B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 1/00 (2006.01)
Patent
CA 2532768
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 weight percent of the tungsten of the tungsten. Preferred additives are lead oxide and calcium sulfate.
Lunk Hans-Joachim
Morgan Ricky D.
Stevens Henry J.
Fetherstonhaugh & Co.
Global Tungsten & Powders Corp.
Osram Sylvania Inc.
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