Production of finely-divided particulate bismuth oxide

Details Production of finely-divided particulate bismuth oxide Production of finely-divided particulate bismuth oxide

1985-12-05

1987-06-23

Doll, John

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01B 2700

Patent

active

046751718

ABSTRACT:
Finely-divided particulate bismuth oxide is produced by the steps of heating bismuth at 800.degree. C. or above in a first compartment of a sealed vessel divided into two compartments by a partition wall, the two compartments communicating with each other by a hole provided on the partition wall, feeding an inert gas such as nitrogen and argon into the first compartment so that the bismuth vapor formed by heating bismuth has a bismuth concentration of 0.1 to 0.5 g/liter, blowing air into the bismuth vapor introduced from the first compartment into the second compartment through the hole on the partition wall, permitting the air to mix with the bismuth vapor to form bismuth oxide and simultaneously cooling the thus formed bismuth oxide to 250.degree. to 300.degree. C., discharging by suction the bismuth oxide from the sealed vessel at a flow rate of 1 to 5 m/sec, and cooling the discharged bismuth oxide by supplying cooling air outside the sealed vessel.

REFERENCES:
patent: 1300522 (1919-04-01), Vollkommer
patent: 1318336 (1919-10-01), Ellis
patent: 1425918 (1922-08-01), Thomson
patent: 2177551 (1939-10-01), Perkins et al.
patent: 3306760 (1967-02-01), Zirngibl et al.
patent: 3467498 (1969-09-01), Benner et al.
patent: 3525595 (1970-08-01), Zirngibl et al.

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