Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1977-11-28
1978-09-12
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
204 67, 423111, 423133, 423131, 423240, 423484, 423489, 423179, 423200, C01F 704, C01B 719
Patent
active
041138325
ABSTRACT:
A fully integrated process is provided for the recovery of valuable components from waste materials generated in electrolytic aluminum reduction systems. The waste materials, such as spent pot linings, channel and trench cleanings, floor sweepings and spent alumina from offgas purifying dry scrubbers, are combined, then pyrohydrolyzed at elevated temperature. Fluoridic values, such as NaF and HF can be recovered from the offgas generated by pyrohydrolysis, while alumina and Na.sub.2 O values, or if desired, sodium aluminate, is reclaimed from the solid residue of pyrohydrolysis.
The fluoridic values from the pyrohydrolysis offgas can be used for the manufacture of both electrolytes for aluminum reduction cells and also for the production of anhydrous HF. The alumina from the pyrohydrolysis residue can be reclaimed by a Bayer process-type leach with a caustic solution and the recovered high purity alumina utilized, for example, as reduction cell feed and/or for scrubbing reduction cell offgases. If the solid residue of pyrohydrolysis contains significant amounts of sodium aluminate, this material can either be directly used for dry scrubbing cell offgases, or if desired, utilized for production of high purity alumina. SU
REFERENCES:
patent: 3151934 (1964-10-01), King
patent: 3606176 (1971-09-01), Vodic
patent: 3635408 (1972-01-01), Williams
patent: 3780497 (1973-12-01), Muhlrad
patent: 3907971 (1975-09-01), Bohm et al.
patent: 4006066 (1977-01-01), Sparwald
patent: 4053375 (1977-10-01), Roberts et al.
patent: 4062696 (1977-12-01), Ducote
Andersen John N.
Bell Norman
Lam Hung-Kei H.
Barlay Andrew E.
Calrow Paul E.
Carter Herbert T.
Kaiser Aluminum & Chemical Corporation
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