Additives for Suppressing Tungsten Leachability
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United States of America Patent
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Issued Date -
Sep 7, 2006
app pub date -
Jan 9, 2006
filing date -
Jan 24, 2005
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Abandoned
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Abstract
The leachability of tungsten in an aqueous medium may be suppressed by combining tungsten metal with a metal oxide or metal salt that will form an insoluble tungsten-containing compound when the mixture is brought into contact with an aqueous medium. The additive is preferably present in an amount from about 1 weight percent (wt. %) to about 10 weight percent of the tungsten of the tungsten. Preferred additives are lead oxide and calcium sulfate.
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