Process and plant for removing lead, cadmium and zinc from dusts

Details Process and plant for removing lead, cadmium and zinc from dusts Process and plant for removing lead, cadmium and zinc from dusts

1993-08-26

1995-09-19

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

423109, C22B 1300, C22B 1700, C22B 1900

Patent

active

054513820

ABSTRACT:
To remove lead, cadmium and zinc from dusts produced in the electrostatic precipitator in the electrothermal production of yellow phosphorus, the dusts are first digested by phosphoric acid having a content of at least 25% by weight of P.sub.2 O.sub.5 at temperatures above 60.degree. C. in a ventilated reaction zone. The digest solution is then separated in a filter zone into an essentially lead-, cadmium- and zinc-free solid residue and a phosphoric acid containing dissolved lead, cadmium and zinc.

REFERENCES:
patent: 3988240 (1976-10-01), Loewy et al.
patent: 4537756 (1985-08-01), Rottgen et al.
patent: 4889702 (1989-12-01), Kolkmann et al.
patent: 4904459 (1990-02-01), Kolkmann et al.

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