萃金体系第三相的产生及其谱学研究

Abstract

利用1 98 Au示踪法研究了十四烷基二甲基苄基氯化铵从碱性氰化液中萃取金第三相的产生过程 ,同时用傅里叶变换红外光谱 (FTIR)、核磁共振 (NMR)、激光光散射 (DLS)等方法分析了第三相形成后上下两有机相的微观结构。结果表明 ,随着有机相中金浓度的增大 ,有机相中有纳米级的聚集体形成 ;当金浓度继续增大时 ,有机相分为上下两相。有机相中的金、磷酸三丁酯 (TBP)和水主要集中在下层。下层有机相有明显的水特征吸收峰 ,TBP的PO伸缩振动向低频移动 ,核磁共振 (31 P NMR)的化学位移明显移向高场 ;用激光光散射技术测定了两有机相中聚集体的大小。

The formation of the third phase during the gold extraction from cyanide solution by quaternary ammonium, tetradecyldi-methylbenzylammonium chloride (TDMBAC) was studied by Au-198 tracer method. The microstructure of the organic phases was investigated by FTIR, P-31-NMR. With the increasing of gold concentration, aggregations were formed in the gold-loaded organic phase. With the further increasing of gold concentration, the organic phase turned into two layers. Gold, water, and tri-n-butyl phosphate (TBP) were mainly in the down organic phase. In the down layer, distinct O-H stretching vibration peak was found by FTIR; the frequency of P=O stretching vibration shifted to the low frequency; P-31-NMR chemical shift was markedly shifted to the high frequency field, The radius of aggregation was measured by the dynamic laser scattering (DLS) method.