of fluoride, high degrees of separation (> 95%) of the remaining refractory compounds from the graphite has proved possible using a density separation technique.
Keyword spent pot-litfing
alummium fluoride
aluminium fluoroaluminates
froth flotation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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Created: Sat, 11 Jul 2009, 02:40:00 EST by Dr Karen Steel on behalf of Faculty Of Engineering, Architecture & Info Tech