| 摘要 |
<p>A purification method for producing a high purity niobium compound and/or tantalum compound, characterized in that it comprises forming a niobium compound and/or a tantalum compound by the use of a crystal obtained by crystallization from a solution containing niobium or tantalum, or a melt or a filtrate therefrom, and separating a high purity niobium compound and/or tantalum compound by utilizing the difference in solubility between them. The purification method allows the purification of a niobium compound and/or a tantalum compound to a high purity product with an easier and simpler procedure at a reduced cost.</p> |
