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The valorization of copper smeltingCopper Smelting slagSlag as a supplementary cementitious materialSupplementary cementitious material (SCMsSupplementary Cementitious Material (SCM)) improves raw material efficiencyEfficiency in copper smeltingCopper Smelting and reduces CO2 emissionsEmissions from the cement industry. A critical factor for SCMSupplementary Cementitious Material (SCM) performancePerformance is the amorphous content, which is influenced by the cooling methodCooling methods, coolingCooling rate, and composition. This study investigated the FeO/SiO2 ratio (1.1 and 1.3 mol%/mol%) and CaO contents (1.3 and 12 mol%) influence on the crystallizationCrystallization, viscosityViscosity, and inherent reactivity within the FeO-SiO2-Al2O3-CaO-MgO system. A hot-stage confocal laser scanning microscope was used to examine the crystallizationCrystallization behavior under continuous coolingCooling conditions. In addition, the viscosityViscosity regarding crystallizationCrystallization tendencies was measured and evaluated. The findings demonstrated that increasing the FeO/SiO2 ratio and CaO content reduced melt viscosityViscosity, promoting faster crystallizationCrystallization and imposing stricter demandsDemand on the coolingCooling rate to maintain the amorphous structure in the material. Moreover, reactivity tests on water-granulated samples revealed that a higher FeO/SiO2 ratio and CaO content decreased the reactivity in the evaluated intervals.

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Viscosity, Crystallization, and Inherent Reactivity of Copper Slag in Cementitious Systems: FeO/SiO2 Ratio and CaO Content

  • 会议论文

  • 发表日期：

    2025年

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  • Jenny Isaksson,
  • Anton Andersson,
  • Mohamed Elsadek,
  • Anderas Lennartsson,
  • Åke Roos,
  • Fredrik Engström

摘要

The valorization of copper smeltingCopper Smelting slagSlag as a supplementary cementitious materialSupplementary cementitious material (SCMsSupplementary Cementitious Material (SCM)) improves raw material efficiencyEfficiency in copper smeltingCopper Smelting and reduces CO2 emissionsEmissions from the cement industry. A critical factor for SCMSupplementary Cementitious Material (SCM) performancePerformance is the amorphous content, which is influenced by the cooling methodCooling methods, coolingCooling rate, and composition. This study investigated the FeO/SiO2 ratio (1.1 and 1.3 mol%/mol%) and CaO contents (1.3 and 12 mol%) influence on the crystallizationCrystallization, viscosityViscosity, and inherent reactivity within the FeO-SiO2-Al2O3-CaO-MgO system. A hot-stage confocal laser scanning microscope was used to examine the crystallizationCrystallization behavior under continuous coolingCooling conditions. In addition, the viscosityViscosity regarding crystallizationCrystallization tendencies was measured and evaluated. The findings demonstrated that increasing the FeO/SiO2 ratio and CaO content reduced melt viscosityViscosity, promoting faster crystallizationCrystallization and imposing stricter demandsDemand on the coolingCooling rate to maintain the amorphous structure in the material. Moreover, reactivity tests on water-granulated samples revealed that a higher FeO/SiO2 ratio and CaO content decreased the reactivity in the evaluated intervals.