Sulfate minerals have gradually become the main gangue minerals of fluorite deposits, and the flotation separation of fluorite and sulfate minerals is difficult with commonly used depressants. In this paper, the high selectivity of a novel depressant sodium polynaphthalene formaldehyde sulfonate (SPS) for the flotation separation of fluorite and celestite both in single mineral and artificial mixed ore experiments was studied, and the underlying separation mechanism was investigated by zeta potential measurement, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) analysis, and Atomic force microscopy (AFM) imaging analysis. Flotation results showed that, in the presence of sodium oleate (NaOL) and SPS, the flotation recovery difference between fluorite and celestite reached 76.26% and the grade of fluorite concentrates increased by 32.11% at pH 6.0. The analysis results showed that the adsorption of SPS on the fluorite surface was limited at pH 6.0, and the adsorption was most likely be through electrostatic interaction. For celestite, the adsorption of SPS on the surface significantly changed the chemical surrounding of celestite surface inhibiting the chemical adsorption of NaOL, and the chemical adsorption of SPS was more significant at pH 6.0.

硫酸盐矿物逐渐成为萤石矿床的主要脉石矿物，萤石和硫酸盐矿物的浮选很难用常用的抑制剂进行浮选。本文研究了一种新型抑制剂聚萘甲醛磺酸钠（SPS）在单一矿物和人工混合矿实验中浮选分离萤石和天青石的高选择性，并通过zeta电位测量研究了潜在的分离机制，傅里叶变换红外光谱 (FTIR)、X 射线光电子能谱 (XPS) 分析和原子力显微镜 (AFM) 成像分析。浮选结果表明，在油酸钠(NaOL)和SPS存在下，萤石和天青石的浮选回收率差达到76。26%，萤石精矿品位在 pH 6.0 时增加 32.11%。分析结果表明，SPS 在萤石表面的吸附在 pH 6.0 时受到限制，吸附很可能是通过静电相互作用进行的。对于天青石，SPS在表面的吸附显着改变了天青石表面的化学环境，抑制了NaOL的化学吸附，在pH 6.0时SPS的化学吸附更为显着。