This paper systematically studied the effect of lead ions on floatability of scheelite under sodium oleate (NaOL) system, and the deep adsorption mechanism was revealed by a series of mechanism experiments and the adsorption morphology of NaOL was observed by atomic force microscope (AFM). Micro-flotation test indicated that the floatability of scheelite increased sharply from 47.25% to 80.12% in the presence of lead ions at pH 7. Zeta potential results revealed the positively charged lead ions species (Pb²⁺ and PbOH⁺) positively changed the zeta potential of scheelite, which favored the adsorption of negatively charged NaOL species (RCOO⁻, RCOOH·RCOO⁻ etc.). XPS and FTIR analysis confirmed that NaOL was chemisorbed on scheelite surface and the adsorption was more severe in the presence of lead ions. Lead ions were chemisorbed on scheelite surface in the form of W-O-Pb²⁺, which facilitated the further adsorption of NaOL. This increased the active sites on scheelite surface for NaOL adsorption. AFM images intuitively showed the presence of lead ions increased the adsorption coverage of NaOL but did not affect the thickness of the adsorption layer. The adsorption thickness was still 6 nm–7 nm and the adsorption was multilayer adsorption. Based on these studies, an adsorption model was finally obtained.

本文系统研究了铅对油酸钠（NaOL）体系下白钨矿浮性的影响，通过一系列机理实验揭示了其深层吸附机理，并通过原子力显微镜（AFM）观察了NaOL的吸附形态。微浮选试验表明，白钨矿的可浮性急剧从47.25％的铅离子的存在下，在pH值提高到80.12％7. Zeta电位结果表明带正电的铅离子物种（铅²⁺和PBOH ⁺）正改变ζ电白钨矿的潜力，这有利于负电荷的油酸钠物种（RCOO的吸附^-，RCOOH·RCOO ^-ETC。）。XPS和FTIR分析证实NaOL被化学吸附在白钨石表面，并且在存在铅离子的情况下吸附更为严重。铅离子以WO-Pb ²⁺的形式化学吸附在白钨矿表面，促进了NaOL的进一步吸附。这增加了白蜡石表面上用于NaOL吸附的活性位点。AFM图像直观地表明，铅离子的存在增加了NaOL的吸附范围，但不影响吸附层的厚度。吸附厚度仍为6 nm–7 nm，吸附为多层吸附。基于这些研究，最终获得了吸附模型。