Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-09-13
1989-03-28
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
423116, 423119, 423126, 423131, 423184, 423185, 423461, 423490, B01D 1302, C01F 750, C01B 3102
Patent
active
048161225
ABSTRACT:
Fluoride-containing wastes, arising in the aluminium industry, particularly spent cell linings from reduction cells, are digested with caustic soda for conversion of sodium cryolite to NaF.
By use of very strong caustic soda NaF may be left in the solid residues after removal of the residual liquor and recovered from such residues by water leaching.
As an alternative weaker caustic soda may be used in the digestion stage and subsequently be crystallised out from the residual liquor, after separation from the solid residues, by evaporating and/or cooling the liquor. The precipitated NaF is then conventiently redissolved in water.
The NaF solution prepared by either route is then preferably subjected to electrodialysis to recover a solution of HF from it. Such HF is conveniently converted to AlF.sub.3 by reaction with alumina.
REFERENCES:
patent: 3106448 (1963-10-01), Whicher et al.
patent: 3787304 (1974-01-01), Chlanda et al.
patent: 4113831 (1978-09-01), Orth, Jr. et al.
patent: 4444740 (1984-04-01), Snodgrass et al.
Alcan International Limited
Niebling John F.
Starsiak Jr. John S.
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