US 7,214,362 B2 · Purification method for producing high purity niobium compound and/or tantalum compound

Abstract

An object of the present invention is to provide a method for purifying a highly pure niobium compound and/or tantalum compound, the method enabling the purification of a highly pure niobium compound and tantalum compound in a simplified manner at a low cost. The object is met by providing a method comprising adding an organic solvent to an aqueous solution containing a niobium compound and/or tantalum compound together with impurities, and then performing extraction via the solution. A niobium compound and/or tantalum compound dissolved in a solution is allowed to precipitate, and said aqueous solution is obtained by dissolving the precipitate in water.

Claims16

Dependent claims

A method for obtaining a highly pure niobium compound, comprising:

dissolving a first niobium compound including tantalum as an impurity in an HF solution to form a second solution;
precipitating crystals comprising a second niobium compound from the second solution to form precipitated crystals and a third solution;
separating said precipitated crystals from said third solution;
dissolving said precipitated crystals in an aqueous solution or melting said precipitated crystals to obtain a melt;
adding an organic solvent to said melt or to said aqueous solution in which said precipitated crystals are dissolved;
conducting extraction with said organic solvent;
and
recovering said highly pure niobium compound.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/505,803Filed 27 Feb 2003

Priority

JP 2002-05241227 Feb 2002

Published

US 2005/0115364 A12 Jun 2005

Granted

8 May 2007

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

C01G 33/003
Compounds of niobium: preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
C01G 33/00
Compounds of niobium
C01G 35/00
Compounds of tantalum
C01G 35/003
Compounds of tantalum: preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange

Purification method for producing high purity niobium compound and/or tantalum compound

Life of this patent

Purification method for producing high purity niobium compound and/or tantalum compound

Life of this patent

Abstract

Claims16