Analysis of key patents of the regeneration of acidic cupric chloride etchant waste and tin stripping waste

被引：23
|
作者：
Keskitalo, Tiina
Tanskanen, Juha
Kuokkanen, Toivo
机构：
[1] Oulu Univ, Chem Proc Engn Lab, Dept Proc & Environm Engn, FI-90014 Oulu, Finland
[2] Oulu Univ, Dept Chem, FIN-90014 Oulu, Finland
来源：
RESOURCES CONSERVATION AND RECYCLING | 2007年 / 49卷 / 03期
关键词：
etching; etchant waste; cupric chloride; tin stripping; regeneration;
D O I：
10.1016/j.resconrec.2006.05.001
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Spent acidic cupric chloride etchant waste and tin stripping waste from printed circuit board (PCB) industry are classified as hazardous wastes. They contain significant amounts of metals and acid. Usually, spent cupric chloride and tin stripping solutions are shipped off-site for reclamation. At the moment, a large proportion of acidic cupric chloride etchant waste and tin stripping waste are treated by neutralization, resulting in metal-bearing sludge that often ends up in special landfills. This wastes valuable natural resources, which could otherwise be recycled. This paper presents a review of some patented methods developed for the regeneration of acidic cupric chloride etchant waste and tin stripping waste. These methods are based on electrowinning, cementation, solvent extraction. precipitation and membrane technology. The advantages and disadvantages of these developed processes are summarized. It can be seen that there is still a need to develop more efficient and economical processes for the regeneration of acidic cupric chloride etchant waste and tin stripping waste. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：217 / 243
页数：27
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