摘要
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 (TB P ) was described by 1 9 8 Au 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 An(CN) - bigger than 1, the N1923 system can extract gold from alkaline cyanide solution completely. The combined ratio of N1923, TBP and An(CN)2 - is 1: l: 1 based on BC synergistic extraction mechanism。Aggregati o us 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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2001年第3期343-348,共6页
Chinese Journal of Inorganic Chemistry
基金
云南省省校科技合作项目(No.B9808K)。
