基于自燃烧技术的铁铝酸钙固溶体低温制备与特性研究

汪健; 雷金松; 方国宝; 乔鑫位; 李杨; 董芸; 严建军

doi:10.11988/ckyyb.20230823

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raybet体育在线院报 ›› 2024, Vol. 41 ›› Issue (9) : 146-152. DOI: 10.11988/ckyyb.20230823

水工结构与材料

基于自燃烧技术的铁铝酸钙固溶体低温制备与特性研究

汪健 ¹ ,
雷金松 ² ,
方国宝 ³ ,
乔鑫位 ⁴ ,
李杨 ⁵ ,
董芸 ⁵ ,
严建军 ⁵

作者信息 +

High Efficiency Synthesis of Calcium Aluminoferrite at Low Temperature Based on Self-propagating Combustion Reaction

WANG Jian ¹ ,
LEI Jin-song ² ,
FANG Guo-bao ³ ,
QIAO Xin-wei ⁴ ,
LI Yang ⁵ ,
DONG Yun ⁵ ,
YAN Jian-jun ⁵

Author information +

文章历史 +

摘要

熟料煅烧是影响硅酸盐水泥生产能耗的关键环节,而熟料矿物相的高效能低温制备是水泥工业研究的重点。以可溶性的金属硝酸盐和尿素为原料,借助自蔓延燃烧(SPCR)法在低温下制备出铁铝酸四钙(C₄AF),并借助X射线衍射(XRD)、傅里叶变换红外(FTIR)、扫描电子显微镜(SEM)和等温微量热技术,研究了合成C₄AF的矿物组成、结晶程度、颗粒形貌、水化特性等特性。结果表明:SPCR法能够在500 ℃恒温2 h制备出纯度和结晶程度均较好的C₄AF,优选的原材料质量比为 $m C a (N O 3) 2 · 4 H 2 O$ ∶ $m A l (N O 3) 3 · 9 H 2 O$ ∶ $m F e (N O 3) 3 · 9 H 2 O$ ∶ $m C O (N H 2) 2$ =1.259∶1.0∶1.077∶2.664。CaCO₃是SPCR法制备C₄AF的过渡相,增加尿素用量有利于提高反应温度,改善C₄AF的结晶程度。合成C₄AF具有较高的水化活性,水化30 min内出现放热峰,水化过程中无休眠期出现,完全水化时的水化热为474 J/g。

Abstract

Clinker calcination is a critical stage that influences the energy consumption in Portland cement production, and improving the efficiency of clinker manufacturing is a major concern in cement chemistry. This paper focuses on the synthesis of tetra-calcium aluminoferrite (C₄AF) at low temperatures with soluble metallic nitrate and urea as raw materials using the self-propagating combustion reaction (SPCR) method. We systematically analyze the mineral phase composition, crystallinity, particle morphology, and hydration behavior of the synthesized C₄AF using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and isothermal microcalorimetry. Our findings demonstrate that high-purity C₄AF can be successfully synthesized via the SPCR method at 500 ℃ for 2 hours. The optimal raw material ratio by weight is $m C a (N O 3) 2 · 4 H 2 O$ ∶ $m A l (N O 3) 3 · 9 H 2 O$ ∶ $m F e (N O 3) 3 · 9 H 2 O$ ∶ $m C O (N H 2) 2$ =1.259∶1.0∶1.077∶2.664. CaCO₃ is the only transient phase during the formation of C₄AF. Increasing the urea dosage effectively raises reaction temperature and enhances the crystallinity of the synthesized C₄AF. Additionally, the synthesized C₄AF exhibits high hydration activity with only one peak observed in the hydration heat release curve during the initial 30 minutes. No dormancy period is observed, and the calculated hydration heat at complete hydration is 474 J/g.

导出引用

汪健, 雷金松, 方国宝, 等. 基于自燃烧技术的铁铝酸钙固溶体低温制备与特性研究[J]. raybet体育在线院报. 2024, 41(9): 146-152 https://doi.org/10.11988/ckyyb.20230823

WANG Jian, LEI Jin-song, FANG Guo-bao, et al. High Efficiency Synthesis of Calcium Aluminoferrite at Low Temperature Based on Self-propagating Combustion Reaction[J]. Journal of Yangtze River Scientific Research Institute. 2024, 41(9): 146-152 https://doi.org/10.11988/ckyyb.20230823

中图分类号： TV431 (水工混凝土)

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