Removal of binder from Ta products
AssigneeH. C. Starck GmbH
InventorsTerrance B. Tripp, Malcolm Shaw
Life of this patent
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Abstract
Tantalum anode pellets or tantalum powders are treated to remove carbon content (mostly attributable to binders used in pressing the powders to pellet form and/or sintering of the pellets) by an aqueous leach at 50.degree.-200.degree. F. in lieu of the conventional complex distillation/decomposition methods.
Claims13
Process of recovery of binder-pressed tantalum pellets with 0.1-3.0 w/o of a carbonaceous binder comprising the step of contacting the pellets at temperatures of 50.degree.-200.degree. F. with aqueous leach liquor and leaching sufficiently to remove at least 95% by weight of binder-source carbon content thereof while maintaining oxygen content of the pellet substantially constant, the said reduction of carbon content being achieved without heating for distillation/decomposition of binder.
A process for treatment of tantalum from binder-pressed-and-double-sintered anode pellets for removal of binder source carbon therefrom without material oxygen pickup in the course of carbon removal, the process comprising the steps of contacting the pellet with an aqueous leach liquor and maintaining the pellet in contact with the leach liquor at 50.degree.-200.degree. F. and sufficiently long to remove at least 95 weight percent of binder carbon content thereof such steps being essentially the only steps undertaken to effect such reduction of carbon content.
Dependencies are inferred from the claim text.