磁化处理对微细粒赤铁矿絮凝的影响
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摘要
以赤铁矿纯矿物作为研究对象,通过沉降试验来考察不同方式的磁化处理作用对赤铁矿絮凝沉降行为的影响。结果表明:矿浆和药剂在经过磁化处理后,絮凝效果明显优于未经过磁化处理的絮凝效果,且磁场强度越高絮凝效果越好;在矿浆磁化和药剂磁化为60 min时赤铁矿沉降率达到最大值,分别为73.9%和72.7%,磁化矿浆比磁化药剂对赤铁矿絮凝的效果好;磁化矿浆和磁化药剂两种不同磁化处理方式下的赤铁矿颗粒Zeta电位测量结果表明,磁化处理会改变赤铁矿颗粒的Zeta电位,分别从-50.765 m V减小至-43.538 m V和-44.006 m V;磁化处理降低了赤铁矿颗粒间双电层排斥力,降低颗粒间的势能垒,使赤铁矿颗粒更易于聚团,絮凝效果增强;赤铁矿与淀粉红外光谱研究结果表明,赤铁矿与淀粉分子间存在着化学吸附和氢键作用。
Taking pure hematite minerals as the research object,the sedimentation test was conducted to investigate the influence of magnetization treatment on flocculation sedimentation of hematite. The results showed that the flocculation performance of the treated pulp and reagent with magnetization was obviously better than that of the non-magnetized pulp,which was also increased with magnetic field strength. When the magnetization time of the slurry and the magnetization of the agent was 60 min,the hematite sedimentation rate reached the maximum at 73. 9% and 72. 7%,respectively,which indicated the effect of magnetized slurry on the flocculation of hematite was more obvious that of magnetized reagent. The results of Zeta potential measurements showed that magnetized pulp and magnetized reagent changed the Zeta potential of hematite from-50. 765 m V to-43. 538 m V and-44. 006 m V,respectively. Magnetization reduced the repulsive force of the electric double layer between the hematite particles and reduced the potential barrier between the particles,making the hematite particles more agglomerated and enhancing flocculation performance. Results of hematite and starch infrared spectroscopy demonstrated that there are chemical adsorption and hydrogen bonding between hematite and starch molecules.
Taking pure hematite minerals as the research object,the sedimentation test was conducted to investigate the influence of magnetization treatment on flocculation sedimentation of hematite. The results showed that the flocculation performance of the treated pulp and reagent with magnetization was obviously better than that of the non-magnetized pulp,which was also increased with magnetic field strength. When the magnetization time of the slurry and the magnetization of the agent was 60 min,the hematite sedimentation rate reached the maximum at 73. 9% and 72. 7%,respectively,which indicated the effect of magnetized slurry on the flocculation of hematite was more obvious that of magnetized reagent. The results of Zeta potential measurements showed that magnetized pulp and magnetized reagent changed the Zeta potential of hematite from-50. 765 m V to-43. 538 m V and-44. 006 m V,respectively. Magnetization reduced the repulsive force of the electric double layer between the hematite particles and reduced the potential barrier between the particles,making the hematite particles more agglomerated and enhancing flocculation performance. Results of hematite and starch infrared spectroscopy demonstrated that there are chemical adsorption and hydrogen bonding between hematite and starch molecules.
引文
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[4]Balanda M,Kope M.Magnetic treatment of industrial water.silica activation[J].European Physical Journal Applied Physics,2002,18(18):41-49.
[5]Surendran U,Sandeep O,Joseph E J,et al.The impacts of magnetic treatment of irrigation water on plant,water and soil characteristics[J].Agricultural Water Management,2016,178:21-29.
[6]Mahmoud B,Yosra M,Nadia A.Effects of magnetic treatment on scaling power of hard waters[J].Separation&Purification Technology,2016,171:88-92.
[7]Pang X F,Deng B.The changes of macroscopic features and microscopic structures of water under influence of magnetic field[J].Physica B Condensed Matter,2008,403(19-20):3571-3577.
[8]Pang X F.Investigation of changes in properties of water under the action of a magnetic field[J].Science China Physics,Mechanics&Astronomy,2008,51(11):1621-1632.
[9]Pang X,Deng B.Investigation of magnetic-field effects on water[C]//International Conference on Applied Superconductivity and Electromagnetic Devices.Chengdu:IEEE,2009:278-283.
[10]李建军,乔尚元,朱金波,等.煤泥水磁化改性及磁化—絮凝沉降研究[J].洁净煤技术,2015(4):1-4.
[11]周亮.淀粉对微细粒赤铁矿絮凝行为及机理研究[D].武汉:武汉科技大学,2015.
[12]朱巨建.水的磁化处理对赤铁矿、石英浮选性能影响的研究[D].沈阳:东北大学,1999:81-82.
[13]A.A.索科洛夫,王祖望.量子力学原理及其应用[M].上海:上海科学技术出版社,1988.
[14]彭陈亮,闵凡飞,赵晴,等.微细矿物颗粒表面水化膜研究现状及进展综述[J].矿物学报,2012,32(4):515-522.
[15]Kar B,Sahoo H,Rath S S,et al.Investigations on different starches as depressants for iron ore flotation[J].Minerals Engineering,2013,49(8):1-6.