Separation and Purification of Valuable Metals by Solvent Extraction with Karr Column

摘要

In this study, the separation of samarium to neodymium with Karr column was investigated. Separation properties of Sm/Nd binary system was estimated with experimental parameters such as flow rate, initial pH of aqueous phase, saponification of HEH[EHP] in organic phase and agitation speed. The extraction rate and distribution coefficient increased with increasing initial pH of aqueous phase at 16.5 ml/min(retention time 10 minute) of flow rate of organic and aqueous phase, and equilibrium pH of aqueous phase after extraction was maintained at 1.5 by saponified HEH[EHP]. In addition, the extraction rate and distribution coefficient were drastically increased with increasing saponification degree of PC88A and agitation speed, and optimal saponification degree was 40%. Extraction rate of Nd and Sm was 19.6% and 72.5% respectively at retention time 10 minute, initial pH 1, saponification degree 40% and agitation speed 120 rpm.