Process for lowering residual tantalum values in niobium
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United States of America Patent
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Aug 14, 1990
Grant Date -
N/A
app pub date -
Jul 11, 1989
filing date -
Jul 11, 1989
priority date (Note) -
Expired
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Abstract
The process for removing tantalum values from niobium values wherein a NbCl.sub.5 /TaCl.sub.5 charge mixture having a molar ratio from about 10/1 to about 10,000/1 is mixed with a 8N to 20N aqueous HCl solution at a total charge concentration of from about 50 to about 150 parts/100 parts by weight of the HCl solution to form a hydrolysis system, and wherein at least the surface of the hydrolysis system is contacted with air or a gas-containing air for a period of time within which a precipitate settles out at an average rate of from about 0.1 to about 6.0% by weight of the initial solids charge per hour.
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