不同碱激发剂作用下稀土尾矿地聚物的抗压强度与泛霜程度研究  

Compressive Strength and Efflorescence Extent of Rare Earth Tailings-based Geopolymer with Different Alkaline Activators

作　　者：焦向科[1,2] 曹志明[3] 李涛[3] 罗仙平[1,2] 严群[4] 陈骞[3] 黄子杰[3] 

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

出　　处：《硅酸盐通报》2016年第11期3819-3825,共7页Bulletin of the Chinese Ceramic Society

基　　金：江西省科技支撑计划项目(20151BBG70015);国家科技支撑计划项目(2012BAC11B07);江西省教育厅科技项目(GJJ14426);江西省自然科学基金资助项目(20142BAB216008);江西理工大学科研基金重点课题(NSFJ2014-K01);江西理工大学博士科研启动基金项目(3401223152)

摘　　要：本研究将稀土尾矿预处理后与适量偏高岭土混合作为硅铝原料制备地聚物,在改变碱激发剂类型及MOH(M=Na或K)浓度的情况下,研究地聚物试样抗压强度与泛霜程度的变化规律。结果表明,在四类碱激发剂(包括NaOH型、KOH型、"NaOH+硅胶粉"型、"KOH+硅胶粉"型)中,使用"KOH+硅胶粉"型激发剂时,可制备出抗压强度最高和泛霜程度最低的地聚物试样,并且所制备优选试样的泛霜程度与其抗压强度的线性相关程度最高;比较四类激发剂各自对应优选地聚物试样的凝胶相中Si含量表明,"NaOH+硅胶粉"型、"KOH+硅胶粉"型激发剂对应的试样分别相对NaOH型、KOH型激发剂对应的试样更高,并且这四个试样在宏观上的强度性能表现与其在微观上的形貌特征得到互相验证。In this research, rare earth tailings were pretreated and combined with appropriate metakaolm. Then the obtained mixture was used as raw Si-A1 material for geopolymer synthesis. By varying the type of alkaline activators and concentration of MOH （ M = Na or K）, the change rules for compressive strength and efflorescence extent of geopolymer samples were investigated. Results showed that, among the four types of alkaline activators （ i. e. type of ＂ NaOH＂ , type of ＂ KOH＂ , type of ＂ NaOH ＋ silica gel powder＂, type of ＂ KOH ＋ silica gel powder＂）, the highest compressive strength and lowest efflorescence extent of geopolymer sample can be reached when selecting type of ＂ KOH ＋ silica gel powder＂ as activators. Besides, the optimal sample prepared using the type of ＂ KOH ＋ silica gel powder＂ as alkaline activator had the most significant linear correlation between compressive strength and efflorescence extent. Among the optimal geopolymer samples corresponding to the four different types of alkaline activators, the sample prepared using ＂ Na0H ＋ silica gel powder＂ （ or ＂ K0H ＋ silica gel powder＂ ） had higher Si content in gel phase than the sample prepared using ＂ NaOH＂ （ or ＂ KOH＂ ）. Macroscopic compressive strength results and microscopic morphology characteristic of the four samples achieved the mutual authentication.

关 键 词：稀土尾矿 地聚物 碱激发剂 抗压强度 泛霜程度 

分 类 号：TU526[建筑科学—建筑技术科学]