机械力活化对铁尾矿活化性能的影响研究

Effect of Mechanical Force on the Activation of Iron Ore Tailings

通过机械粉磨时间对铁尾矿粉密度、比表面积、颗粒分布以及微观形貌影响研究得出:随着粉磨时间的延长,铁尾矿粉颗粒逐渐被细化,密度先减后增,比表面积先增后减;粉磨2 h时,比表面积达到最大值770 m^2/kg,粒径(5±2)μm的颗粒含量约为40%,且小于5.13μm的颗粒累积含量最高,但过度粉磨会有弱团聚现象;通过研究机械力活化对铁尾矿粉活性的影响以及红外光谱(IR)分析得出:粉磨2 h的铁尾矿粉在10%~50%掺量下,其3 d、7 d、28 d抗折强度比与活性指数均为最大值,该粉磨时间下最大程度的活化了铁尾矿粉;机械粉磨细化作用使颗粒无序化物质增多,致使活性提高。

Effects of grinding time on density, ratio surface area, particle distribution and micrographs of iron tailing powder were discussed, it concluded that iron tailings powder particles was gradually refined, meanwhile the density first decreased and then increased, the specific surface area increased first and then decreased with the extension of grinding time. When the grinding time was 2 h, the specific surface area reached the maximum value of 700 m^2/kg particle size （5 ±2） （jim particle content is about 4 0 % , less than 5. 13 jjim diameter of particles accumulate the highest. But excessive grinding will have w e a k agglomeration. It was suggested by the analysis of mechanical activation effect on the activity of the iron ore tailing and IR that, at 10% -50% content of the grinding of 2 h iron ore tailings, the flexural strength ratio and the activity index of 3 d, 7 d and 28 d were the maximum. The grinding time maximum activated iron ore tailing. The grain refinement disordered substances increased, resulting in enhanced activity by mechanical grinding.