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<p>The influences of substituting K<sub>2</sub>O for Na<sub>2</sub>O on viscous properties and structures of SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–MgO–CaO–Fe<sub>2</sub>O<sub>3</sub>–Na<sub>2</sub>O–K<sub>2</sub>O coal slags were researched in this study. With the substitution of Na<sub>2</sub>O by K<sub>2</sub>O in slags, the viscosity of the coal slag gradually increased, and the activation energy raised from 178.80 to 197.96&#xa0;kJ/mol, indicating the slag structure became polymerized and the movement resistance of flow units slightly increased. According to the results of Raman and <sup>27</sup>Al NMR spectra, when the Na<sub>2</sub>O was substituted by the same mass content of K<sub>2</sub>O, the silicate structure became more complicated due to the introducing of K<sup>+</sup> ions and the decreasing content of O<sup>2−</sup> ions, and the aluminate structure was polymerized because of the higher strength of Al–O bond in AlO<sub>4</sub> units combined with K<sup>+</sup> ions. Furthermore, the total diffusivity of the coal slag was gradually lowered with the substitution of Na<sub>2</sub>O by K<sub>2</sub>O. The comprehensive effects eventually polymerized the slag structure and resulted in an increase in viscosity.</p>

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Viscous Properties and Structures of SiO2–CaO–Al2O3–MgO–Fe2O3-Based Coal Slags with Substituting K2O for Na2O

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Renze Xu,
  • Zhen Wang

摘要

The influences of substituting K2O for Na2O on viscous properties and structures of SiO2–Al2O3–MgO–CaO–Fe2O3–Na2O–K2O coal slags were researched in this study. With the substitution of Na2O by K2O in slags, the viscosity of the coal slag gradually increased, and the activation energy raised from 178.80 to 197.96 kJ/mol, indicating the slag structure became polymerized and the movement resistance of flow units slightly increased. According to the results of Raman and 27Al NMR spectra, when the Na2O was substituted by the same mass content of K2O, the silicate structure became more complicated due to the introducing of K+ ions and the decreasing content of O2− ions, and the aluminate structure was polymerized because of the higher strength of Al–O bond in AlO4 units combined with K+ ions. Furthermore, the total diffusivity of the coal slag was gradually lowered with the substitution of Na2O by K2O. The comprehensive effects eventually polymerized the slag structure and resulted in an increase in viscosity.