The flotation separation of fine minerals, including rutile, has long been a challenging research focus. This study selected rutile and garnet samples with size fractions of −15, −38, and −74 μm to investigate the impact of particle size on flotation separation. Infrared spectroscopy, Zeta potential analysis, adsorption capacity measurements, and high-speed camera were utilized to analyze the mechanism. Results indicate that a high-grade concentrate with recovery of 92.33 % was achieved by mixing −74 μm rutile and −15 μm garnet in a 1:1 ratio. Benzohydroxamic acid (BHA) collector primarily chemisorbs onto the surface of rutile particles. BHA's adsorption capacity on each particle size's rutile surface is significantly higher than that of garnet. Meanwhile, sodium fluorosilicate (SSF) exhibits the strongest inhibitory effect on −15 μm garnet particles. Additionally, adhesion between bubbles and −74 μm rutile is much stronger than that between bubbles and fine particles overall. These findings have significant reference value for improving eclogite-type rutile ore's fine particle separation.

中文翻译：

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不同粒度级分对石榴石中细粒金红石浮选分离的影响

包括金红石在内的细粒矿物的浮选分离长期以来一直是一个具有挑战性的研究热点。本研究选择了粒度分数为-15、-38 和-74 μm 的金红石和石榴石样品，以研究粒度对浮选分离的影响。利用红外光谱、Zeta 电位分析、吸附容量测量和高速相机来分析其机理。结果表明，-74 μm 金红石和-15 μm 石榴石以 1:1 的比例混合，获得了回收率为 92.33% 的高品位精矿。苯甲羟肟酸（BHA）捕收剂主要化学吸附在金红石颗粒的表面上。 BHA在各粒径金红石表面的吸附能力均明显高于石榴石。同时，氟硅酸钠（SSF）对-15μm石榴石颗粒表现出最强的抑制作用。此外，气泡与-74μm金红石之间的粘附总体上比气泡与细颗粒之间的粘附强得多。这些研究结果对于提高榴辉岩型金红石矿石的细粒分选具有重要的参考价值。