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Betterton-Kroll process
The Betterton-Kroll process is an industrial process for removing bismuth from lead.
Calcium and magnesium are added to a molten lead-bismuth bath, the resulting bismuth compounds have higher melting points and lower densities than the lead, and can be removed as dross. The compounds are treated with chlorine to free up the bismuth.
Temperature used in the process is about 380-500°C.
The other major processes for separating the two metals are by fractional crystallization and by the Betts electrolytic process.
Last updated: 10-18-2005 16:58:04
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details