Hydrometallurgical process for recovering iron sulfate and zinc

Details Hydrometallurgical process for recovering iron sulfate and zinc Hydrometallurgical process for recovering iron sulfate and zinc

1992-06-29

1994-02-15

Andrews, Melvyn J.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

423109, 423146, 423530, 423541, 75961, C22B 702, C22B 308

Patent

active

052864650

ABSTRACT:
A process for recovering zinc/rich and iron-rich fractions from the baghouse dust that is generated in various metallurgical operations, especially in steel-making and other iron-making plants, comprises the steps of leaching the dust by hot concentrated sulfuric acid so as to generate dissolved zinc sulfate and a precipitate of iron sulfate, separating the precipitate from the acid by filtration and washing with a volatile liquid, such as methanol or acetone, and collecting the filtered acid and the washings into a filtrate fraction. The volatile liquid may be recovered distillation, and the zinc may be removed from the filtrate by alternative methods, one of which involves addition of a sufficient amount of water to precipitate hydrated zinc sulfate at 10.degree. C., separation of the precipitate from sulfuric acid by filtration, and evaporation of water to regenerate concentrated sulfuric acid. The recovery of iron may also be effected in alternative ways, one of which involves roasting the ferric sulfate to yield ferric oxide and sulfur trioxide, which can be reconverted to concentrated sulfuric acid by hydration. The overall process should not generate any significant waste stream.

REFERENCES:
patent: 3375069 (1968-03-01), Duval
patent: 3676107 (1972-07-01), Barnard et al.
patent: 4176160 (1979-11-01), Payonet

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