多元固废地聚合物的制备与性能研究  

Preparation and Performance Study of Multi-Solid Waste Geopolymers

作　　者：张延年[1,2] 杨吴斌 韩东 回志峰 刘畅 Zhang Yannian;Yang Wubin;Han Dong;Hui Zhifeng;Liu Chang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168;School of Civil Engineering,Dalian Jiaotong University,Dalian,Liaoning 116028;Liaoning Provincial Product Quality Supervision and Inspection Institute,Shenyang,Liaoning 110031)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连交通大学土木工程学院,辽宁大连116028 [3]辽宁省产品质量监督检验院,辽宁沈阳110031

出　　处：《非金属矿》2024年第1期99-102,107,共5页Non-Metallic Mines

基　　金：国家自然科学基金重点项目(52234004);沈阳市科技项目(22-322-3-04)。

摘　　要：为实现尾矿等固废材料的再生利用,提高工业固废利用率,以铝土矿尾矿、矿渣和陶瓷粉为原料,NaOH-Na_(2)SiO_(3)复合溶液为碱激发剂合成多元固废地聚合物,研究复合激发剂在不同碱当量时对地聚物抗压强度的影响,并通过X射线衍射(XRD)、傅里叶红外光谱(FTIR)和扫描电镜(SEM)探究影响机理。结果表明,随着复合激发剂碱当量的增加,地聚物各龄期抗压强度呈先增大后减小的趋势,当复合激发剂碱当量为5%时,制品28 d抗压强度达到最佳值,为63.3 MPa。适当增加碱当量对抗压强度有利,但碱当量过大会导致抗压强度降低。微观分析表明,不同碱当量合成的地聚物均发生了一定程度的聚合反应,并生成了以水化硅铝酸钙(C-A-S-H)为主的无定形水化产物,聚合反应程度随着碱当量的增加而增大,微观结构则表现为基体更均匀致密。In order to realize the recycling of tailing solid waste materials and improve the utilization rate of industrial solid waste,a multi-solid waste geopolymer was synthesized using bauxite tailings,glanulated blast furnace slag,and ceramic powder as raw materials,and NaOH-Na_(2)SiO_(3) composite solution as an alkali activator.The effect of the composite activator on the compressive strength of the geopolymer at different alkaliequivalent was studied,and the influencing mechanism was explored through XRD,FTIR,and SEM.The results showed that with the increase of the alkali-equivalent of the composite activator,the compressive strength of the geopolymer at each age increased first and then decreased.When the alkaliequivalent of the composite activator was 5%,the compressive strength of the product at 28 d reached the optimal value of 63.3 MPa.Increasing the alkali-equivalent appropriately was beneficial for compressive strength,but excessive alkali-equivalent could lead to a decrease in compressive strength.Microscopic analysis showed that geopolymers synthesized with different alkali-equivalent had a certain degree of polymerization reaction and generated amorphous hydration products mainly composed of C-A-S-H.The degree of polymerization reaction increased with the increase of alkaliequivalent,and the microstructure showed that the matrix was more uniform and dense.

关 键 词：铝土矿尾矿 矿渣 陶瓷粉 地聚物 聚合反应 微观结构 

分 类 号：TQ177[化学工程—硅酸盐工业] X705[环境科学与工程—环境工程]