This study presents a systematic summary on the depressing effect of polysaccharides on some polar minerals, revealing that the order of their depressing strength on some polar minerals was primarily associated with the surface properties of the minerals, showing a limited correlation with the structure of polysaccharides. Subsequently, the selective depressing mechanism of polysaccharides on polar minerals was quantitatively explained from the perspective of acid–base interaction mechanism, and a criterion system for determining the depressing effect of polysaccharide on minerals was proposed. Specifically, it was found that the hydroxylation reaction of metal sites on mineral surface was a prerequisite for polysaccharide adsorption. Under the above–mentioned conditions, the selective depressing effect of polysaccharides on these minerals with different metal sites could be assessed through a parameter system in which the ion potential φ of surface metal sites served as the primary determinant, and the solubility product constant of metal hydroxides played a secondary role. In cases where minerals shared identical surface metal sites, the selective depressing effect of polysaccharides was analyzed by comparing the coordination numbers of these sites. Specifically, minerals with a higher number of coordinated surface metal sites tend to show a weaker response to depressing effect of polysaccharide. Consequently, this study theoretically elucidated the selective depressing effect of polysaccharides on polar minerals, and the criterion system proposed in this study outperforms the prediction results based on the isoelectric point (pHiep). These research findings have important guiding significance for a deeper understanding of the selective depressing mechanism of polysaccharides and the regulation of flotation.

中文翻译：

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多糖对部分极性矿物质选择性抑制作用的定量研究


本研究系统总结了多糖对部分极性矿物的抑制作用，揭示了多糖对部分极性矿物的抑制作用强弱顺序主要与矿物的表面性质有关，与多糖的结构相关性有限。随后，从酸碱相互作用机制的角度定量解释了多糖对极性矿物质的选择性抑制机制，并提出了判断多糖对矿物质抑制作用的标准体系。具体而言，发现矿物表面金属位点的羟基化反应是多糖吸附的先决条件。在上述条件下，多糖对这些具有不同金属位点的矿物的选择性抑制作用可以通过以表面金属位点的离子势φ为主要决定因素、金属的溶度积常数为参数体系来评估。氢氧化物起次要作用。在矿物质共享相同表面金属位点的情况下，通过比较这些位点的配位数来分析多糖的选择性抑制作用。具体而言，具有较多配位表面金属位点的矿物质往往对多糖的抑制作用表现出较弱的反应。因此，本研究从理论上阐明了多糖对极性矿物质的选择性抑制作用，并且本研究提出的判据体系优于基于等电点（pHiep）的预测结果。 这些研究结果对于深入了解多糖的选择性抑制机制和浮选调控具有重要的指导意义。