Method for controlling the oxygen content in valve metal materia

Details Method for controlling the oxygen content in valve metal materia Method for controlling the oxygen content in valve metal materia

1996-04-05

1999-11-30

Heinrich, Samuel M.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75228, 75245, 75249, 75343, 75369, 148513, 148514, 148577, 148668, B22F 100

Patent

active

059935138

ABSTRACT:
A method for controlling oxygen in valve metal materials. The method includes deoxidizing a valve metal material, typically tantalum, niobium, or alloys thereof, and leaching the material in an acid leach solution at a temperature lower than room temperature. In one embodiment of the present invention, the acid leach solution is prepared and cooled to a temperature lower than room temperature prior to leaching the deoxidized valve metal material. The method of the present invention has been found to lower both the oxygen and fluoride concentrations in valve metal materials, as the use of reduced acid leach temperatures provide lower oxygen for a given quantity of a leach acid, such as hydrofluoric acid.

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