Process for working up heavy metal-containing residues originall

Details Process for working up heavy metal-containing residues originall Process for working up heavy metal-containing residues originall

1987-04-16

1988-08-09

Stoll, Robert L.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

4236585, 210634, 210688, C01B 2546

Patent

active

047626933

ABSTRACT:
Residue obtained upon the removal of heavy metal contaminants from crude phosphoric acid by means of a dialkyldithiophosphoric acid ester and adsorbent is worked up into ecologically reliable solid matter and into a heavy metal concentrate. The solid matter and heavy metal concentrate are separated from one another by successive mechanical and chemical treatment. The sequential order of these two operational steps can be inversed.

REFERENCES:
patent: 4452768 (1984-05-01), Gradl et al.
patent: 4466948 (1984-08-01), Schimmel et al.
patent: 4503016 (1985-03-01), Schimmel et al.
patent: 4596703 (1986-06-01), Gradi et al.

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