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The adsorption of Cu2+ on kaolinite under magnetic field was studied at 25℃.The magnetic effects were investigated by designing the variation of exposure time,magnetic flux density and the method of magnetic exposure.The results from these study show that the magnetic treatment significantly enhance the fraction of adsorption of Cu2+,the adsorption of Cu2+ by kaolinite increases with the increase of pH value from 2 to 6.Both the magnetic exposure time and the magnetic flux density promote the fraction of adsorption Cu2+ on kaolinite.