Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1987-04-30
1989-03-21
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 3, 75 53, 75 38, 75257, C21C 700
Patent
active
048140058
ABSTRACT:
A fused, hardened composition containing CaO, MgO and Al.sub.2 O.sub.3 for use in purifying molten metal during steel production and a method of making the same. The composition can be made up of electric arc furnace dust and lime or dolo-lime fines which would normally be wasted. The mixture of ingredients is hydrated, molded into a uniform size and carbonated using a CO.sub.2 containing gas and then heated so as to produce a molded non-dusting composition which dissolves quickly and uniformly in the slag process. Components such as PbO from the furnace dust which normally make slag a hazardous waste under environmental regulations, are reacted within the molded composition to form stable ceramic spinels. These spinels are not water soluble and therefore not subject to strict disposal requirements.
REFERENCES:
patent: 2308984 (1943-01-01), Kraner
patent: 3313617 (1967-04-01), Ban et al.
patent: 3519386 (1970-07-01), Fedock et al.
patent: 3726665 (1973-04-01), Minnick
patent: 3926616 (1975-12-01), Imperato
patent: 4003736 (1977-01-01), Kreiger
patent: 4093448 (1978-06-01), Eliseer
patent: 4336218 (1982-06-01), Kaas et al.
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