Acid surface pretreatment was employed to realize the selective hydrophobic agglomeration of micro-fine ilmenite in flotation. Microflotation and artificially mixed mineral experiments manifested that after acid surface pretreatment, the recovery of micro-fine ilmenite with the increase of NaOL concentration and the floatability difference of micro-fine ilmenite and titanaugite increased significantly. Zeta potential and contact angle analyses suggested that acid surface pretreatment intensified the adsorption of NaOL on ilmenite surfaces while reducing it on titanaugite surfaces. Turbidity, optical microscope, and EDLVO theory analyses attested that the hydrophobic attraction dominated in a short particle spacing in NaOL solution. Following acid surface pretreatment, the hydrophobic agglomeration between micro-fine ilmenite particles enhanced in NaOL solution due to increased hydrophobic attraction. In contrast, the hydrophobic attraction and agglomeration between micro-fine titanaugite particles as well as between micro-fine ilmenite and titanaugite particles weakened. Overall, acid surface pretreatment improved the selective adsorption of NaOL and the selective hydrophobic agglomeration of micro-fine ilmenite, resulting in enhanced separation efficiency and recovery of micro-fine ilmenite.

中文翻译：

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酸表面预处理对浮选中微细钛铁矿和钛矿疏水团聚的影响


采用酸性表面预处理实现微细钛铁矿在浮选中的选择性疏水团聚。微浮选和人工混合矿物实验表明，经过酸性表面预处理后，随着NaOL浓度的增加，微细钛铁矿的回收率以及微细钛铁矿和钛铁矿的可浮性差异显著增加。Zeta 电位和接触角分析表明，酸表面预处理加强了 NaOL 在钛铁矿表面的吸附，同时降低了 NaOL 在钛晶石表面上的吸附。浊度、光学显微镜和 EDLVO 理论分析证明，在 NaOL 溶液中，疏水吸引力在短颗粒间距中占主导地位。在酸表面预处理后，由于疏水吸引力增加，微细钛铁矿颗粒之间的疏水团聚在 NaOL 溶液中增强。相比之下，微细钛矿颗粒之间以及微细钛铁矿和钛钛矿颗粒之间的疏水吸引力和团聚作用减弱。总体而言，酸性表面预处理改善了 NaOL 的选择性吸附和微细钛铁矿的选择性疏水团聚，从而提高了微细钛铁矿的分离效率和回收率。