Fire refining precious metals asay method
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United States of America Patent
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Jan 18, 1994
Grant Date -
N/A
app pub date -
Feb 18, 1993
filing date -
Feb 18, 1993
priority date (Note) -
Expired
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Abstract
A new environmentally safe fire refining precious metal assay method is provided wherein bismuth oxide is used with a special flux composition as the precious metal collector and the cupelling procedure is performed in a controlled temperature range.
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