The effect of DA dispersant on the grinding efficiency of bauxite was studied and the mechanisms was also analyzed in this paper by measuring the absorption characteristics, grinding pulp viscosity, the surface electric potential of the bauxite and the surface appearance of particles. The results showed that the content of-0. 074mm in the ground product was increased by 3. 64 percent points under the same grinding conditions using DA dispersant as grinding aid. The physical adsorption and chemical adsorption were occurred on the bauxite surface, which could reduce the pulp viscosity, change the surface electric potential of the bauxite and enhance the surface appearance of particles. But the effect of DA dispersant on the surface hardness of the bauxite was very low.%研究了DA分散剂对铝土矿磨矿效率的影响,并结合吸附特性、磨矿矿浆黏度、铝土矿表面电位以及磨矿产品颗粒形貌等指标的测定,研究了助磨剂的作用机理.结果表明:在其他磨矿参数相同的条件下,可使磨矿产品中-0.074mm的含量提高3.64个百分点；DA分散剂在铝土矿表面产生物理吸附和化学吸附,降低了磨矿矿浆的黏度,改变了铝土矿表面的电位,改善了颗粒形貌,但对铝土矿表面硬度的影响较小.
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