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Effects of Imogoliteon on Colloidal Stability of Montmorillonite and Kaolinite

MA Yulu;WANG Xiuzhen;MA Yuzhuang;HOU Mihong;FAN Fu;XU Shoujun;College of Agriculture,Inner Mongolia University for Nationalities;Inner Mongolia Tongliao Vocational College;  
[Objective]Exploring the influence of imogolite on the dispersion and coagulation characteristics of montmorillonite and kaolinite,to provide a theoretical basis for soil and water conservation and environmental protection work.[Methods]Montmorillonite and kaolinite solutions were respectively mixed with a certain proportion of imogolite solution.After that,turbidimetric method and ion exchange method were used for the measurements of the dispersion of clay and charge characteristics of clay;and electronic microscope was used to observe the effect of imogolite on the dispersion flocculation characteristics of montmorillonite and kaolinite.[Results]The mixture kept coagulated in any pH value when imogolite and montmorillonite was mixed in a of proportion of 1∶1;solution of Kaolin without iron removal processing was observed agglomerated when pH value was below 5.9 but dispersed when pH value was more than 6.0.The aggregation characteristics of kaolin without iron removal processing reversed when about 5% of imogolite was added.[Conclusion]From the microscopic point of view,imogolite mixed solution was in coagulated state whether in acidic or alkaline condition.When the solution of imogolite was acidic,it agglomerated because of the gravitational coagulation between variable charge of itself and the permanent charge of clay crystallinity minerals;when the solution was alkalinity,the surface of imogolite became neutral and agglomerated.
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