Abstract：Ca-Bentonite of Fuxin Liaoning was modified by cetyltrimethylammonium bromide (CTAB) to prepare organ-bentonite CTAB-Bt. Ca Y-Bt, Ca J-Bt and CTAB-Bt were combined with flocculant respectively to discuss its effect on slime dehydration and analysis its mechanism. The results show that CTAB successfully intercalates into the montmorillonite interlayer and increases the interlayer spacing. With the use of Ca Y-Bt and flocculant, slime dehydration rate is increased by 2.32 m L/s and filter cake moisture is decreased by 1.84% than without Ca Y-Bt.With the use of Ca J-Bt and flocculant, slime dehydration rate is increased by 0.62 m L/s and filter cake moisture is decreased by2.22%. With the use of CTAB-Bt and flocculant, slime dehydration rate is increased by 1.51 m L/s and filter cake moisture is decreased by 4.95%. With comprehensive consideration of dehydration speed and filter cake moisture, the usage of CTAB-Bt and PAM is the cooperatively best scheme. It indicates that the effects modified bentonite on coal surface, increase the hydrophobicity of coal slime and promotes its hydrophobic agglomerate after analysis of XRD, FTIR, laser particle size and contact angle analysis.

Keywords: modified bentonite; slime; dehydration rate; filter cake moisture; hydrophobic agglomeraterotein