热-机械协同活化铜尾矿水化胶凝性能研究  

Study on the hydration and gelling properties of copper tailings activated by thermal-mechanical synergy

作　　者：李春辉 伊元荣[1,2,3] 刘伟[1] 李洁[1] 史星丽 迪娜·加阿拜 LI Chunhui;YI Yuanrong;LIU Wei;LI Jie;SHI Xingli;DINA Jaabay(School of Ecology and Environment,Xinjiang University,Urumqi 830046,China;Key Laboratory of Xinjiang Oasis Ecology,Ministry of Education,Urumqi 830046,China;Field Scientific Observatory of the Ministry of Education for Temperate Desert Ecosystems,Jinghe,Xinjiang,Urumqi 830046,China)

机构地区：[1]新疆大学生态与环境学院,新疆乌鲁木齐830046 [2]新疆绿洲生态教育部重点实验室,新疆乌鲁木齐830046 [3]新疆精河温带荒漠生态系统教育部野外科学观测研究站,新疆乌鲁木齐830046

出　　处：《中国矿业》2024年第2期149-158,共10页China Mining Magazine

基　　金：新疆自然科学基金项目资助(编号:2022D01C388)。

摘　　要：铜尾矿是铜矿经过一系列工艺选矿完成后剩下的颗粒直径较小的沙粒,其堆存会带来诸多环境问题。铜尾矿结晶度高、活性低,许多研究人员探究激发活性后的铜尾矿作为混凝土等材料的辅料,但利用率较低。本文通过热-机械协同活化的方式激发铜尾矿的活性,分析活性铜尾矿水化胶凝性能,依据抗压强度、粒径分布及矿相成分微观结构变化分析水化反应效果。在此基础上,采用X射线衍射仪(XRD)、傅立叶变换红外光谱(FT-IR)和电子扫描电镜(SEM)对铜尾矿胶凝性能进行分析。研究结果表明:热-机械协同活化激发铜尾矿活性的力学性能有了很大提升,即铜尾矿在600℃、机械球磨时间80 min条件下,活性由5.60%上升至89.91%,抗压强度为10.87 MPa;XRD和FT-IR进一步分析出活化铜尾矿多处产生了水化C—S—H凝胶、N—A—S—H凝胶、钙矾石等胶凝物质,其形状多呈现絮凝状、棉团状及短棒状。本文研究为铜尾矿的进一步利用提供理论支撑。Copper tailings are fine sand particles that remain after the beneficiation processes in copper mines.The accumulation of these tailings can lead to various environmental issues.The crystallinity of copper tailings is high,but the activity is low.Many researchers have explored the use of activated copper tailings as auxiliary materials for concrete and other materials,but the utilization rate is relatively low.This paper stimulates the activity of copper tailings through thermal-mechanical synergy activation,analyzes the hydration and cementation performance of activated copper tailings,and analyzes the hydration reaction effect based on compressive strength,particle size distribution,and microstructure changes of mineral phase composition.X-ray Diffractometer(XRD),Fourier Transform Infrared Spectroscopy(FT-IR),and Scanning Electron Microscopy(SEM)are employed to further analyze the gelling properties of copper tailings.The results show that the mechanical properties of copper tailings activated by thermal-mechanical synergy have been greatly improved.Specifically,the activity of copper tailings increases from 5.60%to 89.91%with the conditions of 600℃and the mechanical ball milling time of 80 minutes,resulting in a compressive strength of 10.87 MPa.The XRD and FT-IR analysis reveal the presence of hydrated C—S—H,N—A—S—H,ettringite,and other cementitious substances in various forms such as flocculation,cotton ball,and short rod.The study provides valuable theoretical support for the further utilization of copper tailings.

关 键 词：铜尾矿 热-机械协同 活性激发 水化 胶凝性能 

分 类 号：TD98[矿业工程—选矿]