Process for the treatment of electric and other furnace...

Details Process for the treatment of electric and other furnace... Process for the treatment of electric and other furnace...

2006-05-03

2010-02-23

Mayes, Melvin C (Department: 1793)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

Reexamination Certificate

active

07666372

ABSTRACT:
The present invention is a method of recovering valuable metals from a quantity of furnace dust consisting the following steps. A first leaching step wherein the furnace dust is leached at atmospheric pressure in a first leaching solution to produce a first leach liquor and a first leach residue, the first leaching solution consisting of an aqueous mineral acid solution. The first leach liquor is then separated from the first leach residue. A second leaching step is then performed wherein the first leach residue is atmospherically leached in a second leaching solution to form a second leach liquor and a second leach residue, the second leaching solution comprising a solution of aqueous HCl with a reductant. The second leach liquor is then separated from the second leach residue. A zinc precipitation step is then performed wherein zinc is precipitated from the second leach liquor by treating the second leach liquor with a quantity of alkali, the quantity of alkali selected to adjust the pH of the second leach liquor sufficiently to precipitate out the zinc in the form of a zinc salt in a third residue leaving a third liquor and then separating the third residue containing zinc from the third liquor.

REFERENCES:
patent: 4256723 (1981-03-01), Urban, Jr.
patent: 5912402 (1999-06-01), Drinkard et al.
patent: 935005 (1999-08-01), None
patent: 1218762 (1977-04-01), None

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