In order to study the relationship between coal surface properties and slurryability

the adsorption properties of three kinds of coal

the variation of the contacting angle and Zeta potential after adding the dispersant

and the slurry concentration under different dispersant dose are investigated

by adding the methyl naphthalene sulfonate as dispersant.The results show the adsorption amount is related to the rank of coal

the higher the rank

the greater the adsorption amount.The addition of dispersant increases the contacting angle of lignite whose metamorphic grade is lower

but reduces that of the coal with higher metamorphic grade.The absolute Zeta potential value increased with the dispersant concentration at first

and then being balanced.The slurrying experiments show the solid concentration of the lignite is about 53.5%

which is lower than that of the bituminous coal

in which that of the Datong coal is about 60% and that of the Pingdingshan coal is about 68%

indicating the water slurry concentration is greatly related to the coal characteristics.The coal water slurry characteristics are improved significantly by changing the coal surface property using the dispersants.The CWS will have the maximum concentration when dispersant amount is about 10% higher than the saturated adsorption amount.