Abstract:

In order to understand the influence of surfactants,namely,lignosulfonates,on the preparation propertv of coal‘water slurry,the adsorption performance of lignosulfonates on coal-water interface was investigated bv mea-suring the adsorption isotherms,thus revealing the influences of the relative molecular masses of lignosulfonates.the metal cations，the pH and the temperature of coal-water suspension,as well as the stirring time.The resuIts show that the adsorption capacity increases with the increase in the relative molecular mass of lignosulfonate. and that univalent cation is helpful to the improvement of adsorption capacity because it can be more easilv adsorbed onto coal‘water interface.Moreover,it is indicated that the pH and the temperature of the SUSpension ,as well as the stiring time are important parameters to be controlled in the suspension preparation because they will greatlv influ-ence the adsorption of lignosulfonates on coal·water interface． Furtherm ore，the corresponding adsorption type was researched by the adsorption experiments of lignosulfonates with different relative molecular masses． It is then con-cluded that the first adsorption level follows the adsorption model of Langmuir.The reason for the weak adsorption intensity in experiments was also preliminarily discussed.

Key words: lignosulfonates, coal-water interface, adsorption perform ance