%0 Journal Article
%A WANG  Jian
%A LEI  Jin-song
%A FANG  Guo-bao
%A QIAO  Xin-wei
%A LI  Yang
%A DONG  Yun
%A YAN  Jian-jun
%T High Efficiency Synthesis of Calcium Aluminoferrite at Low Temperature Based on Self-propagating Combustion Reaction
%D 2024
%R 10.11988/ckyyb.20230823
%J Journal of Yangtze River Scientific Research Institute
%P 146-152
%V 41
%N 9
%X <p id="p00010">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 (C<sub>4</sub>AF) 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 C<sub>4</sub>AF using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and isothermal microcalorimetry. Our findings demonstrate that high-purity C<sub>4</sub>AF can be successfully synthesized via the SPCR method at 500 ℃ for 2 hours. The optimal raw material ratio by weight is <span class="mag-xml-inline-formula"> <math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="Mml5"> <mml:msub> <mml:mrow> <mml:mi>m</mml:mi></mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">C</mml:mi> <mml:mi mathvariant="normal">a</mml:mi> <mml:mo>(</mml:mo> <mml:mi mathvariant="normal">N</mml:mi> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi></mml:mrow> <mml:mrow> <mml:mn>3</mml:mn></mml:mrow></mml:msub> <mml:msub> <mml:mrow> <mml:mo>)</mml:mo></mml:mrow> <mml:mrow> <mml:mn>2</mml:mn></mml:mrow></mml:msub> <mml:mo>&#x000B7;</mml:mo> <mml:mn>4</mml:mn> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi></mml:mrow> <mml:mrow> <mml:mn>2</mml:mn></mml:mrow></mml:msub> <mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:msub></math></span>∶<span class="mag-xml-inline-formula"> <math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="Mml6"> <mml:msub> <mml:mrow> <mml:mi>m</mml:mi></mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">A</mml:mi> <mml:mi mathvariant="normal">l</mml:mi> <mml:mo>(</mml:mo> <mml:mi mathvariant="normal">N</mml:mi> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi></mml:mrow> <mml:mrow> <mml:mn>3</mml:mn></mml:mrow></mml:msub> <mml:msub> <mml:mrow> <mml:mo>)</mml:mo></mml:mrow> <mml:mrow> <mml:mn>3</mml:mn></mml:mrow></mml:msub> <mml:mo>&#x000B7;</mml:mo> <mml:mn>9</mml:mn> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi></mml:mrow> <mml:mrow> <mml:mn>2</mml:mn></mml:mrow></mml:msub> <mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:msub></math></span>∶<span class="mag-xml-inline-formula"> <math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="Mml7"> <mml:msub> <mml:mrow> <mml:mi>m</mml:mi></mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">F</mml:mi> <mml:mi mathvariant="normal">e</mml:mi> <mml:mo>(</mml:mo> <mml:mi mathvariant="normal">N</mml:mi> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi></mml:mrow> <mml:mrow> <mml:mn>3</mml:mn></mml:mrow></mml:msub> <mml:msub> <mml:mrow> <mml:mo>)</mml:mo></mml:mrow> <mml:mrow> <mml:mn>3</mml:mn></mml:mrow></mml:msub> <mml:mo>&#x000B7;</mml:mo> <mml:mn>9</mml:mn> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi></mml:mrow> <mml:mrow> <mml:mn>2</mml:mn></mml:mrow></mml:msub> <mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:msub></math></span>∶<span class="mag-xml-inline-formula"> <math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="Mml8"> <mml:msub> <mml:mrow> <mml:mi>m</mml:mi></mml:mrow> <mml:mrow> <mml:mi mathvariant="normal">C</mml:mi> <mml:mi mathvariant="normal">O</mml:mi> <mml:mo>(</mml:mo> <mml:mi mathvariant="normal">N</mml:mi> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi></mml:mrow> <mml:mrow> <mml:mn>2</mml:mn></mml:mrow></mml:msub> <mml:msub> <mml:mrow> <mml:mo>)</mml:mo></mml:mrow> <mml:mrow> <mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:msub></math></span>=1.259∶1.0∶1.077∶2.664. CaCO<sub>3</sub> is the only transient phase during the formation of C<sub>4</sub>AF. Increasing the urea dosage effectively raises reaction temperature and enhances the crystallinity of the synthesized C<sub>4</sub>AF. Additionally, the synthesized C<sub>4</sub>AF 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.</p>
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20230823