Process for recovering valuable metal from waste catalyst

Details Process for recovering valuable metal from waste catalyst Process for recovering valuable metal from waste catalyst

1994-06-29

1995-07-11

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

4231502, 4236585, 423144, 423114, 423 56, 423 58, 423 63, 423 68, 423132, 502 24, B01D 1100, C01G 3900, C01G 3100, C22B 2300

Patent

active

054318920

ABSTRACT:
A process for recovering valuable metals from a waste catalyst based on an alumina carrier includes (a) roasting the waste catalyst at a temperature range of 400.degree. to 1,000.degree. C. to obtain a roasted product; (b) preparing a reduction dissolution by dissolving the roasted product with sulfuric acid in the presence of a metal as a dissolution catalyst; (c) separating a large part of the aluminum from the reduction dissolution solution and recovering aluminum as ammonium aluminum sulfate from the solution, optionally after subjecting the reduction dissolution solution to a treatment of removing iron; (d) extracting molybdenum as a molybdate by solvent extraction from the solution after separating and recovering aluminum from the solution; (e) extracting vanadium as a vanadate by solvent extraction from the solution obtained as a residue after extracting molybdenum; and (f) recovering nickel and cobalt each as a hydroxide from the extraction residue after recovering vanadium.

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