Separating Criterion of Pb, Cd, Bi and Zn from Metallic Particles of Crushed Electronic Wastes by Vacuum Evaporation
Separating Criterion of Pb, Cd, Bi and Zn from Metallic Particles of Crushed Electronic Wastes by Vacuum Evaporation
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真空蒸发法从破碎电子废物金属颗粒中分离Pb、Cd、Bi、Zn的标准
DOI：
10.1080/01496395.2011.625387
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发表时间：
2012-03
影响因子：
2.8
通讯作者：
Zhan Lu, Zhenming Xu（*）
中科院分区：
文献类型：
--
作者：
Zhan Lu, Zhenming Xu（*）
在处理电子废弃物时，通常采用破碎工艺。混合金属颗粒可以通过多种分离方法得到。大多数金属都是以基本物质的形式存在，它们的蒸气压相差很大。对于蒸气压较高的金属，采用真空冶金分离法进行分离。然而，金属颗粒的真空蒸发规律与传统理论不同。仅根据金属之间的沸点差不能获得满意的分离这些金属颗粒的参数。本文首先研究了单一金属颗粒（Pb、Zn、Cd和Bi）的蒸发动力学和蒸发机理。从而得到了这些金属相互分离的判据。在分离判据的指导下，成功地分离了不同种类的混合金属颗粒，目标金属的分离效率大于90wt%。该研究为电子垃圾中高蒸气压重金属的分离提供了理论依据。
The crushing process is usually adopted during the treatment of electronic wastes. Mixed metallic particles can be obtained after several kinds of separation methods. Most of the metals exist as elementary substances and their vapor pressure is quite different. For the metals with high vapor pressure, vacuum metallurgy separation is used to separate these metals. However, the vacuum evaporation rule of metallic particles is different from the traditional theory. Satisfactory parameters for separating these metallic particles could not be obtained merely according to the boiling point difference between metals. In this paper, the evaporation kinetics and mechanism of single metallic particles (Pb, Zn, Cd, and Bi) are investigated first. Then the criterion of separating these metals from each other is obtained. Under the instruction of separation criterion, different kinds of mixed metallic particles are successfully separated with the separation efficiency of the target metal more than 90 wt%. This study provides theoretical foundations for separating the heavy metals with high vapor pressure from e-wastes.
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