Method for making ammonium metatungstate
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United States of America Patent
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May 7, 2013
Grant Date -
Jan 6, 2011
app pub date -
Aug 4, 2010
filing date -
Aug 12, 2008
priority date (Note) -
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Abstract
A method for producing ammonium metatungstate from ammonium paratungstate includes preparing an ammonium paratungstate mixture including solid ammonium paratungstate and water. The mixture is contacted with a cation exchange material to lower a pH of the mixture to a pH range wherein metatungstate ion is stable and an insoluble tungstic acid is not formed. The pH of the mixture may be maintained in the pH range until the ammonium paratungstate mixture is converted into an ammonium metatungstate solution.
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