Method for purifying leady oxides

Details Method for purifying leady oxides Method for purifying leady oxides

1999-08-02

2000-11-28

Griffin, Steven P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

423619, 241 241, C22B 1300, C01G 2106

Patent

active

061531561

ABSTRACT:
A process for providing a leady oxide having reduced levels of undesired metallic impurities such as, for example, bismuth and/or silver, comprises roasting the leady oxide to convert part to orthorhombic PbO, exposing the roasted leady oxide to particle size reduction so that the tetragonal PbO can be separated from the orthorhombic PbO fraction, and recovering the orthorhombic fraction having the reduced level of impurities.

REFERENCES:
patent: 4269811 (1981-05-01), Striffler, Jr. et al.
patent: 5173277 (1992-12-01), Montgomery et al.
patent: 5540915 (1996-07-01), Yasuda et al.
patent: 5660600 (1997-08-01), Vyas
Boher et al., Journal Of Solid State Chemistry 55, pp. 245-248, 1984.

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