Refining of bismuth
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United States of America Patent
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-
Aug 10, 1993
Grant Date -
N/A
app pub date -
Apr 14, 1992
filing date -
Apr 14, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved process for deleading debismuthized dross is provided wherein the upgraded dross is treated by cupellation to form a slag until the level of bismuth in the upgraded dross reaches about 45% by weight. After cupellation, the partially deleaded upgraded dross may be treated by conventional means such as halogenation to provide a substantially pure bismuth product.
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