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- 2017
颗粒性质对弱磁选铁精矿过滤性能的影响
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Abstract:
针对焙烧-弱磁选铁精矿过滤速率慢、滤饼水分高等问题, 分析了颗粒性质对过滤速率和滤饼含水率的影响机理, 从改善颗粒细化问题与固液交互作用力角度着手, 添加不同的絮凝剂、表面活性剂及其复合来改善过滤性能．采用改进的真空过滤实验装置, 验证了不同类型的化学助滤剂对精矿过滤性能的作用效果及其作用机理．实验结果表明, 有机高分子絮凝剂通过吸附架桥使细颗粒形成絮团, 增强滤饼渗透率, 解决了粒度细的问题, 从而提高过滤速率; 表面活性剂通过降低气液表面张力和颗粒润湿性, 降低毛细管压力, 改善了界面性能, 从而降低滤饼含水率; 絮凝剂与表面活性剂适当复合, 既能提高过滤速率, 又能使滤饼含水率有一定的降低．
On account of the low filtration rate and high cake moisture of roasting-low intensity magnetic separation iron concentrates，the influence mechanism of particle properties on filtration rate and cake moisture was analyzed，and various flocculants，surfactants and their complexes were adopted to improve the filterability from the perspectives of improving particle refinement and solid-liquid interaction forces. The effect and mechanism of different kinds of chemical filter aids on the filterability of iron concentrates were verified by using a modified bench-scale vacuum filtration device. The experimental results show that organic polymer flocculants enhance the permeability of filter cakes by forcing the fine particles to form flocs by adsorption and bridging，thus solving the problem of fine size and therefore increasing filtration rate. Surfactants are able to decrease the capillary pressure by decreasing the air/water surface tension and the wettability of particles，thus improving the interfacial properties and reducing cake moisture. With the compounding use of flocculants and surfactants，higher filtration rate and lower cake moisture can be obtained
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