摘要
为研究某钒矿全尾砂充填体的强度演化规律,本文基于矿山周边矿渣资源,评估了其制备胶凝材料的活性,同时通过井下现场试验进行了验证。室内试验结果表明:该矿全尾砂粒径偏粗,-75μm颗粒占比仅为29.9%,且硫含量较高,对充填体强度发展具有不利影响;矿渣比表面积达431 m^(2)/kg,活性指数为95%,表现出较高活性,适用于开发新型胶凝材料,据此成功研制出矿渣基P3新型胶凝材料。在76%浓度条件下,采用所研制矿渣基胶凝材料的充填体岩芯,其14 d强度较水泥基充填体提高347%,28 d强度提高313%,增强效果显著。井下现场强度试验表明:采用该新型胶凝材料,灰砂比1∶10时可替代水泥配比1∶4的方案,预计每立方米充填成本可降低约52.5元,为该钒矿全尾砂膏体充填系统实现低成本建设与运行提供了重要技术依据。
To investigate the strength evolution of cemented paste backfill using the total tailings from a vanadium mine,this study evaluated the reactivity of slag resources near the mine for preparing cementitious materials and conducted underground field trials for verification.Laboratory test results indicate that the total tailings of the mine are relatively coarse,with particles finer than 75μm accounting for only 29.9%,and have a high sulfur content,which adversely affects the strength development of the backfill.The slag exhibits a specific surface area of 431 m 2/kg and a reactivity index of 95%,demonstrating high activity suitable for developing new cementitious materials.Accordingly,a novel slag-based P3 cementitious material was successfully developed.Under a solids concentration of 76%,core samples of the backfill prepared with the developed slag-based cementitious material showed a 347%increase in 14-day strength and a 313%increase in 28-day strength compared to cement-based backfill,indicating a significant enhancement effect.Underground field strength tests demonstrated that using this new cementitious material with a binder-to-tailings ratio of 1∶10 can replace the cement-based mix design with a ratio of 1∶4.This is expected to reduce the backfilling cost by approximately 52.5 RMB per cubic meter,providing crucial technical support for the low-cost construction and operation of the total tailings paste backfill system at this vanadium mine.
作者
李桃鹏
赖伟
李涛
朱斌
祝鑫
LI Taopeng;LAI Wei;LI Tao;ZHU Bin;ZHU Xin(Shaanxi Wuzhou Mining Co.,Ltd.,Shangluo 726000,Shaanxi,China;Changsha Institute of Mining Research Co.,Ltd.,Changsha 410012,Hunan,China;National Engineering Research Center for Metal Mining,Changsha 410012,Hunan,China;Northwest Nonferrous Geological Mining Group Co.,Ltd.,Xi′an 710054,Shaanxi,China)
出处
《中国钼业》
2026年第1期42-48,共7页
China Molybdenum Industry
关键词
钒矿渣
胶凝材料
活性指数
充填强度
低成本充填
vanadium slag
cementitious material
activity index
filling strength
low-cost filling
