液膜萃取法回收废胶体钯活化液中的钯

传统钯回收方法存在成本高、分离效率低,适合高含量钯回收等问题,试验采用液膜萃取法回收废胶体钯活化液中的钯,并考察了内相试剂用量、流动载体用量、表面活性剂用量、油内比、乳水比、外相酸碱度等因素对钯萃取率的影响。结果表明:以9%N503、4%Span80、2%液体石蜡、85%磺化煤油组成膜相,内相试剂EDTA溶液浓度为0.2 mol/L,油内比为1∶1,乳水比为1∶5,外相pH值为2.0时,液膜萃取效果最好,钯萃取率可达96.6%。该方法具有效率高、成本低等优点,适合低含量钯的回收。

Recovery of palladium from waste colloidal palladium activation solution by liquid membrane extraction

Conventional method for palladium recovery has high cost and low separation efficiency and is fit for high palladium content.So,in the test,the palladium from waste colloidal palladium activation solution was recovered by liquid membrane extraction.At the same time,the effects of the dosage of internal phase,the dosage of flowing carrier,the dosage of surfactant,the oil internal ratio,the ratio of emulsion to water,the external pH on the extraction rate of palladium were discussed.The results show that when the membrane phase is composed of 9%N503,4%Span80,2%liquid paraffin and 85%sulfonated kerosene,the internal reagent was 0.2 mol/L EDTA solution,the oil internal ratio was 1∶1,the emulsion to water ratio was 1∶5,and the external pH is 2.0,the extraction effect is the best with liquid membrane,with the extraction rate of palladium reaching 96.6%.The method is more efficient,lower in cost and fit for low palladium content.