本文叙述一种分离微量钍的泡沫浮选法。在季胺盐氯化十四烷基二甲基苄基铵(作为阳离子表面活性剂)存在下,钍-偶氮胂Ⅲ络合物从0.3M 盐酸溶液中,浓集在浮渣内。研究了偶氮胂Ⅲ和氯化十四烷基二甲基苄基铵浓度,酸度和外来离子的影响。钍用偶氮胂Ⅲ分光光度法测定。在进行系统的浮选分离时,也研究了选定的裂变产物核素的性状。 This article describes a separation of trace amount of thorium froth flotation. In the presence of quaternary ammonium salt of tetradecyldimethylbenzylammonium chloride as a cationic surfactant, the thorium-arsenazo complex complex was concentrated in the scum from the 0.3M hydrochloric acid solution. The effects of arsenazo III and tetradecyldimethylbenzyl ammonium chloride concentration, acidity and extrinsic ions were studied. Thorium with arsenazo Ⅲ spectrophotometric determination. During the systematic flotation separation, the properties of selected fission product nuclides were also studied.