正丙醇-溴化钾-氯化钠体系萃取分离金(III)

Extraction Separation of Au(III) by Potassium Bromide-n-Propyl Alcohol in the Presence of Sodium Chi

摘要: 研究了氯化钠存在下,氯化钠-溴化钾-正丙醇体系萃取分离Au(III)的行为,实验表明,Au(III)与B r-形成的AuB r4-很容易被萃取到正丙醇相中,当溶液中氯化钠、溴化钾和正丙醇的浓度分别为0.20 g.mL-1、0.20 mg.mL-1、0.30mL.mL-1,pH=2.5时,能使Au(III)定量萃取.V(Ⅴ)、Ga(III)、N i(II)、A l(III)、Zn(II)、U(IV)等离子基本不被萃取,实现了Au(III)与上述离子的分离.

Abstract: Liquid-liquid extraction of Au(III) based on KBr-n-propyl alcohol in the presence of Sodium Chioride has been studied.The results show that AuBr_4~-can be easily extracted into the n-propyl alcohol phase.The extraction rate of Au(III) reaches 99.97% when the concentration of KBr,NaCl and n-propyl alcohol in system are 0.20 mg·mL~(-1),0.20 g·mL~(-1)and 0.30 mL·mL~(-1),respectively. Au(III) could be separated effectively from V(Ⅴ),Ga(III),Ni(II),Al(III),Zn(II) and U(IV) at pH 2.5.