No abstract

A procedure for the production of spectrographically pure niobium and tantalum oxides from columbitetantalite concentrates was developed in this study. The procedure involves a caustic fusion process and the separation of tantalum and niobium by liquid-liquid extraction. Disciplines ChemistryThis report is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ameslab_iscreports/152 .Iowa.. 5C This report is distributed according to the category Chemistry-General, as listed in TID-4500, January 15, 1957.This report was sponsored work. Conunission, nor Conunission:Legal Notice prepared as an account of Government Neither the United States, nor the any person acting on behalf of the A. Makes any warranty or representation, express or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process dis---closed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclQsed in this report.As used in the above, "person acting on behalf of the -Conunission" includes any employee or contractor of the Commission to the extent that such employee or contractor prepares, handles or distributes, or provides access to, anu information pursuant to his employment or contract with the Commission. A procedure for the production of spectrographically pure niobium and tantalum oxides from ooli.unbite-tantalite . concentrates was developed in this study. The procedure involves a caustic fusion process and the separation of tantalum and niobium by liquid-liquid extraction.

A new porous tantalum capacitor anode for liquid and solid electrolytic capacitors, p r e p a r e d directly by the reaction in situ of Ta~O~ and C is described. Porous in situ anodes with total interstitial contents (C, O, and N) of less than 0.02%, metallic i m p u r i t y contents less than the limit of chemical analytical detection, densities of a p p r o x i m a t e l y 4-12 g/cc, and specific capacitances of 1600-3200 ~coul/g were evaluated. Life tests of 1000 hr showed only slight changes in electrical characteristics for liquid electrolytic capacitors tested at 125v and 85~ and solid electrolytic capacitors tested at 34v and 125~