以氯化钠-碘化钾-丙醇体系萃取分离金(Ⅲ)

Separation of Gold(Ⅲ) by Extraction with the System of NaCl-KI-Propanol

摘要: 试验在氯化钠存在下,碘化钾-丙醇体系萃取分离以AuI-4络阴离子状态存在的金(Ⅲ)的最佳条件,结果表明:当溶液中碘化钾、氯化钠和丙醇的浓度分别为每升中0.3 g,200 g和300 mL,且溶液的酸度为pH 3.5时,能使AuI-4定量萃取,即在总体积为10 mL的溶液中,含碘化钾3 mg,氯化钠2 g和丙醇3 mL.萃取分离50 μg金(Ⅲ)时,1 mg铁(Ⅱ)、镍(Ⅱ)、锰(Ⅱ)、铝(Ⅲ)、锌(Ⅱ)、钴(Ⅱ)、镓(Ⅲ)等离子基本不被萃取,而与上述离子分离,金(Ⅲ)的萃取率达99.7%以上.

Abstract: Optimum conditions for the extraction of auric ion as anionic complex AuI-4 into propanol in the presence of sodium chloride were studied.It was found that quantitative separation of Au(Ⅲ) was achieved from a solution of pH 3.5,and containing 0.3 g of KI,200 g of NaCl and 300 mL of propanol in 1 L of solution.As a total volume of 10 mL (aqueous phase) was taken in the extraction process,3 mg of KI,2 g of NaCl and 3 mL of propanol were added.As shown by the experimental results,50 μg of Au(Ⅲ) was separated from 1 mg of Fe(Ⅱ),Ni(Ⅱ),Mn(Ⅱ),Al(Ⅲ),Zn(Ⅱ),Co(Ⅱ) and Ga(Ⅲ),with values of extraction rate of Au(Ⅲ) over 99.7%.