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    孙伟吉, 刘浪, 方治余, 朱梦博, 何伟, 高宇恒. 液固比、成型压力和碳化时间对镁渣碳化性能的影响[J]. 应用基础与工程科学学报, 2024, 32(5): 1374-1393. DOI: 10.16058/j.issn.1005-0930.2024.05.013
    引用本文: 孙伟吉, 刘浪, 方治余, 朱梦博, 何伟, 高宇恒. 液固比、成型压力和碳化时间对镁渣碳化性能的影响[J]. 应用基础与工程科学学报, 2024, 32(5): 1374-1393. DOI: 10.16058/j.issn.1005-0930.2024.05.013
    SUN Weiji, LIU Lang, FANG Zhiyu, ZHU Mengbo, HE Wei, GAO Yuheng. Effects of Liquid Solid Ratio,Molding Pressure and Carbonization Time on Carbonization Properties of Magnesium Slag[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1374-1393. DOI: 10.16058/j.issn.1005-0930.2024.05.013
    Citation: SUN Weiji, LIU Lang, FANG Zhiyu, ZHU Mengbo, HE Wei, GAO Yuheng. Effects of Liquid Solid Ratio,Molding Pressure and Carbonization Time on Carbonization Properties of Magnesium Slag[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1374-1393. DOI: 10.16058/j.issn.1005-0930.2024.05.013

    液固比、成型压力和碳化时间对镁渣碳化性能的影响

    Effects of Liquid Solid Ratio,Molding Pressure and Carbonization Time on Carbonization Properties of Magnesium Slag

    • 摘要: 镁渣是一种碳化后具有高力学性能和CO2储存能力的工业固废.目前,针对镁渣碳化方面的研究相对较少.探究了液固比、碳化时间和成型压力对镁渣碳化性能的影响,重点讨论了3种条件下镁渣试块的碳化程度与固碳效率.通过压力测试、热重分析、X射线衍射、红外光谱、扫描电镜和压汞分析等试验测试,对碳化试块的力学性能、碳化产物、矿物成分以及微观形貌进行表征.结果表明:(1)镁渣在高浓度CO2湿润环境下,其自身含有的矿物主相γ-硅酸二钙(γ-C2S)能快速反应生成碳酸钙晶体和聚合度较高的二氧化硅凝胶,形成类似于水化硅酸钙凝胶结构,提升碳化镁渣试块的力学性能.(2)碳化镁渣试块的力学性能与固碳效率均随液固比、成型压力、碳化时间的增加而增加.(3)当液固比为1∶4、成型压力为30MPa、碳化时间为12h时,碳化镁渣试块的抗压强度高达69.7MPa,固碳效率达到10.9%.由此可知,碳化养护可以将镁渣转化为高力学性能的新型储碳材料,这也为镁渣的资源化利用和矿化封存CO2提供了新思路.

       

      Abstract: Magnesium slag is an industrial solid waste with high mechanical properties and a capacity for CO2 storage following carbonization.To date,there has been a paucity of research conducted on the carbonization of magnesium slag.The effects of the liquid-solid ratio,carbonization time and molding pressure on the carbonization properties of magnesium slag were examined,and the carbonization degree and carbon fixation efficiency of magnesium slag samples under three conditions were discussed.The mechanical properties,carbonation products,mineral composition and microstructure of the carbonation specimens were characterised by a series of analytical techniques,including pressure testing,thermogravimetric analysis,x-ray diffraction,infrared spectroscopy,scanning electron microscopy and mercury intrusion analysis.The findings demonstrate that:(1) In a humid environment with a high concentration of CO2,the mineral main phase γ-C2S of magnesium slag can react rapidly to form calcium carbonate crystals and silica gel with a high degree of polymerisation,resulting in a gel structure comparable to calcium silicate hydrate and an enhancement in the mechanical properties of the magnesium carbide slag test block.(2) The mechanical properties and carbon fixation efficiency of the magnesium carbide slag sample demonstrated an increase with the elevation of the liquid-solid ratio,molding pressure,and carbonization time.(3) When the liquid-solid ratio is 1/4,the molding pressure is 30MPa,and the carbonization time is 12h,the compressive strength of the magnesium slag carbonization test specimens reaches 69.7MPa,and the carbon sequestration efficiency is 10.9%.It is evident that the carbonization process can transform magnesium slag into a novel type of carbon storage material with enhanced mechanical properties.This offers a promising avenue for the recycling and mineralisation of magnesium slag as a means of storing CO2.

       

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