Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-06-04
1977-03-22
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 3, 75 25, C22B 1300
Patent
active
040134563
ABSTRACT:
A method for pretreating of flue dust having a content of lead therein, by which method the flue dust is fused at a relatively low temperature without any substantial reduction taking place, whereupon the slag thus formed is cooled until solidification, reagents for the improvement of the process and/or the material being added at one or more of the process steps before, during or after fusion of the flue dust, said reagents comprising slag-forming chemicals, a material for raising the melting temperatures, and a ferrous reduction agent. Item an apparatus for the pretreatment of flue dust in accordance with the above method and comprising a fusing furnace with a hearth and heating means and having an outlet leading to a vessel for collecting the molten material, conveying means for feeding the flue dust to the fusing furnace from a dust collecting device, and dispensing means for dispensing additive reagents to either the flue dust, the fusing furnace or the molten material flowing therefrom through the outlet or simultaneously to more of said positions and at a rate proportional to the flue dust feed rate. The vessel for collecting the molten material may comprise heating means and means for stirring the slag.
REFERENCES:
patent: 2139065 (1938-12-01), Betterton et al.
Andrews M. J.
Paul Bergsoe & Son a/s
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