Abstract: Taking the slime water of one coal preparation plant as research object,carry out high concentration slime water flocculating test,the PAM is used as flocculant.Investigate the relationship between dosage and slime setting velocity as well as the influence of stirring rate and time on flocculation effect.Determine the best flocculation condition.The results show that,when the PAM dosage is 0.10 percent,the maximum setting velocity of slime average is 0.58 mm / s.When the stirring intensity is 150 r / min and 80 r / min,it needs 40 s and 60 s respectively to get better effects.Calculate the fractal theory under the best flocculation condition,which is 1.5737 and 1.7034 when the stirring intensity is 150 r / min and 80 r / min.The combination of these two kinds of stirring methods is beneficial for slime flocculation.