双(正-辛基硫醚)乙烷对银的萃取及其机理的研究

A STUDY ON THE EXTRACTION OF SILVER BY BIS [NOCTYL THIO ETHER] ETHANE AND ITS MECHANICS

研究了双（正－辛基硫醚）乙烷［Ｃ８Ｈ１７Ｓ（ＣＨ２）２ＳＣ８Ｈ１７］对贵金属银的萃取，研究了硝酸浓度和稀释剂对萃取银的影响，结果表明：在４～６ｍｏｌ／Ｌ硝酸介质中双（正－辛基硫醚）乙烷能定量地萃取银，是萃取银的较为有效的试剂。通过对液相萃合物的摩尔系列法，斜率法的分析以及对固态化合物的分析表明：该萃合物为多种组成的配合物，是较为复杂的体系。萃合物中银和双（正－辛基硫醚）乙烷的比例是随萃取体系中银与双（正－辛基硫醚）乙烷的不同比例而变化的，分别形成：Ａｇ：［Ｃ８Ｈ１７Ｓ（ＣＨ２）２ＳＣ８Ｈ１７］为２∶１，３∶２。

This paper is study on the extraction of the noble metal silver by Bis[noctyl thio ether]ethane[C8H17S(CH2)2SC8H17]and the impact of nitric acid concentration and the diluent on the extaction of silver.Experimental results reveal that Bis[noctyl thio ethter]ethane in a 46 mol/litro nitric acid medium is able to extract silver in substantial quantities,and therefore is a rather effective reagent.Analytical results of the liquid phase extract by the molar spectral/series method and the slope method as welias results of the analysis of its solid phase reveal that the extract is a multicomponent combination product which is a rather complex system.The proportion of silver to Bis[noctl thio ether]ethane in the extract varies with the ratio of silver to Bis[noctyl thio ether]ethane in the extraction system and forms respectively combintation products of Ag:[C8H17S(CH2)2SC8H17]with multicomponents in the ratio of 2∶1,3∶2,1∶2 and so on.