Research On The Utilization Of Cement Grinding Aid

Cement grinding aids are attracting more and more increasing interest. They increase the grinding efficiency; improve the grain size distribution and the cement performance. Research on cement grinding aids has become a major subject for cement researchers and cement manufacturers.In this paper, two kinds of cement grinding aids were developed according to the clinker characteristics and production line situation. Both laboratory and industrial investigations were utilized to study to performance of the grinding aids systematically.The effects of grinding aids on the powders properties including the fineness, the particles size distribution, as well as Blain's values are determined. And the influence of grinding aids on cement physical properties was also investigated. The results indicate that both kinds of grinding aids increase the powder fineness and the Blain's values considerably. In addition, the grinding aids improves the particles size distribution, especially, makes the grains with the size of 3~30um increasing in large quantities. With the addition of grinding aids, the strengths of cement mortar at 3 days or 28 days get highly increase. Moreover, the grinding aids have more effect on C3S and C3A than the effect on C4AF and C2S. Most interesting, the grinding aid B# has good grinding-aiding effecting on the slag cement. The effect of grinding aids increase linearly with the addition quantity. However, with the addition value reach a given value, the grinding-aiding effect does not increase with the addition amount.In industrial production, the process parameters characteristics with the addition of grinding aids were analyzed systemically. The results indicate that the production rate of the cement mill increase from 33t/h to 37.2t/h with 0.028% addition of grinding aid, which is equal to 12.73% increase. This paper also analyzed the grinding-aiding mechanism.