Abstract: In order to improve the effect of powder bentonite in water treatment solid-liquid separation , new modified bentonite compound granules ( MBG ) and natural bentonite granules ( NBG ) were prepared.MBG were prepared by using PVA, NaHCO3 and microwave enhanced Al-bentonite (Al-Bent) as raw materials.NBG were prepared by using PVA , NaHCO3 and raw bentonite ( Na-Bent ) as raw materials.These granules were characterized by EDS , XRD, FTIR, SEM, BET to confirm how the process of preparation would affect the internal structure of MBG .The results show that montmorillonite contained in MBG is better than the montmorillonite in NBG in the space structure .What's more, the pore structure of the MBG is better than that of the NBG .

Key words: modified bentonite granule;natural bentonite granule;characterization;montmorillonite