Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1978-05-16
1979-02-27
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 844, B22F 900
Patent
active
041417208
ABSTRACT:
Tantalum powders which have high oxygen, high sodium contents are reclaimed for practical applications by treating said powders with selected fused salt compositions. This process converts normally unleachable sodium metatantalate, recognized herein as a significant source of the powder's content of oxygen and sodium, to leachable forms of oxygen and sodium bearing compounds.
The conversion is accomplished by placing the high oxygen, high sodium tantalum powder, containing such metatantalate, in a fused salt bath which has the major portion of its composition equivalent to the final salts composition which would result from a reduction of potassium fluotantalate with sodium metal, under conditions where 90%-95% of required sodium stoichiometry was used and as a minor portion of composition contains small amounts of added potassium fluotantalate. The required amount of potassium fluotantalate is small in relation to the quantity of reclaimable tantalum powder treated by the process; i.e., the weight ratio of tantalum powder to be treated to tantalum contained in the added potassium fluotantalate (K.sub.2 TaF.sub.7) is in the range of 9:1 - 40:1.
REFERENCES:
patent: 2950185 (1960-08-01), Hellier et al.
patent: 3697255 (1972-10-01), Baldwin et al.
patent: 3829310 (1974-08-01), Mahy
patent: 3992192 (1976-11-01), Vartanian
patent: 4067736 (1978-01-01), Vartanian
Cohen Jerry
NRC, Inc.
Stallard W.
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