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本文研究了以仲辛醇为添加剂,煤油为稀释剂的硝酸甲基三烷基铵和硫氰酸甲基三烷基铵萃取稀土的分配比随镧系元素原子序数的变化趋势及其萃合物的远红外光谱。在硝酸体系中萃合物(R_3CH_3N)_3[Ln(NO_3)_6]的Ln-O键的振动频率:从La到Nd为191～192cm~(-1),近于常数;由Nd到Sm突然上升到221cm~(-1);而由Sm到Lu又趋于常数。在硫氰酸体系中萃合物(R_3~((?))CH_3N)_3[Ln(CNS)_6]的Ln-N键的振动频率:从La到Er为189～201cm~(-1),变化缓慢;由Er到Tm突然上升到220cm~(-1);从Tm到Lu又变化缓慢。在硝酸体系中Y-O键和硫氰酸体系中Y-N键的振动频率均高于镧系元素。硫氰酸体系中Ln-N键的振动峰积分强度及吸收度均比硝酸体系中对应元素的Ln-O键的大。
In this paper, the distribution ratio of rare earth extracted by methyltriammonium nitrate and trimethylammonium methylnitrite with octanol as additive and kerosene as diluent with the change trend of atomic numbers of lanthanides and its extraction Far-infrared spectroscopy. The vibrational frequencies of the Ln-O bonds of the complex (R_3CH_3N) _3 [Ln (NO_3) _6] in the nitric acid system range from 191 to 192 cm -1 from La to Nd, which is almost constant. From Nd to Sm suddenly Rose to 221cm ~ (-1); and from Sm to Lu and tends to constant. The vibrational frequencies of the Ln-N bonds of the complex (R_3 ~ ((?)) CH_3N) _3 [Ln (CNS) _6] in the thiocyanate system are 189 ~ 201cm -1 from La to Er, Change slowly; from Er to Tm suddenly rose to 220cm ~ (-1); from Tm to Lu and change slowly. In the nitric acid system, the vibrational frequencies of Y-N bond in Y-O bond and thiocyanate system are higher than that of lanthanide. The integral peak intensity and absorption of Ln-N bond in thiocyanate system are larger than that of Ln-O bond in the corresponding nitric acid system.