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用斜率法确定了萃取机理,用饱和容量法确定了萃合物的组成。测定了15个稀土元素的萃取平衡常数K(cx)、logK(cx)和pH值(萃取率E=50%时)与原子序数间存在着明显的“四分级效应”。测得相邻元素间的平均分离因素为2.78。各项结果均与用P507的正十二烷溶液的萃取很一致,说明固-夜萃取和液-液萃取的原理是相的。但用熔化石蜡作溶剂研究萃取机理,存其一定的优越性,如准确、简单、快速、安全、经济等。
The extraction mechanism was determined by the slope method, and the composition of the extract was determined by the saturation capacity method. The extraction equilibrium constants K (cx), log K (cx) and pH (extraction rate E = 50%) of fifteen rare earth elements were determined to have obvious “quaternary effect” with the atomic number. The average separation factor between adjacent elements was 2.78. The results are in good agreement with the extraction of n-dodecane using P507, indicating that solid-night extraction and liquid-liquid extraction are facultative. However, the use of melted paraffin as a solvent extraction mechanism, save its certain advantages, such as accurate, simple, fast, safe and economical.