以某铅锌银矿全尾砂沉降试验为例,分析添加不同絮凝剂单耗时,全尾砂浆浑液面沉速的变化规律,旨在探究3个不同沉降阶段的机理.结果表明:随添加相对分子质量为8×106的阴离子聚丙烯酰胺(APAM)单耗的增加,1 min内全尾砂浆的浑液面沉速先增加后减小;在加速自由沉降段,游离的"细"颗粒尾砂及过多的絮团水影响了浑液面沉速;在干涉沉降段,空间位阻效应导致的尾砂颗粒间互相排斥降低了浑液面沉速;在压缩沉降段,孔隙水减少及絮团水增加改变界面沉速;絮凝剂单耗0、10、20、30和40 g/t分别表示无、低、合理、高和超量.
Taking sedimentation tests of all tailings of a Pb-Zn-Ag mine as an example, change laws of interface sedimentation velocity of added different unit consumptions of flocculants were analyzed, which was in order to explore mechanism of three different sedimentation periods. The results show that interface sedimentation velocity of unclassified tailings slurry firstly increases and then decreases in one minute, as the increase of added anionic polyacrylamide (APAM) whose relative molecular weight is 8×106. At the accelerating and free sedimentation period, interface sedimentation velocity is influenced by dissociative fine particle tailings and more flocculent water. At the interfering sedimentation period, interface sedimentation velocity is decreased by repulsive force between tailing particles, which is caused by steric effect. At the compressing sedimentation period, interface sedimentation velocity is changed by reducing void water and adding flocculent water. The unit consumptions of flocculants 0, 10, 20, 30 and 40 g/t, represent no, low, reasonable, high and excess, respectively.
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