Ding Hao

（Department of Civil Engineering，T singhua University，Beijing 100084）

Abstract

Through investigating the effect of sodium stearate on the rhgology of pulp composed of w ater and finely ground calcium carbonate （GCC） and change of surface free energy of solid particles because of adsorption of sodium stearate on the surface of GCC as w ell as the effect on ultrafine grinding of GCC in w et stirred mill，the all e-f fects and their extent of grinding aid are studied．It is show n that the effect of grinding aid is the result of comprehensive action of tw o effects，one is the improvement of pulp rheology，the other is adsorption w hich leads to low er surface free energy of solid particles，and the former effect is stronger than the latterone．

Keywords：wet ultrafine grinding；grinding aid agent；grinding aid effect

DOI：10.13732/j.issn.1008-5548.1999.02.001