Process for removing metallic constituents from dust obtained du

Details Process for removing metallic constituents from dust obtained du Process for removing metallic constituents from dust obtained du

1988-11-29

1989-12-26

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Elemental phosphorus

75 25, 423 44, 423 96, 423 97, 423107, 423108, 423135, 423304, 423322, C01B 2501, C01B 2502, C01B 2504

Patent

active

048897027

ABSTRACT:
Metallic constituents, especially heavy metal constituents are removed from dust electrostatically separated from a gas mixture consisting substantially of carbon monoxide and phosphorus in vapor form obtained during the electrothermal production of yellow phosphorus. To this end, the dust is initially calcined with continuous agitation under oxidizing conditions at temperatures of 300.degree. to 800.degree. C.; next, the resulting calcined matter is mixed with carbon and the mixture is treated at temperatures of 950.degree. to 1200.degree. C. under reducing conditions with volatilization of the metallic constituents; and the volatized metallic constituents are ultimately condensed and separated.

REFERENCES:
patent: 1820606 (1931-08-01), Easterwood
patent: 4396424 (1983-08-01), Yatsumami et al.
patent: 4537756 (1985-08-01), Rottgen et al.
patent: 4673431 (1987-06-01), Briemont
patent: 4678647 (1987-07-01), Lisowyj et al.

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