Chelating surfactants bearing hydroxyaminocarbonyl and amino groups (RnAHx) and cotelomer-type surfactants bearing hydroxyaminocarbonyl and pyridyl groups (Ls–VP–Q–Hx) were prepared and applied as flotation collectors for a trace amount of uranium. The uranium in an aqueous solution of pH 4–8 and in seawater was floated more effectively by ion flotation using RnAHx or by foam fractionation using Ls–VP–Q–Hx, compared with alkylhydroxamic acid (RnHx) and telomers bearing hydroxyaminocarbonyl groups (Lo–Hx). The effective flotation was concluded to be due to the chelate effects between the two groups on the complex formation and to the HLB of the resulting complex. Furthermore, the uranium recoveries were examined by using a hydroxamic acid polymer (62Hx), a N-methylhydroxamic acid telomer (Ls5.6MHx), and its cotelomer (Ls3.2VP4.5MHx).
制备了含羟基
氨基羰基和
氨基的螯合表面活性剂(RnAHx)和含羟基
氨基羰基和
吡啶基的共聚物型表面活性剂(Ls-VP-Q-Hx),并将其用作痕量
铀的浮选捕集剂。与烷基羟
肟酸(RnHx)和含羟基
氨基羰基的端聚物(Lo-Hx)相比,使用 RnAHx 进行离子浮选或使用 Ls-VP-Q-Hx 进行泡沫分馏能更有效地浮选 pH 值为 4-8 的
水溶液和海
水中的
铀。浮选效果显著的原因是这两种基团对络合物形成的螯合作用以及所形成络合物的 HLB。此外,还使用羟
肟酸聚合物(62Hx)、N-甲基羟
肟酸端聚体(Ls5.6
MHx)及其共端聚体(Ls3.2VP4.5
MHx)对
铀回收率进行了研究。