粉煤灰和烧结法赤泥制备地聚合物及其性能  

Preparation and Properties of Fly Ash and Sintering Red Mud-based Geopolymers

作　　者：刘诚 周雨潇 任浏祎[1] 杨思原 包申旭[1] LIU Cheng;ZHOU Yuxiao;REN Liuyi;YANG Siyuan;BAO Shenxu(School of Resources and Environmental Engineering,Wuhan University of Technology,Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources of Ministry of Education,Wuhan 430070,Hubei,China)

机构地区：[1]武汉理工大学资源与环境工程学院,关键非金属矿产资源绿色利用教育部重点实验室,湖北武汉430070

出　　处：《矿产综合利用》2024年第5期133-140,共8页Multipurpose Utilization of Mineral Resources

摘　　要：这是一篇陶瓷及复合材料领域的论文。为实现粉煤灰和烧结法赤泥的综合利用,本研究以粉煤灰为主要原料,烧结法赤泥作为辅料,氢氧化钠为碱激发剂协同制备地聚合物。结果表明,地聚合物较佳制备条件为:粉煤灰采取分级(细粒提取)的预处理方式,分级粒径为37μm,细颗粒粉煤灰与烧结法赤泥质量比为7∶3 (g∶g),氢氧化钠的用量为前驱粉体的15%,此时地聚合物室温养护28 d的抗压强度可达35.52 MPa,满足中国《通用硅酸盐水泥》32.5R矿渣硅酸盐水泥的强度标准。通过XRF、XRD、ICP-OES和SEM-EDS对不同预处理方式下的原料及其所制备的地聚合物进行分析测试表明:相比于机械研磨,分级预处理更能有效改善粉煤灰的反应性,使更多活性硅铝组分参与地聚合反应;烧结法赤泥的加入可以促进富钙铝硅酸盐凝胶的形成,使地聚合物的微观结构致密化。本研究为粉煤灰和烧结法赤泥的综合利用提供了新的思路。This is an article in the field of inorganic non-metallic materials.To achieve comprehensive utilization of fly ash and sintering red mud,this study uses fly ash as the main raw material,sintering red mud as an auxiliary material,and sodium hydroxide as an alkaline activator to synergistically prepare geopolymer.The results showed that the optimal preparation conditions for geopolymer were as follows:fly ash was pretreated with a classification pretreatment(extraction of fine fraction),with a graded particle size of 37μm.The mass ratio of fine-grained fly ash to sintering red mud is 7∶3(g∶g),and the dosage of NaOH accounts for 15%of the mass of the precursor powder.The compressive strength of the geopolymer prepared at these conditions reached 35.52 MPa after curing at room temperature for 28 d,meeting the strength standard of 32.5R slag portland cement in the Common Portland Cement of China.The raw materials and geopolymers prepared at different pretreatment methods were analyzed and tested using XRF,XRD,ICPOES,and SEM-EDS.The test results showed that compared to mechanical grinding,classification pretreatment can effectively improve the reactivity of fly ash,allowing more active silicon and aluminum components to participate in geopolymerization reactions.The addition of sintering red mud can promote the formation of calcium-rich aluminosilicate gel and densify the microstructure of geopolymers.This study provides new insights into the comprehensive utilization of fly ash and sintering red mud.

关 键 词：陶瓷及复合材料 粉煤灰 烧结法赤泥 综合利用 地聚合物 

分 类 号：TD989[矿业工程—选矿]