The solvent extraction of copper from simulated ammoniacal spent etchant with 1-(4'-dodecyl)-phenyl-3-tertiary butyl-1,3-octadione (HR) was studied,and a model of extraction isotherm was proposed and verified with equilibrium extraction constant.The influence of equilibration time,extractant concentration and phase ratio on the extraction of copper was studied at (298±0.5) K.For the spent etching solutions containing 112.98 g/L Cu,6 mol/L NH3 and 1 mol/L NH4+,the optimal solvent extraction condition of copper was obtained in one-stage solvent extraction at phase ratio of 5:4 with 40％ HR in sulphonated kerosene for 5 min.The copper concentration in the raffinate decreased to 63.24 g/L and raffinate can be favorably recycled to the etching solution.The stripping studies were carried out with the simulated copper spent electrolyte containing 30 g/L Cu and 180 g/L H2SO4.The stripping ratio is 98.27％ from the loaded organic phase after one-stage stripping at phase ratio of 1:2 at (298±0.5) K.%采用高位阻β-二酮1-(4’十二烷基)苯基-3-叔丁基-1,3-丙二酮)作为萃取剂从模拟印刷电路板(PCBs)蚀刻废液中萃取铜.利用离子强度与萃取反应平衡常数的关系校正模拟的萃取等温线,该模拟萃取等温线与实验测得萃取等温线基本相符.通过实验确定萃取剂浓度、相比、萃取级数和反萃级数等萃取工艺参数.结果表明,在室温下对于铜离子浓度为112 g/L、总氨浓度为7 mol/L的模拟氨性蚀刻废液的最佳萃取条件为:萃取剂浓度为40％,相比为5∶4,萃取时间为5min.在此条件下,经过一级萃取,蚀刻废液中铜离子浓度可降低至63.24 g/L,能返回到电路板的生产中循环使用.用含铜30g/L,硫酸浓度180 g/L的模拟废电解液对负载有机相进行反萃,相比(O/A)为1∶2,经一级反萃,铜的反萃率可达98.27％.
展开▼
