某低活性酸性矿渣微粉的机械力化学效应研究

为减少冶炼矿渣堆存对环境的污染，提高矿渣微粉的综合利用率，实现固体废弃物的循环利用，通过微观分析、强度试验等手段对一种低活性酸性矿渣微粉展开机械力化学效应研究，探究矿渣微粉经机械粉磨后的充填体性能。试验结果表明：矿渣微粉机械粉磨30 min、60 min、90 min后，特征粒径从22.49 μm分别降至18.55 μm、13.80 μm、10.61 μm，颗粒形态由不规则多边形大颗粒转变为表面棱角不分明的卵石状小颗粒，但并未引起相态的变化；在其他条件相同的情况下，矿渣微粉粉磨时间延长，胶砂试块的抗压强度增长，粉磨60 min后对应试块的抗压强度满足矿山充填要求。可见，矿渣微粉粒度变细可显著提升矿渣微粉的活性，进而提高充填体试件的抗压强度。

Study on Mechano-chemistry Effect of a Low Activity Acid Slag Powder

In order to improve the resource utilization of slag powder， reduce the environment pollution of surface deposit and efficiently recycle the solid waste， the mechano-chemistry effect of low activity acid slag powder has been studied by means of microanalysis and strength test. The results show that the characteristic particle size of slag powder particle size after 30 min， 60 min and 90 min mechanical grinding decreased from 22.49 μm to 18.55 μm， 13.80 μm and 10.61 μm. The phase of slag powder does not change by mechanical grinding， but the surface morphology changes from massive particles with irregular polygons into small particles with pebbles and smooth surface. The compressive strength of filling body is increased with grinding time extension under the same conditions. After 60 min mechanical grinding， the compressive strength of test block meets filling requirements of the mine， so the potential activity of slag powder can be significantly improved by mechanical grinding， in turn the comprehensive strength of filling sample is increased.