The present study aims to investigate the optimum parameter in producing high-purity thorium dioxide (ThO₂) using Di-2-ethylhexyl phosphoric acid (D₂EHPA) and Aliquat-336 as solvent materials. The extraction and purification process was performed using [Th-RE](OH)₄ compound which was selectively precipitated from the monazite leach solution. Several parameters such as types of acid (HCl, HNO₃ and H₂(SO₄)), acid molarity (1M–6M), and solvent ratio (10%–30%) were investigated. The findings indicate that different solvents require a distinctive aqueous medium to extract thorium. The optimum concentrations of D₂EHPA and Aliquat-336 in extracting thorium were identified to be at 1M H₂(SO₄) and 4M HNO₃ with 30% and 20% ratio, respectively. The multi-stage extraction process was successfully extracted and purified thorium at a purity of 96.8% (D₂EHPA) and 98.0% (Aliquat-336). Subsequent conversion to ThO₂ yielded a high-purity thorium dioxide at 99.1%. In general, the study elucidates that both solvents have the potential to be utilized as thorium extracting agents in preference to the conventional tri-butyl phosphate (TBP).

本研究旨在研究使用二-2-乙基己基磷酸（D ₂ EHPA）和Aliquat-336作为溶剂材料生产高纯度二氧化or（ThO ₂）的最佳参数。使用从独居石浸出溶液中选择性沉淀的[Th-RE]（OH）₄化合物进行提取和纯化过程。研究了几种参数，例如酸的类型（HCl，HNO ₃和H ₂（SO ₄）），酸摩尔浓度（1M–6M）和溶剂比率（10％–30％）。研究结果表明，不同的溶剂需要独特的水性介质来萃取or。D ₂的最佳浓度提取th中的EHPA和Aliquat-336分别位于1M H ₂（SO ₄）和4M HNO _3处，比率分别为30％和20％。多级萃取过程已成功地提取并纯化了th，纯度为96.8％（D ₂ EHPA）和98.0％（Aliquat-336）。随后转化为ThO ₂产生了99.1％的高纯度二氧化th。通常，该研究阐明了这两种溶剂均具有优先于常规磷酸三丁酯（TBP）用作th提取剂的潜力。