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Fine debismuthizing with calcium, magnesium and antimony

Authors
Journal
Transactions of Nonferrous Metals Society of China
1003-6326
Publisher
Elsevier
Publication Date
Volume
21
Issue
10
Identifiers
DOI: 10.1016/s1003-6326(11)61013-3
Keywords
  • Mine Engineering
  • Metallurgical Engineering
  • Chemistry And Chemical Engineering

Abstract

Abstract In order to achieve fine debismuthizing of lead bullion, the effects of temperature, adding amount of calcium and magnesium and antimony on the bismuth removal from lead bullion were investigated. The mechanism of debismuthizing was also discussed. The results show that when adding amounts of calcium and magnesium reach 0.112% and 0.395%, respectively, bismuth level of 0.001% (mass fraction) in the final lead is achieved at 330 °C, without the need for antimony addition. Maintaining addition amount of magnesium at 0.155%, when calcium addition amount is less than 0.09%, the concentration of peritectic reaction point, the bismuth concentration can be easily decreased to 0.001% by the following antimony treatment. But the effect of antimony treatment on debismuthizing gets bad if the calcium addition exceeds 0.09%.

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