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首页> 外文会议>41th Annual Conference of Metallurgists of CIM International Symposium on New Technology Implementation Metallurgical Processes Aug 11-14, 2002 Montreal, Quebec, Canada >Low chlorine process to recover bismuth from lead de-bismuthizing dross
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Low chlorine process to recover bismuth from lead de-bismuthizing dross

机译：低氯工艺从铅脱铋渣中回收铋

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摘要

The refining of lead bullion by the Kroll-Betterton process generates a debismuthizing dross, i.e., a lead dross or alloy that contains 3 wt.% to 7 wt.% bismuth. The high metal content of the dross merits the economic recovery of both lead and bismuth. Industrial practice is to concentrate the bismuth into an enriched Pb-Bi alloy and then to separate the lead from the alloy by preferential chlorination to lead chloride, which is disposed. There are various means to upgrade the de-bismuthizing dross but to not more than 30 wt.% Bi. It has been discovered that the use of suitable acidic slag additions to a Pb-Bi alloy melt, in particular phosphorus pentoxide (P_2O_5), allows for the preferential oxidation of lead away from the bismuth without excessive oxidation of the bismuth. The result of this procedure is an alloy of high bismuth content, 98 wt% Bi ― 2 wt% Pb, that can have the lead removed using much smaller amounts of chlorine; 3% of that required for the conventional route, and therefore significantly reduce the amount of lead-chloride produced. Both of these process advantages, particularly the latter, are environmentally and economically significant since the contained lead is now recovered rather than disposed. Experimental studies proving the principle of the process and a mass balance of a possible commercial scale implementation are presented.
机译：通过Kroll-Betterton法精制铅锭会产生去铋渣，即铅渣或合金中铋的含量为3-7重量％。锡渣中的高金属含量有利于铅和铋的经济恢复。工业实践是将铋浓缩成富集的Pb-Bi合金，然后通过优先氯化生成氯化铅来将铅从合金中分离出来。有多种方法可以使脱铋渣的含量提高到Bi含量不超过30％（重量）。已经发现，在Pb-Bi合金熔体中使用合适的酸性炉渣添加剂，特别是五氧化二磷（P_2O_5），可以使铅优先地从铋中氧化出来，而不会导致铋的过度氧化。此过程的结果是铋的含量高，Bi含量为98 wt％-Pb含量为2 wt％，可以用较少量的氯去除铅。常规路线所需量的3％，因此大大减少了氯化铅的产生量。这两种方法的优势，特别是后者的优势，在环境和经济上都很重要，因为现在可以回收而不是处置所含的铅。实验研究证明了该过程的原理和可能的商业规模实施的质量平衡。

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