高岭土污水的磁絮凝沉降和影响因素研究
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摘要
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 m T,a size of magnetic particle seed of 10. 66 μm and an addition of magnetic seeds of 2 g. Under the conditions as mentioned above, the sedimentation rate of flocs is2. 675 cm/g with a height of sediment of being 2. 95 cm and a transmissibility of supernant reaching 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 m T,a size of magnetic particle seed of 10. 66 μm and an addition of magnetic seeds of 2 g. Under the conditions as mentioned above, the sedimentation rate of flocs is2. 675 cm/g with a height of sediment of being 2. 95 cm and a transmissibility of supernant reaching 93%.
引文
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[13]王文娟,张海鹏,韩玉香,等.磁性Fe3O4@Si O2@Zr O2对水中磷酸盐的吸附研究[J].无机化学学报,2014,30(12):2726-2732.
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[16]张志军,刘炯天,冯莉,等.基于DLVO理论的煤泥水体系的临界硬度计算[J].中国矿业大学学报,2014,43(1):120-125.
[17]孙华峰. DLVO理论在煤泥水絮凝机理中的应用分析[J].选煤技术,2013(1):39-41.
[2]刘令云,闵凡飞,张明旭,等.不同密度级原煤的泥化特性[J].煤炭学报,2012,37(S1):182-186.
[3]赵晴,闵凡飞,刘令云,等.原煤密度对泥化及煤泥颗粒表面电位的影响[J].煤炭科学技术,2011,39(6):115-118.
[4]王辉锋,赵龙,徐志强,等.高岭石对煤泥沉降影响的研究[J].选煤技术,2012(3):12-14,22.
[5]乔尚元,李建军,朱金波,等.煤泥水处理新技术及发展趋势[J].水处理技术,2016(6):8-11.
[6]董宪姝,姚素玲,刘爱荣,等.电化学处理煤泥水沉降特性的研究[J].中国矿业大学学报,2010,39(5):753-757.
[7] SABAH E,ERKAN Z E. Interaction mechanism of flocculants with coalwaste slurry[J]. Fuel,2006,85(3):350-359.
[8]朱书全,降林华,邹立.微细粒高浊度高泥化污水用絮凝剂的合成与应用[J].中国矿业大学学报,2009,38(4):534-539.
[9]冯秀娟,朱易春,阮强.脱稳和混凝法处理某多金属矿尾矿废水试验研究[J].矿冶工程,2008,28(4):47-50.
[10]冯秀娟,刘祖文,朱易春.混凝剂处理选矿废水的研究[J].矿冶工程,2005,25(4):27-29.
[11]黄启荣,霍槐槐.磁絮凝与磁分离技术的应用现状与前景[J].给水排水,2010,36(7):150-152.
[12]吕玉庭,赵丽颖,时起磊.磁场对煤泥水絮凝沉降效果的影响[J].黑龙江科技大学学报,2013,23(5):424-426.
[13]王文娟,张海鹏,韩玉香,等.磁性Fe3O4@Si O2@Zr O2对水中磷酸盐的吸附研究[J].无机化学学报,2014,30(12):2726-2732.
[14]张银燕,尹衍升,张金升,等.纳米Fe3O4磁性液体稳定性的研究[J].化学物理学报,2004,17(1):83-86.
[15] PAN J M,YAO H,LI X X,et al. Synthesis of chitosan/gamma-Fe2O3/fly-ash-cenospheres composites for the fast removal of bisphenol A and 2,4,6-trichlorophenol from aqueous solutions[J]. Journal of hazardous materials,2011,190(1-3):276-284.
[16]张志军,刘炯天,冯莉,等.基于DLVO理论的煤泥水体系的临界硬度计算[J].中国矿业大学学报,2014,43(1):120-125.
[17]孙华峰. DLVO理论在煤泥水絮凝机理中的应用分析[J].选煤技术,2013(1):39-41.