Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1988-02-16
1989-01-17
Cintins, Ivars
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
210688, 210720, 210724, 210913, 423 54, 423 92, 423122, 423131, 423140, C01G 3700
Patent
active
047987081
ABSTRACT:
A process is disclosed for recovering metals from chromium bearing material comprising one or more or the metals of cobalt, nickel, molybdenum, tungsten, iron, tin, aluminum. The process comprises atomizing the material to produce a flowable powder which is then fused in an oxidizing atmosphere with sufficient alkali metal hydroxide at a temperature sufficient to form a nonmagnetic fused material in which the chromium, tungsten and molybdenum are present as water soluble salts. The resulting fused material is then slurried with a sufficient amount of water to dissolve the water soluble compounds. The pH is adjusted to from about 9.2 to about 9.6 with an acid to allow insolubles to form which contain any cobalt, and nickel and the major portion of any iron, tin and aluminum followed by separating the insolubles from the resulting first liquor. The pH of the first liquor is adjusted to 0 to 2 with an acid and methyl alcohol is then added to it in an amount sufficient to reduce the chromium to the trivalent state. Activated carbon is then added in an amount sufficient to form a carbon-containing suspension wherein essentially all of any tungsten and molybdenum contained therein are adsorbed by the carbon, followed by separating the carbon-tungsten-molybdenum from the resulting second liquor, the pH of which is adjusted to about 5.0 to 8.5 with a base to form a precipitate containing essentially all of the chromium, followed by separating this precipitate from the resulting spent liquor.
REFERENCES:
patent: 4207295 (1980-06-01), Kagetsu et al.
patent: 4298581 (1981-11-01), Douglas et al.
patent: 4305754 (1981-12-01), Rappas et al.
patent: 4668483 (1987-05-01), Ladd et al.
Ladd Judith A.
Miller Michael J.
Castle Donald R.
Cintins Ivars
GTE Products Corporation
Quatrini L. Rita
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