提高矿粉活性方法的研究

Study on improving the activity method of mineral powder

通过物理球磨,化学激发剂两种活化方式共同来改善新疆当地的一种矿粉活性。使用正交试验,研究了球磨时间和激发剂用量对该矿粉活性影响,以及活化后矿粉掺量对胶砂试块强度的影响。试验结果表明:Na_2SO_4对该矿粉的激发效果更好,当激发剂掺量为3%,球磨时间在90~100 min时,可以有效地提高矿粉活性,且增加活性后的矿粉掺量范围扩大40%~50%,仍可以增加胶砂试块标准及后期强度,很大程度的提高了该矿粉的使用率。微观测试表明,激活后的矿粉提高了胶砂密实度,改善了胶材对砂的包裹性能,有利于钙矾石晶体的生长,促进了水泥水化。

Mechanical activation and chemical activation were chosen for two kinds of activation methods to improve the activity of mineral powder from Xinjiang.Through orthogonal test,it was ensured in milling time and excitation agent dosage,after that the influence of the strength of mortar test block adding the activation of different dosage of mineral powder was studied.Test results show edsodium sulfate excitation effect was better than sodium hydroxide,when exciting agent content was 3% and ball grinding time was 90~100 min,the activity of mineral powder dosage range could be expanded to 40%~50% but strength could also be increased in standard age and later age.It was greatly improved the utilization of mineral powder.The microtest results proved that the post-activated minerall powder increased mortar compactness and improved the coating properties of the glue to the sand.It was led directly beneficial to the growth of calcium alum crystals and promoted cement hydration.