Process for the treatment of electric arc furnace dust

Details Process for the treatment of electric arc furnace dust Process for the treatment of electric arc furnace dust

1993-02-16

1994-08-09

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75961, 204118, 204128, 423 94, 423100, 423140, 423141, C22B 346

Patent

active

053362977

ABSTRACT:
In a process for the treatment of electric arc furnace (EAF) dust, the dust is first subjected to atmospheric leaching with a ferric chloride solution and thereafter subjected to treatment in an autoclave at an elevated temperature and pressure for conversion of low temperature stable goethite (FeO.OH) to a filterable crystalline hematite (Fe.sub.2 O.sub.3) in an acidic chloride solution. Zinc is recovered from the solution by solvent extraction using a solvating extractant followed by stripping and zinc recovery by electrolysis of zinc chloride solution. Lead is separated from the solution by cooling to precipitate lead chloride.

REFERENCES:
patent: 4610721 (1986-09-01), Duyvesteyn et al.
patent: 4610722 (1986-09-01), Duyvesteyn et al.
patent: 4614543 (1986-09-01), Duyvesteyn et al.
patent: 4888053 (1989-12-01), Grayson et al.

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