Solvent extraction of gold from alkaline cyanide solution by primary amine N1923

采用放射性同位素１９８Ａｕ示踪法研究了伯胺Ｎ１９２３和ＴＢＰ从碱性氰化液中萃取金（Ⅰ），考察了酸化率、水相ｐＨ值、萃取剂浓度等对萃取率的影响，以及ＮａＯＨ对载金有机相的反萃作用。结果表明，ＴＢＰ含量大于２０％，酸化的Ｎ１９２３与ＫＡｕ（ＣＮ）２摩尔比值在１：１时，金能够完全被萃取。载金有机相可采用０．ｌｍｏｌ·Ｌ－１的Ｎａ０Ｈ溶液定量反萃。机理研究表明，伯胺和ＴＢＰ萃取Ａｕ（ＣＮ）２－，符合ＢＣ类协同萃取机理。当金浓度大于１０ｇ·Ｌ－１时，在萃取有机相中形成纳米级的聚集体。The solvent extraction of gold from alkaline cyanide solution by primary amine N1923 and Tri-butylphosphate (TBP) was described by Au-198 radioactive tracer method. The influence of several variables such as acidification percentage, pH of raffinate solution, concentration of N1923, volume percentage of TBP were discussed. While volume percentage of TBP more than 20%, the ratio of acidificated N1923 and Au(CN)(-) bigger than 1, the N1923 system can extract gold from alkaline cyanide solution completely. The combined ratio of N1923, TBP and Au(CN)(2)(-) is 1: 1: 1 based on BC synergistic extraction mechanism. Aggregations are formed in the gold-loaded organic phase when gold concentration reaches 10g . L-1. The radius was measured by the dynamic laser scattering (DLS) method. The backward extraction by 0.1mol . L-1 NaOH system was also discussed.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000168792300007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)703343-3481