School of Mining and Safety Engineering, Shandong University of Science and Technology Henan Provincial Key
Lab of Mineral Resource Green and High Efficient Mining and Comprehensive Uilization, Henan Polytechnic
University

为提高粗粉煤灰的综合利用效率,运用电镜扫描和粒度分析方法对粗粉煤灰活性进行研究,探究粗粉煤灰在机械研磨过程中活性随时间的变化关系,观察不同机械研磨时间下粉煤灰活性的激发效果,并分析了机械研磨粗粉煤灰活化机理。试验结果表明:研磨20 min时粗粉煤灰胶结剂的强度增长幅度最高,达50%,继续研磨强度增长速率明显下降,因此,机械研磨激发粗粉煤灰活性应控制在20 min内,继续研磨对提高活性作用不大。机械研磨活化粗粉煤灰机理主要包括物理效应、晶态转变以及化学变化。虽然机械研磨提高了粉煤灰的活性,但不能从根本上激发粗粉煤灰的活性,因此提高粗粉煤灰胶凝性需多方面综合考虑,选取最经济的颗粒细度和研磨时间。

In order to improve the uillization efficiency of reject fly ash, the means of the scanning electron microscopy and the particle size analysis method were a pplied to study the activity of the reject fly ash. A variation relationship of the activity with the time was studied during the mechanical grinding process of the reject fly a sh. An activity stimulating effect of the fly ash was observed under the different mechanical grinding time and activated mechanism of the mechanical grinded reject fly ash was analyzed. The test results showed that when the grinding time reached at 20 min, the strength of the reject fly ash binder would be increased by 50% in max a nd when the grinding time continued and the strength would be obviously reduced. Therefore, the reject fly ash activity stimulated by the mechanical grinding should be controlled within 20 min and the continued grinding would not have a role to improve the activity of the fly ash. The reject fly ash activated mechanism by the mechanica | grinding would mainly include the physics effect, crystalline transition and chemical changes. Although the mechanical grinding could improve the activity of the fly as h, but could not stimulate the activity of the reject fly ash fundamentally.Therefore, to improve the binding of the fly ash, a comprehensive consideration should be requi red from many aspects and the most economic partical fineness and grinding time should be selected.

山东省重点研发计划资助项目(2016GGB01176)；河南省矿产资源绿色高效开采与综合利用重点实验室资助项目(S201609)；