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<p>Considering the rising demand for low-carbon smelting, a carbon-free dry vibration mix based on <i>x</i>Mg(OH)<sub>2</sub>·<i>y</i>MgSO<sub>4</sub> was investigated, focusing on its structure evolution and bonding mechanism. Furthermore, the role of the bonding agents was evaluated in terms of their physical properties and corrosion resistance. The results revealed that heat treatment at 220&#xa0;°C led to the formation of a CaSO<sub>4</sub>–Mg(OH)<sub>2</sub>·2MgSO<sub>4</sub> structure, driven by chemical bonding and physical interlocking between the bonding agents. The cold modulus of rupture and compressive strength were 1.97 and 8.80&#xa0;MPa, respectively. Following sintering at 1550&#xa0;°C, the in-situ formation of MgAl<sub>2</sub>O<sub>4</sub> and Ca<sub>2</sub>SiO<sub>4</sub> further promoted sintering and significantly enhanced the high-temperature performance of the prepared mix. Moreover, the corrosion resistance of the carbon-free dry vibration mix improved (corrosion index fell from 42.85 to 23.20%) because of the role of the bonding agent in promoting sintering and densification, as well as increasing slag viscosity and reducing fluidity.</p> Graphical Abstract <p></p>

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Mechanism and Properties of Carbon-Free Bonded Dry Vibration Mix Based on CaSO4–Mg(OH)2·2MgSO4

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Shizhou Zhao,
  • Ao Huang,
  • Huazhi Gu,
  • Yongshun Zou

摘要

Considering the rising demand for low-carbon smelting, a carbon-free dry vibration mix based on xMg(OH)2·yMgSO4 was investigated, focusing on its structure evolution and bonding mechanism. Furthermore, the role of the bonding agents was evaluated in terms of their physical properties and corrosion resistance. The results revealed that heat treatment at 220 °C led to the formation of a CaSO4–Mg(OH)2·2MgSO4 structure, driven by chemical bonding and physical interlocking between the bonding agents. The cold modulus of rupture and compressive strength were 1.97 and 8.80 MPa, respectively. Following sintering at 1550 °C, the in-situ formation of MgAl2O4 and Ca2SiO4 further promoted sintering and significantly enhanced the high-temperature performance of the prepared mix. Moreover, the corrosion resistance of the carbon-free dry vibration mix improved (corrosion index fell from 42.85 to 23.20%) because of the role of the bonding agent in promoting sintering and densification, as well as increasing slag viscosity and reducing fluidity.

Graphical Abstract