Recovery of copper and recycling of acid from the leach liquor of discarded Printed Circuit Boards (PCBs)
Recovery of copper and recycling of acid from the leach liquor of discarded Printed Circuit Boards (PCBs)
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DOI：
10.1016/j.seppur.2015.10.012
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发表时间：
2015-12-17
影响因子：
8.6
通讯作者：
Pathak, D. D.
中科院分区：
文献类型：
--
作者：
Choubey, Pankaj Kumar;Panda, Rekha;Pathak, D. D.
本文研究了溶剂萃取法从废弃印刷电路板（PCB）浸提液中回收金属和酸的工艺。在CSIR-NML，我们的团队开发的最佳条件下，对废弃的PCB进行分离和处理以进行浸出。在此基础上，分别用磷酸三丁酯（TBP）和2-羟基-5-壬基苯乙酮肟（LIX 84 IC）从多氯联苯浸出液中回收硝酸（HNO 3）和铜（Cu），进行了系统的基础研究。浸出液中主要含Cu（22.97 g/L）和硝酸（6.3 mol/L）。研究了pH值、萃取剂浓度、萃取时间、相比、负载量等工艺参数对萃取效果的影响。采用TBP分三个阶段在相比（O/A）为3/1、混合时间为15 min的条件下实现了HNO 3的完全萃取。Mc-Cabe Thiele图表明，类似于99.99%的铜可以提取在两个阶段中使用30%的LIX 84 IC在平衡pH 2，O/A比1/1的接触时间为15分钟。完全剥离铜从负载的有机物中实现与10%的硫酸（H2SO 4）在5个接触的相比（O/A）为1/1。从纯铜溶液中可以通过蒸发、沉淀、电解、结晶等方法生产金属或盐。（C）2015 Elsevier B. V.保留所有权利。
Present work is focused on the recovery of metal and recycling of acid from the leach liquor of discarded Printed Circuit Boards (PCBs) using solvent extraction technique. The waste PCBs are segregated and processed for leaching under the optimized condition developed by our group at CSIR-NML. Further, the systematic basic studies were carried out to recover nitric acid (HNO3) and copper (Cu) from the leach liquor of PCBs using tri-butyl phosphate (TBP) and 2-hydroxy-5-nonylacetophenone oxime (LIX 84IC), respectively. The leach liquor mainly contains Cu (22.97 g/L) and nitric acid (6.3 mol/L). Various process parameters viz, effect of pH, extractant concentration, time, phase ratio, loading capacity, etc. were studied and optimized. Complete extraction of HNO3 was achieved using TBP in three stages at phase ratio (O/A) 3/1 in mixing time of 15 min. The acid free leach liquor obtained was further used for selective extraction of Cu using LIX 84IC. Mc-Cabe Thiele plot indicates similar to 99.99% Cu can be extracted in two stages using 30% LIX 84IC at an equilibrium pH 2,O/A ratio 1/1 in contact time of 15 min. Complete stripping of Cu from loaded organic was achieved with 10% sulfuric acid (H2SO4) in 5 contacts at a phase ratio (O/A) of 1/1. From the pure copper solution metal or salt could be produced by evaporation, precipitation, electrowinning, crystallization, etc. (C) 2015 Elsevier B.V. All rights reserved.