Cyclic process for recovering metal values and alumina from spen

Details Cyclic process for recovering metal values and alumina from spen Cyclic process for recovering metal values and alumina from spen

1986-05-09

1987-06-02

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423 62, 423 66, 423 68, 423127, 423131, 423140, 423147, 423150, 75101R, 75108, 75119, 75121, 502 25, C01G 3100, C01G 3900

Patent

active

046702296

ABSTRACT:
Metal values and alumina are recovered from spent, usually oily, catalysts by oxygen pressure leaching with sodium hydroxide and/or sodium aluminate to dissolve molybdenum, vanadium and/or tungsten and provide a solid, filterable residue containing alumina and cobalt and/or nickel, the residue is digested with sodium hydroxide to give a sodium aluminate solution and a residue enriched in nickel and/or cobalt, alumina is recovered from the sodium aluminate solution as a solid and the remaining supernatant solution is recycled to the oxygen pressure leaching step wherein the alumina content of the aluminate solution is precipitated and a bleed for metals in the aluminate solution is provided.

REFERENCES:
patent: 3773890 (1973-11-01), Fox et al.
patent: 4145397 (1979-03-01), Toida et al.
patent: 4495157 (1985-01-01), Sebenik et al.

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