复配捕收剂从白云石中选择性浮选菱锌矿

摘要

A novel mixed collector (BHOA) was prepared by mixing benzohydroxamic acid (BHA) and sodium oleate (NaOL) and applied to the flotation separation of smithsonite from dolomite. Flotation results showed that NaOL alone had good collecting performance on smithsonite and common gangue mineral dolomite but had poor selectivity. By using a BHA/NaOL mixed system with a molar ratio of 2:1, the recoveries of smithsonite and dolomite reached approximately 90％ and 5％, respectively. Surface tension analysis showed that the surface activity of BHOA was a little higher than that of a single NaOL because of synergistic effects. Zeta potential and X-ray photoelectron spectroscopy measurements indicated that surfactants BHA and NaOL co-absorbed on the smithsonite surface and only NaOL was present on the dolomite surface in the presence of BHOA.%将苯甲羟肟酸(BHA)与油酸钠(NaOL)混合,制备一种新的复配捕收剂(BHOA),并将其应用于从白云石中浮选分离菱锌矿.浮选结果表明,单独使用油酸钠对菱锌矿和白云石均有较好的捕收性能,但选择性较差.在BHA/NaOL摩尔比为2:1的复配体系中,菱锌矿与白云石的回收率分别为90％和5％左右.表面张力分析表明,由于协同效应,复配捕收剂BHOA的表面活性高于单一油酸钠.Zeta电位和XPS测量结果显示,在复配捕收剂BHOA存在的情况下,BHA与NaOL在菱锌矿表面发生共吸附,白云石表面仅观察到油酸钠.