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Title: Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust

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 by 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 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. 1 figure.

Inventors:
;
Publication Date:
OSTI Identifier:
5163943
Patent Number(s):
US 5286465; A
Application Number:
PPN: US 7-905330
Assignee:
PTO; EDB-94-063819
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 29 Jun 1992
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; DUSTS; MATERIALS RECOVERY; IRON; METAL INDUSTRY; WASTE MANAGEMENT; ZINC; DISSOLUTION; ELEMENTS; INDUSTRY; MANAGEMENT; METALS; PROCESSING; TRANSITION ELEMENTS; WASTE PROCESSING; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

Zaromb, S., and Lawson, D.B. Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust. United States: N. p., 1994. Web.
Zaromb, S., & Lawson, D.B. Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust. United States.
Zaromb, S., and Lawson, D.B. Tue . "Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust". United States.
@article{osti_5163943,
title = {Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust},
author = {Zaromb, S. and Lawson, D.B.},
abstractNote = {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 by 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 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. 1 figure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {2}
}