Recovery of sodium fluoride and other chemicals from spent carbo

Details Recovery of sodium fluoride and other chemicals from spent carbo Recovery of sodium fluoride and other chemicals from spent carbo

1975-10-02

1978-09-12

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423129, 423184, C01F 704

Patent

active

041138317

ABSTRACT:
Floride and aluminum values, as well as carbon, are recovered from waste cathode liner material from aluminum electrolytic cells by leaching of the liner at ambient temperature with a caustic solution, followed by precipitation of sodium fluoride by saturating the leach liquor with a compound which suppresses the solubility of sodium fluoride in the leach liquor. Ammonia is a preferred compound. Aluminum compounds, as well as the carbon values, are also recovered. Treating chemicals used in the process are recycled. The process is essentially a closed-cycle process with substantially no discharge of effluent.

REFERENCES:
patent: 0691470 (1902-01-01), Jordan
patent: 0941799 (1909-11-01), McCulloch
patent: 1871723 (1932-08-01), Morrow
patent: 2714053 (1955-07-01), Albert et al.
patent: 2732283 (1956-01-01), Clukey
patent: 3000702 (1961-09-01), Cunningham
patent: 3106448 (1963-10-01), Whicher et al.
Sienko et al., Chemistry, Second Edition, McGraw-Hill Book Co., Inc., (1961), pp. 344-346.

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