Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1982-12-28
1983-12-20
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 10R, 75 82, 751227, C22B 2306, C22B 6002
Patent
active
044215568
ABSTRACT:
The invention is a process for decontaminating particulate nickel contaminated with actinide-metal fluorides. In one aspect, the invention comprises contacting nickel-fluoride-coated nickel with gaseous ammonia at a temperature effecting nickel-catalyzed dissociation thereof and effecting hydrogen-reduction of the nickel fluoride. The resulting nickel is heated to form a melt and a slag and to effect transfer of actinide metals from the melt into the slag. The melt and slag are then separated. In another aspect, nickel containing nickel oxide and actinide metals is contacted with ammonia at a temperature effecting nickel-catalyzed dissociation to effect conversion of the nickel oxide to the metal. The resulting nickel is then melted and separated as described. In another aspect nickel-fluoride-coated nickel containing actinide-metal fluorides is contacted with both steam and ammonia. The resulting nickel then is melted and separated as described. The invention is characterized by higher nickel recovery, efficient use of ammonia, a substantial decrease in slag formation and fuming, and a valuable increase in the service life of the furnace liners used for melting.
REFERENCES:
patent: 3867136 (1975-02-01), Eriksson et al.
Williams Joe L.
Windt Norman F.
Andrews M. J.
Besha Richard G.
Hamel Stephen D.
Lewis Fred O.
The United States of America as represented by the United States
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