| 赤铁矿的自载体作用及对浮选的影响 |
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| 作者姓名： | 李东 印万忠 孙春宝 张瑞洋 |
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| 作者单位： | 1.北京科技大学土木与资源工程学院，北京 100083 |
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| 基金项目： | 国家自然科学基金资助项目（51904020）；中国博士后科学基金资助项目（2019M660466）；中央高校基本科研业务费资助项目（FRF-TP-18-082A1） |
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| 摘 要： | 通过单矿物浮选试验、光学显微镜分析、E-DLVO理论计算、团聚动力学分析等研究了油酸钠浮选体系下赤铁矿浮选过程中的自载体作用。单矿物浮选试验表明，粗粒赤铁矿（?106 + 45 μm）的可浮性较好，当油酸钠用量超过15 mg·L?1时，回收率可达到90%以上，而细粒赤铁矿（?18 μm）的浮选回收率、浮选速率则较低；当粗?细赤铁矿中粗粒和细粒的质量近似相等时，粗粒的“自载体”效果最强，浮选回收率增加的也最明显，但粗粒过量则会导致粗粒对细粒赤铁矿浮选的强化作用减弱。光学显微镜分析和E-DLVO理论计算表明，粗?细赤铁矿颗粒间的相互作用能高于细粒赤铁矿间的相互作用能，与细粒赤铁矿相比，粗?细赤铁矿间更容易发生团聚，这也是粗粒能够强化细粒赤铁矿浮选（自载体作用）的主要原因。但过量的粗粒赤铁矿会增强其浮选过程中的“磨削、剪切”作用，导致粗粒的“自载体”效果减弱，浮选回收率降低。
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| 关 键 词： | 赤铁矿 浮选 微细粒 自载体作用 E-DLVO理论 |
| 收稿时间： | 2018-11-05 |
The self-carrier effect of hematite in the flotation |
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| Affiliation: | 1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China2.School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China |
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| Abstract: | Finely disseminated iron ores are a type of refractory iron ores that exist in many regions in China, where fine grind is essential to liberate iron minerals from gangue. The flotation process of fine particles is plagued with losses of recovery and selectivity, which are due to the low collision efficiencies of fine particles with bubbles, mechanical/hydraulic entrainment, and high specific surface area. Carrier flotation, which is based on the carrier effect of coarse particles, is one of the effective methods for fine particle flotation. However, scarce information is available in the literature with regard to the " self-carrier” effect and mechanism of coarse hematite particles during flotation, which are necessary and beneficial for the efficient utilization of refractory iron ore resources. In this paper, micro-flotation test, optical microscopy analysis, E-DLVO theory calculations, and particle aggregation kinetics were used to study the self-carrier effect of hematite flotation in the sodium oleate system. Flotation results show that the recovery of coarse hematite (?106 + 45 μm) could be up to 90% when the sodium oleate concentration is over 15 mg·L?1. However, for fine hematite (?18 μm) particles, the flotation recovery and flotation rate are relatively low. The highest recovery of fine-coarse hematite mixtures is obtained when the fine and coarse hematite are approximately equal in mass ratio, thereby indicating that the self-carrier effects are strongest; meanwhile, the improvement of coarse particles for flotation recovery gradually weakens with excessive coarseness in the mixtures. Optical microscopy analysis and E-DLVO theory calculations show that the interaction energies and aggregation tendencies between fine and coarse hematite particles are stronger than those among the fine hematite particles, which might be the main reasons that coarse particles could enhance the flotation performance of fine hematite particles. However, excessive coarse particles could strengthen the grinding/attrition effects during the flotation, thereby possibly weakening the self-carrier effects of coarse particles and resulting in decreased flotation recovery. |
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