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首页> 外文期刊>Separation and Purification Technology >Recovery of copper and recycling of acid from the leach liquor of discarded Printed Circuit Boards (PCBs)
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Recovery of copper and recycling of acid from the leach liquor of discarded Printed Circuit Boards (PCBs)

机译：从废弃印刷电路板（PCB）的浸出液中回收铜并回收酸

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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.
机译：当前的工作集中在使用溶剂萃取技术从废弃印刷电路板（PCB）的浸出液中回收金属和回收酸。在CSIR-NML开发的最佳条件下，将废PCB分离并进行浸出处理。此外，进行了系统的基础研究，分别使用磷酸三丁酯（TBP）和2-羟基-5-壬基苯乙酮肟（LIX 84IC）从PCBs的浸出液中回收硝酸（HNO3）和铜（Cu）。 。浸出液主要含有铜（22.97 g / L）和硝酸（6.3 mol / L）。研究和优化了各种工艺参数，即pH，萃取剂浓度，时间，相比，负载量等的影响。在15分钟的混合时间内，使用TBP以三比（O / A）3/1分三个阶段完成了HNO3的完全萃取。所获得的无酸浸出液进一步用于使用LIX 84IC选择性萃取Cu。 Mc-Cabe Thiele图表明，使用30％LIX 84IC在平衡pH 2，O / A比为1/1的情况下，接触时间为15分钟，可以分两个阶段提取接近99.99％的Cu。用5个触点中的10％硫酸（H2SO4）以1/1的相比（O / A）完全从负载的有机物中除去Cu。可以通过蒸发，沉淀，电解沉积，结晶等方法从纯铜溶液中生产金属或盐。（C）2015 Elsevier B.V.保留所有权利。

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