摘要
尾砂胶结充填材料的流动性和强度是决定充填质量和效果的2个最为重要的性能指标。研究了复合外加剂(主要为液体硅酸钠和减水剂等)的掺入对二道沟金矿全尾砂胶结充填材料流动性和强度的改善效果。结果表明:塌落度与料浆浓度间存在明显的非线性关系。料浆浓度越高,料浆浓度的增加造成的流动性降幅越大。复合外加剂能够显著改善全尾砂充填料浆的流动性,随着料浆浓度和灰砂比的增加,复合外加剂对充填料浆流动性改善效果愈显著。灰砂比和龄期显著影响着复合外加剂对强度的改善效果,而料浆浓度影响基本可以忽略;灰砂比和龄期对复合外加剂改善效果存在着耦合影响。在实际生产中,可以考虑使用外加剂来提高充填体强度,可以大幅降低水泥用量,节省充填成本。
The fluidity and strength of cemented tailings backfill materials are 2 of the most critical performance indicators that determine the quality and effectiveness of backfilling.This study investigates the effects of incorporating compound additives that are mainly liquid sodium silicate and water reducers on improving the fluidity and strength of cemented ungraded tailings backfill materials at the Erdaogou Gold Mine.The results show a clear nonlinear relationship between slump and slurry concentration:the higher the slurry concentration,the greater the decrease in fluidity caused by further increases in concentration.Compound additives can significantly enhance the fluidity of ungraded tailings backfill slurry,with their effects becoming more pronounced as slurry concentration and cement‑sand ratio increase.The cement‑sand ratio and curing age have a significant influence on the strength improvement effect of compound additives,whereas the influence of slurry concentration is negligible.There is a coupling effect between the cementsand ratio and curing age on the strength enhancement of compound additives.In practical production,the use of additives to improve the backfill strength can significantly reduce cement consumption and lower backfilling costs.
作者
黎凡秀
Li Fanxiu(Liaoning Erdaogou Gold Mining Co.,Ltd.)
出处
《黄金》
2025年第8期24-28,共5页
Gold
基金
国家重点研发计划项目(2022YFC2905004)。
关键词
全尾砂
胶结充填
复合外加剂
流动性
强度
塌落度
ungraded tailings
cemented backfill
compound additive
fluidity
strength
slump
