Cleaning and liquid contact with solids – Processes – Work handled in bulk or groups
Patent
1984-02-28
1986-03-18
Caroff, Marc L.
Cleaning and liquid contact with solids
Processes
Work handled in bulk or groups
134 255, 134 28, 134 29, 134 30, 423111, B08B 308, B08B 704
Patent
active
045766517
ABSTRACT:
A process for treating fluoride-contaminated scrap lining material from electrolytic reduction cells comprises mixing the material with 7-30 parts of sulphuric acid and sufficient water to bring liquid content to 60-80 parts per 100 parts of lining material, mixing in sufficient lime to at least neutralize the sulphuric acid and make the slurry slightly alkaline, the slurry then being allowed to set into a solid mass.
The slurry should be of a paste-like consistency. The lime may be wholly calcium hydroxide, but a substantial proportion may be in the form of calcium carbonate.
The scrap, before or after the above treatment with lime and sulphuric acid, is preferably heated to 150.degree.-500.degree. C. in the presence of water vapor to destroy cyanides.
REFERENCES:
patent: 4113832 (1978-09-01), Bell et al.
patent: 4158701 (1979-06-01), Andersen et al.
patent: 4160808 (1979-07-01), Andersen et al.
patent: 4160809 (1979-07-01), Andersen et al.
patent: 4444740 (1984-04-01), Snodgrass et al.
Light Metals, 1981, "Recovery of Fluoride and Fluorine Balance of Aluminum Smelting Plant", Mizuno et al., pp. 407-419.
Alcan International Limited
Caroff Marc L.
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