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<p>During the blast furnace iron smelting process, the properties of acidic slags are critical to maintaining stable furnace operation. Viscosity, a key slag property, directly influences this stability. However, there is an extreme lack of research on the viscosity behavior and structural characteristics of acidic slag. The effects of <i>w</i>(MgO)/<i>w</i>(Al<sub>2</sub>O<sub>3</sub>) (M/A, 0.41–0.86) and FeO content (30–45&#xa0;wt.%) on the viscosity and structural properties of CaO–MgO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–FeO slag with a basicity of 0.06 were investigated. The results indicated that both the breaking temperature (<i>T</i><sub>b</sub>) and the flow activation energy (<i>E</i><sub><i>η</i></sub>) decreased initially and then increased with rising M/A, reaching minima at M/A of 0.71, with values of 1523&#xa0;K and 45&#xa0;kJ&#xa0;mol<sup>−1</sup>, respectively. When FeO content was increased from 30 to 45&#xa0;wt.%, <i>T</i><sub>b</sub> decreased from 1696 to 1552&#xa0;K, and <i>E</i><sub><i>η</i></sub> decreased from 65.24 to 35.94&#xa0;kJ&#xa0;mol<sup>−1</sup>. Raman spectroscopic analysis revealed that the primary cause of viscosity reduction was depolymerization of the silicate network. Increasing M/A or FeO content promoted the breakdown of Q<sup>3</sup> units into lower-order Q<sup><i>n</i></sup> species (Q<sup>0</sup>–Q<sup>2</sup>), with a pronounced increase in the Q<sup>1</sup> fraction from 27 to 42&#xa0;mol% at M/A of 0.71. This structural evolution elevated the non-bridging oxygen per silicon, thereby reducing melt viscosity. However, when M/A exceeded 0.71, re-polymerization of Q<sup>3</sup> units occurred, leading to a subsequent increase in viscosity.</p>

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Effects of w(MgO)/w(Al2O3) and FeO on viscosity and structure of CaO–MgO–Al2O3–SiO2–FeO slag

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Hong-Man He,
  • Ting-Le Li,
  • Ming-Xin Wu,
  • Qi Wang,
  • Chang-Yu Sun,
  • Jun-Chen Huang,
  • Liang-Ping Xu,
  • Yong-Qiang Jiang,
  • Guang-Hui Li

摘要

During the blast furnace iron smelting process, the properties of acidic slags are critical to maintaining stable furnace operation. Viscosity, a key slag property, directly influences this stability. However, there is an extreme lack of research on the viscosity behavior and structural characteristics of acidic slag. The effects of w(MgO)/w(Al2O3) (M/A, 0.41–0.86) and FeO content (30–45 wt.%) on the viscosity and structural properties of CaO–MgO–Al2O3–SiO2–FeO slag with a basicity of 0.06 were investigated. The results indicated that both the breaking temperature (Tb) and the flow activation energy (Eη) decreased initially and then increased with rising M/A, reaching minima at M/A of 0.71, with values of 1523 K and 45 kJ mol−1, respectively. When FeO content was increased from 30 to 45 wt.%, Tb decreased from 1696 to 1552 K, and Eη decreased from 65.24 to 35.94 kJ mol−1. Raman spectroscopic analysis revealed that the primary cause of viscosity reduction was depolymerization of the silicate network. Increasing M/A or FeO content promoted the breakdown of Q3 units into lower-order Qn species (Q0–Q2), with a pronounced increase in the Q1 fraction from 27 to 42 mol% at M/A of 0.71. This structural evolution elevated the non-bridging oxygen per silicon, thereby reducing melt viscosity. However, when M/A exceeded 0.71, re-polymerization of Q3 units occurred, leading to a subsequent increase in viscosity.