Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1991-04-26
1992-01-21
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C22B 500
Patent
active
050824937
ABSTRACT:
In a process for the hydrometallurgical treatment of electric arc furnace dusts which includes an acetic acid leach, the acetic acid solution used to perform the leach is made strong enough to dissolve heavy metal residues in the dusts, the iron-containing residues of which are recycled to a steel producing furnace. Zinc and other heavy metals are precipitated from hot acetic acid solution as useful products by the use of hydrogen sulphide. Calcium is then precipitated from the acetic acid solution as a clean gypsum using a deficiency of sulphuric acid, thus avoiding leaving sulphate ions in solution in sufficient concentration to interact with the dust and form sulphates in the iron containing residues when the acetic acid is recycled to the leaching step.
REFERENCES:
patent: 3293027 (1966-12-01), Machiw
patent: 3929598 (1975-12-01), Stern
patent: 4614543 (1986-09-01), Duyvesteyn
"The Hydrometallurgical Treatment of Carbon Steel Electric Arc Furnace Dusts by the UBC-Chaparral Process", Dreisinger et al., Journal of Hydrometallurgy, vol. 25, pp. 137-152, Oct. 1990.
"Hydrometallurgical Treatment Options for Carbon Steel Electric Arc Furnace Dusts" Dreisinger et al., Proceedings of second international conference on separation science & Technology published by CSChE, Oct. 1989.
Barrett Everett C.
Nenniger Emil H.
Hatch Associates Ltd.
Rosenberg Peter D.
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