Extraction and separation of scandium(III) from concentrated sodium hydroxide solution using quaternary ammonium salt (Aliquat 336, CH₃R₃NOH) in kerosene as a diluent with 10% (v/v) octanol as a modifier were investigated. The parameters that affect the extraction process were separately studied. On the basis of the slope analysis method, the composition of the extracted species was proposed to be [CH₃R₃NSc(OH)₄]. The structure of the extracted metal species was supported by FT-IR investigations. Furthermore, the thermodynamic parameters related to the extraction process were estimated and the extraction process was found to be exothermic and spontaneous. The loading capacity of Aliquat 336 towards Sc(III) and stripping of loaded Sc(III) from the organic phase were also examined. Based on the acquired results, the method developed was applied for the recovery and separation of Sc(III) and other metal ions from a synthetic solution similar in composition to that expected from the leaching solution of red mud in strongly alkaline medium.

以季铵盐（Aliquat 336，CH ₃ R ₃ NOH）在煤油中作为稀释剂，以10％（v / v）辛醇为改性剂，从浓氢氧化钠溶液中萃取和分离of进行了研究。分别研究了影响萃取过程的参数。在斜率分析方法的基础上，提出了提取物的组成为[CH ₃ R ₃ NSc（OH）₄]。FT-IR研究支持了提取的金属物质的结构。此外，估计了与提取过程有关的热力学参数，发现提取过程是放热的和自发的。还研究了Aliquat 336对Sc（III）的负载能力以及从有机相中剥离的负载Sc（III）。根据获得的结果，所开发的方法适用于从合成溶液中回收和分离Sc（III）和其他金属离子，该合成溶液的组成与在强碱性介质中从红泥浸出溶液中预期的组成相似。