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贺严,康虔,兰明,张树文.活化锂渣基细粒径全尾砂胶结充填材料力学特性研究[J].南华大学学报(自然科学版),2022,(1):32~38.[HE Yan,KANG Qian,LAN Ming,ZHANG Shuwen.Research on Mechanical Characteristics of the Activated Lithium Slag-based Cemented Material for Fine Tailings Backfill[J].Journal of University of South China(Science and Technology),2022,(1):32~38.]

活化锂渣基细粒径全尾砂胶结充填材料力学特性研究

Research on Mechanical Characteristics of the Activated Lithium Slag-based Cemented Material for Fine Tailings Backfill

投稿时间：2021-04-06

DOI：10.19431/j.cnki. 1673-0062.2022.01 005

中文关键词: 活化锂渣充填材料火山灰活性玻璃体结构力学特性

英文关键词:activated lithium slag backfill material pozzolanic activity glass structure mechanical characteristics

基金项目:湖南省教育厅科学研究重点项目(21A0264);湖南省教育厅优秀青年项目(20B517)

作者	单位
贺严	南华大学资源环境与安全工程学院,湖南衡阳 421001
康虔	南华大学资源环境与安全工程学院,湖南衡阳 421001 金属矿山安全与健康国家重点实验室,安徽马鞍山 243000
兰明	南华大学资源环境与安全工程学院,湖南衡阳 421001
张树文	南华大学资源环境与安全工程学院,湖南衡阳 421001

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中文摘要:

以江西某铅锌矿为例,探索活化锂渣作为细粒径全尾砂辅助胶凝材料的可行性。基于玻璃体结构理论,研究了NaOH化学改性和熔融-水淬作用对冶炼锂渣火山灰活性的影响,设计并开展了活化锂渣-全尾砂充填配比试验,测试了活化锂渣基全尾砂充填材料的7 d、28 d和56 d单轴抗压强度。结果表明,活化锂渣的化学成分以SiO₂和Al₂O₃为主,具有较大的比表面积和较高的玻璃化程度;NaOH化学改性能够促进锂渣玻璃体中Q⁴网状结构向聚合度更低的Q²链状结构转化,有利于火山灰活性的提高;当灰砂比为1∶4和1∶6,质量浓度为66%、68%和70%时,各组活化锂渣-全尾砂充填体样品的28 d和56 d抗压强度可达到水泥-全尾砂样品的102.4%和104.4%,能够满足细粒径全尾砂充填材料力学性能的需要。

英文摘要:

The feasibility of activated lithium slag as cementitious material of fine tailings was explored by taking a lead-zinc mine in Jiangxi province as an example. Based on the theory of vitreous structure, the effects of NaOH modification and melt-quenching on pozzolanic activity of lithium slag were studied. The backfill experiments of activated lithium slag-fine tailings were carried out, and the 7,28 and 56 d uniaxial compressive strength (UCS) of the samples were tested. The results showed that the activated lithium slag was mainly composed of SiO₂ and Al₂O₃ with large specific surface area and high degree of vitrification. The chemical modification of NaOH can promote the transformation of Q⁴ network structure into Q² chain structure with lower degree of polymerization. With the cement-tailing ratios of 1∶4 and 1∶6, and the mass concentration of 66%, 68% and 70%, the UCS of activated lithium slag-tailings samples for 28 and 56 d reached 102.4% and 104.4% of the cement-tailings samples, which can satisfy the mechanical requirements of cemented backfill materials for fine tailings.

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