Vacuum Separation Behavior of Pb from Copper-Rich Particles of Crushed E-Wastes
Vacuum Separation Behavior of Pb from Copper-Rich Particles of Crushed E-Wastes
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DOI：
10.1080/01496395.2014.923458
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发表时间：
2014-06
影响因子：
2.8
通讯作者：
Lu Zhan;Zhenming Xu
中科院分区：
文献类型：
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作者：
Lu Zhan;Zhenming Xu
由于缺乏适当的处理方法，电子垃圾处理不当造成的铅污染日益引起人们的关注。本文研究了Pb在Cu和其他金属颗粒（Cd、Bi、Zn）存在下的分离行为，以期从破碎的电子垃圾的富铜颗粒中有效分离和回收各种金属。采用真空冶金分离法从电子垃圾破碎后的富铜颗粒中分离回收Pb。由于富铜颗粒中金属的多样性和复杂性，本文研究了Cu、Cd、Bi和Zn对Pb真空分离和回收的影响。结果表明，Cu粒子对Pb的蒸发既有正向的分散作用，又有负向的阻隔作用。Cd优先蒸发，Pb蒸气压差大，有利于分离。低蒸气压形成的Pb- bi合金使Pb的分离更加困难。由于凝结特性的不同，Pb和Zn可以从Cu颗粒中一起蒸发，然后分别在不同的位置凝结为纯Pb和纯Zn。
Due to lack of proper treatment methods, Pb pollution caused by improper treatment of electronic wastes (e-waste) has been attracting increasing attention. This paper investigates the separation behavior of Pb in the presence of Cu and other metallic particles (Cd, Bi, and Zn), in order to separate and recover various metals effectively from the copper-rich particles of crushed e-wastes. Vacuum metallurgy separation method is adopted to separate and recover Pb from the copper-rich particles of crushed e-wastes. Due to the variety and complexity of metals in copper-rich particles, this paper studies the effects of Cu, Cd, Bi, and Zn on vacuum separating and recycling of Pb. It is found that Cu particles have both a positive dispersing and a negative blocking effect on Pb evaporation. Cd can be evaporated preferentially, and then Pb can be subsequently separated for their huge vapor pressure gap. The formation of Pb-Bi alloy with a low vapor pressure makes the separation of Pb more difficult. As a result of different condensation characteristics, Pb and Zn can be evaporated together from Cu particles, and then be respectively condensed on different positions as pure Pb and Zn.