正丁基苯并噻唑亚砜从硫脲介质中萃取金的机理研究

Extraction Mechanism of Gold(Ⅰ)by n-Butyl Benzothiazole Sulfoxides from Gold-Thiourea Leaching Solution

研究了正丁基苯并噻唑亚砜 (ASO)萃取酸性硫脲介质中金的机理。考察了[H+]和萃取剂浓度对分配比的影响 ,通过红外光谱法确定了其萃取过程为酸性离子缔合机理 ,萃取反应为 :ASO +H++Au(Tu) +2 +SO2 -4 [Au(Tu) 2 HSO4·ASO]采用斜率法确定萃合物的组成为Au[SC(NH2 ) 2 ]2 HSO4·ASO。并通过电导法判断在萃合物中Au(Tu) +2 与SO2 -4 以离子对形式存在。

The mechanism of Au(Ⅰ)extraction by n-butyl benzothiazole sulfoxides(ASO)from Au(Ⅰ)-thiourea leaching solution has been studied.The effect ofandon distribution ratio was investigated.IR analysis indicated that the reaction is an acidic association mechanism and the ion equation is shown as follows: ASO+H ++Au(Tu) + 2+SO 2- 4 [Au(Tu) 2HSO 4·ASO] The composition of extraction complex was determined by slope method and was Au[SC(NH 2) 2] 2HSO 4·ASO.Conductance method showed that Au(Tu) + 2 and SO 2- 4 exist in the form of ion pairs in extraction complex.