摘要
为了实现铅的深度除铋,对钙、镁添加量以及锑处理和温度对铅中除铋深度的影响进行研究,并对除铋机理进行讨论。结果表明,当钙、镁添加量分别达到0.112%和0.395%时,在330℃时不用添加锑就可以使产品的含铋量降低到0.001%。维持镁加入量为0.155%,当钙添加量低于0.09%(包晶反应点的浓度),随后采用锑处理可以很容易使铋含量降到0.001%;但当钙添加量大于0.09%时,锑处理对除铋的作用效果越来越差。
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 ℃,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%.
关键词
除铋
克罗尔-别特尔顿法
锑处理
包晶反应
debismuthizing
Kroll-Betterton process
antimony treatment
peritectic reaction
