(1. 昆明貴金屬研究所， 昆明 650221;
2. 北京大學(xué) 分子與化學(xué)工程學(xué)院國家稀土材料化學(xué)重點實驗室， 北京 100871)
摘 要: 研究了陽離子表面活性劑萃取劑惰性稀釋劑 Au(CN)2-體系萃金過程中鹽析效應(yīng)的規(guī)律。結(jié)果表明鹽析劑的加入反而降低了金的萃取率。這說明鹽析劑的作用機制與萃合物在負載有機相中的存在狀態(tài)及結(jié)構(gòu)密切相關(guān)。鹽析劑的加入降低了水相中水分子的活度，不利于生成有機相中以水分子為橋的CTMA+·H2O·TBP締合大陽離子萃合物。對傳統(tǒng)的溶劑萃取鹽析效應(yīng)提出了一些新的觀點。
關(guān)鍵字: 金; 表面活性劑; 溶劑萃取; 鹽析效應(yīng)
Au(CN)2- solvent extraction by CTMAB
（1. Kunming Institute of Precious Metals, Kunming 650221, P.R.China；
2. State Key Laboratory of Rare Earth Materials Chemistry and Applications,
College of Chemistry and Molecular Engineering,
Beijing University, Beijing 100871, P.R.China）
Abstract:The abnormal influence of salting-out agent on the Au(CN)2- solvent extraction by CTMAB was discussed. The results show that the addition of salting-out agent decreases the gold extraction, which means the action mechanism of salting-out agents is closely related with the existence state and structure of the extractive complex in the loading-organic phases. The addition of salting-out agent decreases the activity of H2O in the aqueous phases, harms to the formation of CTMA+•H2O•TBP. These results also bring some new ideas into the traditional theories of solvent extraction salting-out effect.
Key words: gold; surfactant; solvent extraction; salting-out effect
