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

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.
Inventors:
 [1];  [2]
  1. (95706 William Dr., Hinsdale, IL 60521)
  2. (925 Putnam Dr., Lockport, IL 60441)
Issue Date:
OSTI Identifier:
869160
Assignee:
Zaromb, Solomon (95706 William Dr., Hinsdale, IL 60521);Lawson, Daniel B. (925 Putnam Dr., Lockport, IL 60441) ANL
Patent Number(s):
US 5286465
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
hydrometallurgical; process; recovering; iron; sulfate; zinc; baghouse; dust; rich; iron-rich; fractions; generated; various; metallurgical; operations; especially; steel-making; iron-making; plants; comprises; steps; leaching; hot; concentrated; sulfuric; acid; generate; dissolved; precipitate; separating; filtration; washing; volatile; liquid; methanol; acetone; collecting; filtered; washings; filtrate; fraction; recovered; distillation; removed; alternative; methods; involves; addition; sufficient; amount; water; hydrated; 10; degree; separation; evaporation; regenerate; recovery; effected; roasting; ferric; yield; oxide; sulfur; trioxide; reconverted; hydration; overall; significant; waste; stream; iron sulfate; sufficient amount; waste stream; sulfuric acid; sulfur trioxide; concentrated sulfuric; overall process; metallurgical process; volatile liquid; various metal; alternative methods; alternative method; ferric oxide; zinc sulfate; metallurgical operations; hot concentrated; baghouse dust; /423/75/