Method and apparatus for the recovery of molybdenum from...

Details Method and apparatus for the recovery of molybdenum from... Method and apparatus for the recovery of molybdenum from...

2008-08-20

2010-12-21

Hendrickson, Stuart (Department: 1736)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

C423S606000

Reexamination Certificate

active

07854908

ABSTRACT:
This invention relates to an apparatus and process that utilizes high-temperature oxidation and sublimation techniques for the recovery of molybdenum from spent catalysts or other feedstocks that contain molybdenum. A preferred embodiment uses a counter-rotating vortex reactor and a cyclonic entrained-flow reactor to rapidly heat and oxidize the spent catalyst feedstock, such as carbon, sulfur, and molybdenum compounds, at temperatures in the range of about 2100° F. to 2900° F., resulting in a gas-solid stream containing molybdenum trioxide vapor. A high-temperature cyclone separator is utilized to separate the residue from this stream before this stream is rapidly quenched to a temperature sufficient to effect the condensation of solid molybdenum trioxide without condensing arsenic or phosphoric oxides. The condensed molybdenum trioxide material is separated from this stream by passing through a high-temperature filtration system. The remaining gaseous stream is then ducted to suitable unit operations for possible further material reclamation and entailed pollution control prior to its final discharge to the atmosphere.

REFERENCES:
patent: 4551312 (1985-11-01), Yuill
patent: 4552749 (1985-11-01), McHugh et al.
patent: 6153155 (2000-11-01), Wen et al.
patent: 7202389 (2007-04-01), Brem
patent: 2009/0047198 (2009-02-01), Thomas

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