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为解决司家营铁矿超大规模超细泥化全尾砂浆体沉降速度慢、溢流水浑浊、絮凝剂单耗高等问题,基于新型磁化助凝剂,进行了室内超细泥化全尾砂动态絮凝沉降实验。为获得各影响因子(磁场强度、助凝剂单耗、絮凝剂单耗和供料速度)作用下最小的溢流水浊度,基于响应面分析法,进行了四因素五水平的中心组合实验设计。采用电位分析和电镜扫描等方法分析了助凝剂和絮凝剂的协同作用机理。结果表明:在磁场强度为0.3 T,助凝剂单耗为200 mL/t,絮凝剂单耗为30 g/t,供料速度为0.6 t/(m~2·h)时,絮凝剂单耗、溢流水浊度和含固量分别降低约50%、90%和80%;深锥单位面积处理能力、充填和干排效率分别提升约20%、17%和13%。新型磁化絮凝剂经济环保,在实现司家营铁矿7000万吨超细全尾砂浆体安全高效处置的基础上,可节约经济成本5300万元,在国内外矿山具有巨大的推广应用价值。
In order to solve the problem of slow sedimentation speed, turbidity of overflowing water and high unit consumption of flocculants in the ultra-large-scale ultra-fine muddy tailing slurry of Sijiaying Iron Mine, based on the new magnetizing coagulant, Flocculation settling experiment. In order to obtain the minimum overflow turbidity under the influence of various factors (magnetic field strength, unit consumption of coagulant aid, flocculant consumption and feed rate), a four-factor-five central composite design was carried out based on response surface analysis . Potential analysis and scanning electron microscopy were used to analyze the synergistic mechanism of coagulant and flocculant. The results show that when the magnetic field strength is 0.3 T, the coagulant unit consumption is 200 mL / t, the flocculant unit consumption is 30 g / t, and the feed rate is 0.6 t / (m ~ 2 · h) The turbidity and solids content of the overflow, overflow, and solids decreased by about 50%, 90% and 80% respectively. The processing efficiency per unit area of the deep cone, filling and drying efficiency were increased by about 20%, 17% and 13% respectively. New magnetic flocculant economic and environmental protection, in achieving the Secretary for iron ore 70 million tons of ultra-fine tailings slurry safe and efficient disposal based on the economic cost savings of 53 million yuan, at home and abroad have a huge promotional value of the mine.