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研究了以甲苯作溶剂， Ｈ Ｂ Ｍ Ｐ Ｐ Ｔ（４苯甲酰基２，４ 二氢５甲基２苯基３ Ｈ吡唑硫酮３） Ｐ Ｓ Ｏ（石油亚砜）在硝酸介质中对铀（Ⅵ）、钍（Ⅳ）的萃取行为以及萃取剂浓度、酸度等各种因素对萃取分配比的影响，以确定 ２ 个萃取剂的协同萃取及分离效果。结果表明， Ｈ Ｂ Ｍ Ｐ Ｐ Ｔ 和 Ｐ Ｓ Ｏ 对铀（Ⅵ）有较好的协同萃取效果，一定条件下，该体系对铀（Ⅵ）、钍（Ⅳ）的分离系数可达 １０００ 左右。
Studied using toluene as solvent, H B M P P T (4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3 H-pyrazole thione 3) P S O (Petroleum sulfoxide) in the nitric acid medium on the uranium (Ⅵ), thorium (Ⅳ) extraction behavior and the extractant concentration, acidity and other factors on the extraction and distribution ratio to determine the extraction of two extraction agent and separation effect. The results show that H B M P P and P S O have good synergistic extraction effects on uranium (Ⅵ). Under certain conditions, the separation factor of uranium (Ⅵ) and thorium (Ⅳ) can reach about 1000.