Given the depletion of high-quality magnesite deposits and the rising demand for high-end magnesium materials, the separation and utilization of high-calcium magnesite ores have become essential. However, the similar surface properties and solubility of semi-soluble salt-type minerals, pose significant challenges for the utilization of dolomite-rich magnesite resources. In this study, 1-hydroxypropane-1,1-diphosphonic acid (HPDP) was identified for the first time as a high-performance depressant for dolomite. Various tests, including contact angle measurements, ζ potential analysis, X-ray photoelectron spectroscopy, and atomic force microscopy, were conducted to elucidate the interfacial interaction mechanisms of HPDP on the surfaces of the two minerals at different scales. Additionally, molecular modeling calculations were used to detail the spatial matching relationship between HPDP and the crystal faces of the two minerals. It was emphasized that HPDP specifically adsorbed onto the dolomite surface by forming calcium phosphonate, ensuring that the dolomite surface remained hydrophilic and sank. Moreover, it was found that the adsorption strength of HPDP on the mineral surfaces depended on the activity of the metal sites and their spatial distribution. These findings provide a theoretical foundation for the molecular design of flotation reagents for high-calcium magnesite ores.

中文翻译：

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双膦酸盐抑制剂1-羟基丙烷-1,1-二膦酸对富白云石菱镁矿浮选脱钙的影响及机理


随着优质菱镁矿资源的枯竭和高端镁材料需求的不断增长，高钙菱镁矿的分离和利用已变得至关重要。然而，半溶盐类矿物相似的表面性质和溶解度，给富含白云石的菱镁矿资源的利用带来了重大挑战。在这项研究中，首次鉴定出1-羟基丙烷-1,1-二膦酸（HPDP）是一种高性能的白云石抑制剂。进行了各种测试，包括接触角测量、ζ电位分析、X射线光电子能谱和原子力显微镜，以阐明不同尺度下HPDP在两种矿物表面上的界面相互作用机制。此外，还利用分子模型计算详细说明了HPDP与两种矿物晶面之间的空间匹配关系。强调HPDP通过形成膦酸钙特异性吸附在白云石表面，确保白云石表面保持亲水性并下沉。此外，我们发现HPDP在矿物表面的吸附强度取决于金属位点的活性及其空间分布。这些研究结果为高钙菱镁矿浮选药剂的分子设计提供了理论基础。