Process for recovering molybdenum values from spent catalysts

Details Process for recovering molybdenum values from spent catalysts Process for recovering molybdenum values from spent catalysts

1977-02-03

1978-02-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 53, 423 61, 423606, 423593, 75121, C01G 3900

Patent

active

040752780

ABSTRACT:
A process of recovering molybdenum from waste products and particularly from spent catalyst based on active alumina and containing molybdenum compounds comprising mixing the spent catalyst with sodium carbonate powder, adding water and remixing to absorb the water in the catalyst particles, baking the mixture to convert the molybdenum present to sodium molybdate, treating the mixture at ambient temperature with carbon dioxide gas, treating the resultant mixture with hot water to dissolve the sodium molybdate, neutralizing and clarifying with concentrated nitric acid, and precipitating to produce molybdic acid high in purity that is suitable for the production of molybdenum compounds as well as for the recovery of the pure metal.

REFERENCES:
patent: 1293404 (1919-02-01), Giles et al.
patent: 1948407 (1934-02-01), Watts
patent: 2367506 (1945-01-01), Kissock
patent: 2949339 (1960-08-01), Marvin
patent: 3622301 (1971-11-01), Mehl et al.
patent: 3773890 (1973-11-01), Fox et al.

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