碱激发金矿粉充填材料力学性能及微观分析  

Mechanical Properties and Microscopic Analysis of Alkali⁃Activated Backfill Material with Gold Mine Tailings Powder

作　　者：罗正东[1] 蒋波[1] 章本本 邓代强 李翔 LUO Zhengdong;JIANG Bo;ZHANG Benben;DENG Daiqiang;LI Xiang(School of Civil Engineering,Xiangtan University,Xiangtan 411105,Hunan,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]湘潭大学土木工程学院,湖南湘潭411105 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《矿冶工程》2023年第4期21-25,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51764009);湖南省教育厅优秀青年项目(21B0123)。

摘　　要：以金尾矿为骨料、粉磨后的金尾矿(简称金矿粉)为前驱体原料,以氢氧化钠+水玻璃为碱激发剂,采用碱激发方式制备充填材料,研究了金矿粉颗粒细度、碱激发剂模数及掺量对充填体力学性能的影响。结果表明,当金矿粉磨矿时间60 min(粒度d 50为5.939μm)、碱激发剂水玻璃模数及掺量分别为1.2和60%时,充填体28 d抗压强度为854.2 kPa,满足GB/T 39489—2020《全尾砂膏体充填规范》对充填体强度的要求。在碱激发剂作用下,金矿粉发生水化反应,生成大量硅铝酸盐凝胶,形成密实稳定的结构,使充填体具有良好的力学性能。With gold tailings as aggregate and ground gold mine tailings(referred to as gold mine tailings powder)as precursor materials,a kind of backfill material was prepared by alkali activation with sodium hydroxide together with sodium silicate as an activating agent.The effects of several factors,including particle size of gold mine tailings powder,modulus and addition of activating agent,on the mechanical properties of backfill mass were studied.The test results show that when gold mine tailings is ground for 60 min(size d 50 of 5.939μm),modulus and addition of sodium silicate in activating agent are 1.2 and 60%respectively,the prepared backfill mass can have a 28 d compressive strength of 854.2 kPa,completely up to the requirement for backfill mass stipulated in the GB/T 39489—2020“Technical Specification for Paste Filling with Total Tailings”.Due to alkali activation,gold mine tailings powder is subjected to a hydration reaction,yielding a large amount of aluminosilicate gel,which forms a dense and stable structure,resulting in the backfill mass with good mechanical properties.

关 键 词：金尾矿 碱激发 充填材料 力学性能 微观分析 

分 类 号：TD853[矿业工程—金属矿开采]