硅铝型铁尾矿粉的无熟料固结性能及水化机理研究(修改后重投)
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北京科技大学

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TB321??

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study On Non Clinker Consolidation Performance And Hydration Mechanism Of silicon Aluminum IronTailings Powder
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1.北京科技大学;2.University of Science and Technology Beijing

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    摘要:

    为探明硅铝型铁尾矿在无水泥环境中的断键重聚行为及机理,本文以硅铝型铁尾矿为主体材料,合理掺配钙硫硅成份校正材料,在磨细比表面积为1000m2/kg时获得了铁尾矿粉的无熟料高强度固结效果. 利用SEM、XRD、TG-DSC测试技术,结合化学分析方法,明确了这种固结材料的水化产物种类、含量及微观形貌,揭示了影响固结体强度的因素及浆体水化机理. 结果表明,钙、硫、硅三组份校正材料的配比为最优方案,硬化浆体28d强度可以达到52MPa. 在水化过程中,钙矾石的快速生成提供了硬化浆体的早期强度,C-S-H凝胶是稳定后期强度的保证,1/6-1/10的晶胶比是确保结构稳定,强度持续发展的关键因素.

    Abstract:

    In order to explore the bond breaking and regrouping behavior and mechanism of silicon aluminum iron tailings in cementless environment, taking silicon aluminum iron tailings as the main material and reasonably mixed with calcium sulfur silicon composition correction material, the clinker free high-strength consolidation effect of iron tailings powder was obtained when the grinding specific surface area was 1000m2 / kg.By means of SEM, XRD, TG-DSC testing techniques and combined with chemical analysis methods, the types, contents and micro morphology of hydration products of the consolidated material were determined, and the influencing factors and hydration mechanism of the consolidated material were revealed. The results show that the proportioning scheme of calcium, sulfur and silicon correction materials is the best, the 28 days strength of clean slurry can reach 52Mpa. The rapid generation of ettringite provides the early strength of the hardened paste during hydration. C-S-H gel is the guarantee for stabilizing the later strength. The ratio of crystal to binder of 1/6~1/10 is the key factor to ensure the stability of structure and the continuous development of strength.

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历史
  • 收稿日期:2021-12-25
  • 最后修改日期:2022-04-11
  • 录用日期:2022-05-01
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