Abstract: At present，the Layigelaike bentonite ore in Hami was the only explored large sodium base bentonite ore in our country.In order to find the purification process of bentonite with high efficiency and low consumption，comparison of chemical purification with high speed centrifugal process was conducted based on the bentonite property.The results show that：①the montmorillonite content of bentonite is up to 78%，Ethylene blue adsorbed is 0.35 g/g，gelatin price 54 mL/g，expansion capacity 27 mL/g，cation exchange capacity of 1.01 mmol/g，and the ore belongs to high quality sodium base bentonite ore.②under conditions of serum concentration of 6%，centrifugal separation speed of 2 500 r/min，and the centrifugal separation for 15 min，high-quality bentonite concentrate with 0.429 g/g of ethylene blue adsorbed and 97.00% of montmorillonite is achieved by adopting high speed centrifugation purification with high investment and operation costs;with serum concentration of 7%，pH 7.0 and the concentration of sodium hexametaphosphate 0.075%，the bentonite concentrate with 0.418 g/g ethylene blue adsorbed and 94.70% of montmorillonite is achieved by adopting the chemical purification method with characteristics of easier operation and lower production costs.

Key words: Sodium base bentonite, Property representation, Ethylene blue adsorbed, Montmorillonite content, Chemical purification, High speed centrifugation purification