Talc is a gangue mineral of many sulfide minerals, which is naturally hydrophobic. The depression of talc is very important and challenging in sulfide ore flotation. This research introduced aluminum ions into the process of using carboxymethyl cellulose (CMC) to depress talc. Flotation experiment results showed that aluminum ions used alone exerted a weak depression effect on talc, and that aluminum ions used in conjunction with CMC effectively depressed the flotation of talc at pH 8.5. Results of X-ray photoelectron spectroscopy and adsorption tests showed that the interaction of aluminum ions with talc changed the surface of talc, and Al(OH)₃ formed on the talc surfaces, thereby promoting the adsorption of CMC onto talc and depressing the flotation of talc. On this basis, the morphology of CMC on the talc surface was observed by atomic force microscopy imaging. With the addition of aluminum ions, CMC aggregated to a greater extent, multiple layers adsorbed onto the surface of talc, and the coverage of CMC substantially increased. Based on all tests and analysis, the mechanism of the synergistic effect of CMC and aluminum ions on talc flotation was also proposed.

滑石是许多硫化物矿物的脉石矿物，天然疏水。滑石的凹陷在硫化矿浮选中非常重要且具有挑战性。本研究将铝离子引入到使用羧甲基纤维素 (CMC) 来抑制滑石粉的过程中。浮选实验结果表明，单独使用铝离子对滑石粉的抑制作用较弱，而铝离子与CMC配合使用，在pH 8.5时有效抑制滑石粉的浮选。X射线光电子能谱和吸附试验结果表明，铝离子与滑石粉的相互作用改变了滑石粉的表面，Al(OH) ₃在滑石表面形成CMC，从而促进CMC在滑石上的吸附，抑制滑石的浮选。在此基础上，通过原子力显微镜成像观察了滑石表面CMC的形貌。随着铝离子的加入，CMC的聚集程度更大，滑石表面吸附了多层，CMC的覆盖率大幅增加。在所有试验和分析的基础上，还提出了CMC与铝离子协同作用对滑石浮选的作用机理。