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Production of Niobium and Tantalum.

Authors
Guidotti-RA; Kleespies-EK
Source
U S Pat 3 775 096 1973 Nov; :
Link
NIOSHTIC No.
10011966
Abstract
A process for producing Nb or Ta as powder (>99 pct pure) from its pentoxide consisted of nitriding in nh3 at 1,100 deg.-1,500 Deg. C for 40-50 h to remove o, and then, to remove n, heating either 5-10 min at approximately 3,000 deg. C or 4-5 h at 1,850 deg. C in vacuum. Niobium is nitrided in two stages, first forming an oxynitride in 2-3 h at 650 deg.-850 Deg. C and then reacting further with nh3 for 2-3 h at 1,100 deg.-1,500 Deg. C to remove o more completely. A suitable apparatus for the nitriding is described in which nh3 can be passed through a batch of 325-mesh oxide on a porous support inside a closed tube of heat resisting metal or ceramic, which in turn is inside an electric furnace. Metal of 99.5- 99.95 pct purity was produced from oxide by this method of intermediate nitriding.
Publication Date
19731101
Document Type
PA;
Fiscal Year
1974
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,775,096
NIOSH Division
RERC;
Source Name
U.S. Pat. 3,775,096; Nov. 27, 1973; Chem. Abstr. 80:P73,027a
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