长江科学院院报 ›› 2024, Vol. 41 ›› Issue (9): 146-152.DOI: 10.11988/ckyyb.20230823

• 水工结构与材料 • 上一篇    下一篇

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   

  1. 1 安徽省引江济淮集团有限公司,合肥 231200
    2 安徽水安建设集团股份有限公司,合肥 231200
    3 长江勘测设计集团有限公司,武汉 430010
    4 安徽省水利水电勘测规划设计研究院,合肥 231200
    5 长江科学院 材料与结构研究所,武汉 430010
  • 收稿日期:2023-07-31 修回日期:2023-12-11 出版日期:2024-09-01 发布日期:2024-09-20
  • 通讯作者: 李杨
  • 作者简介:

    汪 健(1992-),男,安徽庐江人,工程师,硕士,主要从事水利水电工程建设及运营管理工作。E-mail:

  • 基金资助:
    中央级公益性科研院所基本科研业务费项目(CKSF2021456/CL); 国家自然科学基金项目(U2040222); 安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20190823179)

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

WANG Jian1(), LEI Jin-song2, FANG Guo-bao3, QIAO Xin-wei4, LI Yang5(), DONG Yun5, YAN Jian-jun5   

  1. 1 Anhui Provincial Group Limited for Yangtze-to-Huaihe River Water Diversion, Hefei 231200,China
    2 Anhui Shui’an Construction Group Co., Ltd., Hefei 231200,China
    3 Changjiang Surveying, Planning andDesigin Institute, Wuhan 430010,China
    4 Anhui Surveying and Design Institute of Water Resources andHydropower,Hefei 231200,China
    5 Material and Structure Department, Changjiang River Scientific ResearchInstitute, Wuhan 430010,China
  • Received:2023-07-31 Revised:2023-12-11 Published:2024-09-01 Online:2024-09-20
  • Contact: LI Yang

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。

关键词: 硅酸盐水泥, 熟料, 铁铝酸四钙, 自蔓延燃烧, 低温

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.

Key words: portland cement, clinker, tetra-calcium aluminoferrite, self-propagating combustion reaction, low temperature

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