高岭土污水的磁絮凝沉降和影响因素研究

Sedimentation of waste kaolin water through magnetic flocculation and study of its influence factors

为了增加煤泥水内絮团的沉降动力,以质量分数为4%的高岭土污水模拟煤泥水,以球磨后的粉煤灰磁珠作为磁种,并分别以PAM、CaCl2作为絮凝剂和凝聚剂,对其进行磁絮凝沉降处理;通过试验研究磁场强度、磁种用量和磁种粒径三个因素对磁絮凝沉降效果的影响规律,并确定磁絮凝沉降的最佳试验条件。试验结果表明:磁场强度、磁种用量、磁种粒径三个因素均对磁絮凝沉降效果具有显著影响;在PAM用量为0. 035 g/L、CaCl2用量为0. 003 mol/L、磁场强度为196 m T、磁种粒径为10. 66μm、磁种用量为2 g的条件下,高岭土污水的磁絮凝沉降效果最佳,磁絮团沉降速率为2. 675 cm/s,尾泥高度为2. 95 cm,上清液透光率达到93%。

In order to allow flocs in coal slurry water to settle with a higher dynamics,the Kaolin water containing 4%of Kaolin by weight is used as simulated coal slurry water,with is then treated through magnetic flocculation using ball-milled flyash magnetic beads as magnetic seeds and PAM and CaCl2 as flocculant and coagulant respectively.The study is made with an aim to make known the law governing the effect on sedimentation produced by each of the 3 factors-intensity of magnetic field,proportion and size of magnetic beads used,and to determine the optimum experimental conditions.As evidenced by test result,the above-cited 3 factors all exert an sign ficant influence in this regard,and a best sedimentation result can be expected with PAM and CaCl2 at dosages of 0.035 g/L and 0.003 mol/L respectively,an intensity of magnetic field of 196 mT,a size of magnetic particle seed of 10.66μm and an addition of magnetic seeds of 2 g.Under the conditions as mentioned above,the sedimentation rate of flocs is 2.675 cm/g with a height of sediment of being 2.95 cm and a transmissibility of supernant reaching 93%.