The efficient separation of fluorite and calcite is a challenging task in the field of mineral processing because of their similar chemical and physical properties. In this research, octylamino-bis-(butanohydroxamic acid) (OBHA) was introduced as collector into a flotation system comprising fluorite and calcite, and the separation of fluorite and calcite was realized in the absence of any depressants. ζ potential, FTIR, XPS measurements and DFT calculations were performed to investigate the mechanism for the selective adsorption of OBHA. The results indicate that the hydroxamic acid group of OBHA account for the adsorption process, and the adsorption of the hydroxamic acid group on fluorite was much stronger than that on calcite surface.

由于萤石和方解石具有相似的化学和物理性质，因此有效分离萤石和方解石是选矿领域的一项艰巨任务。本研究将辛氨基双(丁羟肟酸)(OBHA)作为捕收剂引入萤石和方解石组成的浮选体系中，在不添加任何抑制剂的情况下实现了萤石和方解石的分离。进行了 ζ 电位、FTIR、XPS 测量和 DFT 计算以研究 OBHA 的选择性吸附机制。结果表明，OBHA的异羟肟酸基团是吸附过程的原因，异羟肟酸基团对萤石的吸附远强于方解石表面的吸附。