预蒸压处理对碳化镁渣体积稳定性和抗压强度的影响

IF 15.8 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Magnesium and Alloys Pub Date : 2025-01-04 DOI:10.1016/j.jma.2024.12.016
Xin Xu, Jinhui Liu, Yuandong Mu, Yixin Zhang, Yuming Zhao, Peixu Yang, Weidong Zhang, Xiaofeng Li, Yong Hu, Weineng Tang, Jiajia Tian, Zhongtao Luo, Shaojun Zhang
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引用次数: 0

摘要

原镁生产伴随着大量镁渣的排放。由于γ-Ca2SiO4 (γ-C2S)和MgO在MS中的水化反应活性较低,导致了MS的体积稳定性问题和MS的利用率较低。为了消除这一问题,本研究提出对MS浆料进行预蒸压,促进γ-C2S和MgO的水化,然后利用其水化产物进行碳化固化制备胶凝材料。首先以MS中的MgO和制备的γ-C2S为研究对象,因为它们是镁渣的主要成分。结果表明,预蒸压处理能显著提高MS中MgO的水化程度,从而从根本上解决MS的体积稳定性问题。同时,γ-C2S预蒸压可诱导生成结晶和非晶C-S-H产物,且与γ-C2S相比,这两种产物均能促进碳化反应。随着预蒸温度的升高,预蒸质谱的碳化程度先增大后减小,质谱碳化的最佳预蒸温度为160℃,此时粉状质谱可以简单地完全碳化。经预蒸压的质谱样品经4 h碳化处理后,抗压强度可达29 MPa。具有良好的可靠性。在体积稳定性测试中,预高压灭菌的碳化质谱样品的体积膨胀率为0.07%,明显低于0.5 %的正常要求。本研究为镁渣在建筑材料中的利用提供了一种新的途径,有助于减少碳排放。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Effect of pre-autoclaving treatment on volume stability and compressive strength of carbonated magnesium slag
The primary magnesium production is accompanied by a large amount of magnesium slag (MS) discharge. The low hydration reactivity of γ-Ca2SiO4 (γ-C2S) and MgO in MS results in the volume stability issue and low utilization rate of MS. To eliminate the issue, this study proposes to pre-autoclave the MS slurry to boost the hydration of γ-C2S and MgO and then utilize their hydration products to prepare cementitious materials by carbonation curing. MgO from MS and prepared γ-C2S are firstly employed as study objects respectively, for they are the main contents of magnesium slag. The results indicate that pre-autoclaving treatment can strongly elevate the hydration degree of MgO from MS, this can substantially solve the volume stability issue of MS. Meanwhile, the pre-autoclaving of γ-C2S induces the generation of crystallized and amorphous C-S-H products, and both products could promote the carbonation reaction when compared to γ-C2S. The carbonation degree of pre-autoclaved MS firstly increases and then decreases with the rising pre-autoclaving temperature, and the optimal pre-autoclaving temperature for MS carbonation is 160 °C, at this time, the powdered MS can be simply carbonated fully. The sample made of pre-autoclaved MS and then subjected to 4 h carbonation could achieve the compressive strength of 29 MPa. with good soundness. During volume stability testing, the volume expansion rate of a carbonated MS sample with pre-autoclaving was 0.07 %, which is significantly lower than the normal requirement of 0.5 %. This research offers a novel approach to utilizing magnesium slag in building materials and contributes to carbon reduction.
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来源期刊
Journal of Magnesium and Alloys
Journal of Magnesium and Alloys Engineering-Mechanics of Materials
CiteScore
20.20
自引率
14.80%
发文量
52
审稿时长
59 days
期刊介绍: The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.
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