Abstract
The influence of sodium stearate (SDS) as a surface modifier on the grinding behaviour of calcium carbonate and its mechanism was studied via mechanochemical modification in wet stirred mills. The result indicated that the grinding efficiency of calcium carbonate decreased with the addition of SDS, but the decreasing rate did not increase with the increasing dosage of SDS. The influence of SDS was the combinational effect of the following two factors: reduction in grinding efficiency induced by the increase in viscosity of calcium carbonate slurry and the increase in grinding efficiency caused by the reduced surface free energy of particles, in which the former has a stronger effect than the latter one. According to the influence result of SDS, the effects of grinding aid and degree during wet ultrafine grinding were deduced and proved.
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