Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1986-09-08
1988-08-23
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 28, 423 97, 423108, C22B 702
Patent
active
047658290
ABSTRACT:
According to the instant invention fine and very fine granular zinc- and lead-containing oxidic byproducts are mixed with thermally inert additives and are hot briquetted with caking coal as a binder at a temperature of 490.degree..+-.40.degree. C. using sufficient carbon to reduce all of the metallic components in the byproducts. Then this mixture is briquetted and heated to more than 700.degree. C. and is maintained at this high temperature for a predetermined time to reduce, that is deoxidize, most of the oxidic components of the briquets, especially zinc, lead, and iron oxides. When the byproducts are not dry, which is standard with a wet scrubbing system for cleaning stack gases, the resultant slurry must be dried before it can be treated according to this invention. The carbon according to the invention is added as fine-granular caking coal in portions of at least 20% by weight. Preferably the portion is between 25% and 35% and up to 40%.
REFERENCES:
patent: 2442674 (1948-06-01), Bardwell
patent: 3770416 (1973-11-01), Goksel
patent: 4363654 (1982-12-01), Frederick et al.
patent: 4396424 (1983-08-01), Yatsunami et al.
patent: 4612041 (1986-09-01), Matsuoka et al.
Beckmann Franz
Schmit Romain
Wagner Armand
Andrews Melvyn J.
Dubno Herbert
Laborlux S. A.
Wilford Andrew
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