ABSTRACT

During the grinding of pyrite, the grinding medium affects the properties of the grinding products, which in turn affects its flotation performance. In this study, we investigated the effects of cast iron ball (CIB) and ceramic ball (CB) grinding media on the grinding products characteristics and flotation performance of pyrite using atomic absorption spectrometry, scanning electron microscopy combined with energy dispersive spectrometry, X-ray photoelectron spectroscopy, contact angle measurement, and single mineral flotation analysis. The results showed that the Fe³⁺ and SO₄^2- concentrations and pH value of the pulp were significantly lower in the case of grinding with the CB medium than with the CIB medium, whereas the dissolved oxygen content of the pulp was significantly higher. The surfaces of the pyrite samples produced by the CB grinding medium were relatively even and smooth with a small amount of formation and coverage of FeOOH as compared to those of the pyrite samples produced by the CIB grinding medium, resulting in a superior hydrophobicity and floatability. Resultantly, the pyrite samples obtained using the CB grinding medium exhibited better performance in flotation recovery than those obtained using the CIB grinding medium. The presence of ferric ions was adverse to pyrite flotation because of the formation of ferric hydroxyl complex. CB shows great potential to be used as grinding medium for pyrite.

摘要

在黄铁矿磨矿过程中，磨矿介质影响磨矿产品的性质，进而影响其浮选性能。在本研究中，我们采用原子吸收光谱法、扫描电子显微镜结合能谱分析法、X 射线光谱法研究了铸铁球 (CIB) 和陶瓷球 (CB) 磨矿介质对黄铁矿磨矿特性和浮选性能的影响。光电子能谱、接触角测量和单一矿物浮选分析。结果表明，Fe ³⁺和 SO ₄ ^2-CB 介质研磨时纸浆的浓度和 pH 值显着低于 CIB 介质，而纸浆的溶解氧含量则显着更高。与CIB研磨介质制备的黄铁矿样品相比，CB研磨介质制备的黄铁矿样品表面相对平整光滑，有少量FeOOH的形成和覆盖，具有优异的疏水性和可浮性。结果，使用CB磨矿介质获得的黄铁矿样品比使用CIB磨矿介质获得的黄铁矿样品表现出更好的浮选回收性能。由于三价铁羟基络合物的形成，三价铁离子的存在不利于黄铁矿浮选。CB 显示出用作黄铁矿研磨介质的巨大潜力。