With the micro-fine tailings in which the particle content of -20μm accounted for 90% as test object ,the impact of the molecular weight and dosage of non-ionic flocculant on the settling performance of micro-fine tailings was studied .The results showed that with the increase in molecular of non-ionic flocculant ,the settling velocity of tailings increased and the concentration of compression zone decreased . The affect of the flocculant dosage on the settlement of fine tailings is phased :at low dosage ,the sedimentation rate is slow and the amplification is little ;at moderate dosage ,the sedimentation rate is fast and the amplification is large ;at higher dosage ,the sedimentation rate is basically stable and there is no significant increase ;the concentrations of compression zone are decreased at first two stages and finally stable .When flocculant selection to be N1500 and the dose is 200g/t ,a better settlement results of 5 .46cm/min sedimentation rate and 38 .46% compression zone concentration can be obtained .%以d90约为20μm的微细粒难沉降尾矿为试验对象,研究了非离子型絮凝剂的分子量和用量对微细粒尾矿沉降性能的影响.结果表明:随着非离子型絮凝剂分子量的增加,尾矿的沉降速度逐渐增加,压缩区浓度有所下降;絮凝剂的用量对细粒尾矿絮凝沉降的作用是分阶段的,用量较低时,沉降速度慢且涨幅小,用量适中时,沉降速度大且涨幅较大,用量较高时,沉降速度基本稳定,没有大幅度增长;而压缩区浓度在前两个阶段都是逐渐降低,最后也基本稳定.选用N1500絮凝剂,用量为200g/t时,可以获得较好的沉降效果,沉降速度为5.46cm/min,压缩区浓度为38.46%.
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