Purification method for producing high purity niobium compound and/or tantalum compound
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United States of America Patent
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Feb 13, 2007
Grant Date -
Nov 17, 2005
app pub date -
Feb 27, 2003
filing date -
Feb 27, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a method enabling the high purification of a niobium compound and/or tantalum compound in a simplified manner at a low cost. This is accomplished by providing a method enabling the high purification of a niobium compound and/or tantalum compound comprising the steps of preparing a solution containing niobium and/or tantalum, allowing a precipitate comprising niobium and/or tantalum to develop, separating the precipitate by filtration from the filtrate, converting the precipitate to a liquid melt or taking the filtrate, and separating a niobium compound from a tantalum compound or vice versa by utilizing the difference in solubility to the solvent between the niobium compound and the tantalum compound.
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