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) |
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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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