碱性水热活化选硫尾矿基地聚合物的制备及性能  

Preparation and Properties of Sulfur Tailings-Based Geopolymer Activated by Alkaline Hydrothermal Method

作　　者：王文耀 罗琦 鲁刘磊 赖金 黄文昊 庄荣传 汪峻峰 马俊[3] WANG Wenyao;LUO Qi;LU Liulei;LAI Jin;HUANG Wenhao;ZHUANG Rongchuan;WANG Junfeng;MA Jun(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Resources,Longyan 364200,China;China Construction Eighth Engineering Division Co.,Ltd.,Shenzhen 518035,China)

机构地区：[1]深圳大学土木与交通工程学院,深圳518060 [2]低品位难处理黄金资源综合利用国家重点实验室,龙岩364200 [3]中国建筑第八工程局有限公司,深圳518035

出　　处：《硅酸盐通报》2024年第10期3704-3714,共11页Bulletin of the Chinese Ceramic Society

基　　金：海南省重点研发项目(ZDYF2022SHFZ322);广东省滨海土木工程耐久性重点实验项目(SZU)(2020B1212060074)。

摘　　要：为解决尾矿预处理方法能耗高的问题,探索一种低能耗的尾矿活化方法,对部分选硫尾矿进行碱性水热活化预处理以提高其活性,改善选硫尾矿基地聚合物的力学性能。研究活化温度和活化时间对碱性水热活化效果的影响,并采用X射线衍射技术、傅里叶变换红外光谱分析、热重分析、核磁共振成像分析和扫描电子显微镜测试对活化选硫尾矿及其制备的地聚合物进行性能表征。结果表明,当选硫尾矿在200℃下活化2.0 h后,制备的地聚合物3和28 d抗压强度最高,分别为15.5和22.1 MPa。碱性水热活化能有效破坏选硫尾矿中的结晶相,促进活性硅铝的溶出,在凝胶体系内部形成更多水化产物凝胶,改善地聚合物的孔结构,从而提高选硫尾矿基地聚合物的抗压强度。以上结果表明碱性水热活化法是一种可有效提高选硫尾矿活性的方法。To solve the problem of high energy consumption in tailings pretreatment methods and explore a low energy consumption tailings activation method,alkaline hydrothermal activation pretreatment was carried out on part of sulfur tailings to enhance their activity and improve the mechanical properties of sulfur tailings-based geopolymers.The influences of activation temperature and activation time on alkaline hydrothermal activation effect have been studied.X-ray diffraction technology,Fourier transform infrared spectroscopy analysis,thermogravimetric analysis,nuclear magnetic resonance imaging analysis,and scanning electron microscopy test were used to characterize the performance of activated sulfur tailings and sulfur tailings-based geopolymers.The results show that when the sulfur tailings are activated at 200℃for 2.0 h,the prepared geopolymer obtains the highest 3 and 28 d compressive strength,which are 15.5 and 22.1 MPa,respectively.Alkaline hydrothermal activation can effectively destroy the crystalline phase in sulfur tailings,promote the release of active silica and aluminum.More hydration product gel is formed in the gel system to improve the pore structure of geopolymer,thus improving the compressive strength of sulfur tailings-based geopolymers.The above experimental results indicate that alkaline hydrothermal activation is a method that can effectively improve the activity of sulfur tailings.

关 键 词：地聚合物 选硫尾矿 碱性水热活化法 无侧限抗压强度 微观分析 物相分析 

分 类 号：X705[环境科学与工程—环境工程]