Molybdenum addition agent and process for its production

Details Molybdenum addition agent and process for its production Molybdenum addition agent and process for its production

1987-11-25

1988-07-19

Rosenberg, Peter D.

Alloys or metallic compositions

Ferrous

Processes

75 05B, 75 05BB, 75 53, 420123, C22C 3300

Patent

active

047584068

ABSTRACT:
Molybdenite is roasted under controlled conditions to provide a polymolybdenum oxide composition having an oxygen content in excess of the stoichiometric oxygen content for MoO.sub.2 and less than that for MoO.sub.3, such that the composition contains MoO.sub.3 equivalent in excess of 5% and ranging up to 15% by weight, preferably, from about 10% to 15% by weight. The polymolybdenum oxide composition can be used to introduce molybdenum into baths of molten steel and the like with high recovery of the molybdenum content in the bath and with quiet addition characteristics as compared to the use of MoO.sub.3 per se. Preferably, a Herreshoff type roaster is used and the production rate of the furnace producing the new product is substantially increased, with an exit gas richer in SO.sub.2, as compared to use of the same roaster in roasting molybdenite to form MoO.sub.3 per se.

REFERENCES:
patent: 3053614 (1962-09-01), Foos
patent: 4011073 (1977-03-01), Powers
patent: 4595412 (1986-06-01), Brunelli

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