离子型稀土尾矿制备地聚合物的研究  

Research on Utilizing Ionic Rare Earth Tailings for Preparing Geopolymer

作　　者：严义云 严群[2] 罗仙平[3,4] 焦向科[3,4] 王金庆[1] 

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学建筑与测绘工程学院,江西赣州341000 [3]江西理工大学工程研究院,江西赣州341000 [4]江西理工大学江西省矿冶环境污染控制重点实验室,江西赣州341000

出　　处：《非金属矿》2015年第6期5-8,共4页Non-Metallic Mines

基　　金："十二五"国家科技支撑计划项目(2012BAC11B07);江西省科技厅自然科学基金(20122BAB203027);江西省科技厅青年科学基金(20142BAB216008);江西理工大学科研基金项目重点课题(NSFJ2014-K01);江西省教育厅项目(GJJ14426);"赣鄱英才555工程"领军人才培养计划

摘　　要：为实现二次资源的高效利用,在研究稀土尾矿特性的基础上,对稀土尾矿进行球磨-煅烧活化预处理,以活化后稀土尾矿为主要硅铝原料,以水玻璃为碱激发剂,通过浇注成型得到地聚合物试样,并对试样进行表征。结果表明,Na、Al摩尔比对地聚合物的抗压强度影响最大,当n(Na)/n(Al)为0.8,水玻璃模数为1.5,水固比为0.5时,地聚合物的7 d抗压强度最大为18.89 MPa。XRD和SEM分析表明,试样内部形成了无定型的铝硅酸盐凝胶,形成凝胶的反应物主要来源于稀土尾矿中的高岭石。In order to achieve the efficient utilization of secondary resources, rare earth tailings were preprocessed by ball mill-calcination activation, on the basis of studying the characteristics of rare earth tailings. Geopolymers were prepared by the method of casting, activated rare earth tailings utilized as the main silicon aluminium raw material, sodium silicate used as alkali excitation agent. Then samples were characterized by XRD and SEM. Experimental results show that Na/Al molar ratio has the greatest influence on the compressive strength of geopolymer. When the Na/Al is 0.8, modulus of sodium silicate is 1.5, and the water solid ratio is 0.5, seven days compressive strength of the geopolymer is 18.89 MPa. XRD and SEM analysis show that the sample has formed amorphous aluminosilicate gel, which is mainly formed from kaolinite in rare earth tailings.

关 键 词：离子型稀土尾矿 地聚合物 活化 抗压强度 

分 类 号：TQ177[化学工程—硅酸盐工业]