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A potential approach to reduce the environmental impactEnvironmental Impact of copper extractionCopper extraction and concrete production is utilizing iron silicate slagIron silicate slag as a supplementary cementitious material (SCMSupplementary Cementitious Material (SCM)) since it enhances resource efficiencyResource efficiency and decreases CO2 emissionsEmissions per ton of cementitious material. To be utilized as an SCMSupplementary Cementitious Material (SCM), the slagSlag must have an amorphous structure, which can be achieved by water granulationWater granulation. However, water granulationWater granulation is a water-intensive process that requires access to water and water purification, which makes air granulationAir granulation an interesting alternative cooling methodCooling methods. For iron silicate slagsIron silicate slag, there is limited knowledge of whether air granulationAir granulation can generate a slagSlag with amorphous content comparable with water-granulated iron silicate slagsIron silicate slag and if possible structural variances in the amorphous structure might affect its reactivity and potential use as an SCMSupplementary Cementitious Material (SCM). Therefore, this study investigates the amorphous content and reactivity of an industrial iron silicate slagIron silicate slag sample subjected to air and water granulationWater granulation. The slagSlag sample was first water granulated on an industrial scale followed by remelting before water and air granulationAir granulation at a laboratory scale. The amorphous content of the three samples was studied using X-ray diffraction (XRD), and their reactivities were measured using R3 isothermal calorimeter testing. The XRD results showed that water granulationWater granulation on both an industrial and laboratory scale generated a fully amorphous slagSlag while the air-granulated slagSlag had a minor formationFormation of crystalline phases. Results from the R3 measurements showed that the water-granulated slagsSlag generated more heat after seven days than the air-granulated slagSlag.

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Comparison of the Reactivities of Air- and Water-Granulated Iron Silicate Slag as Supplementary Cementitious Material

  • 会议论文

  • 发表日期：

    2025年

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  • Elin Lundmark,
  • Jenny Isaksson,
  • Åke Roos,
  • Andreas Lennartsson,
  • Fredrik Engström,
  • Anton Andersson

摘要

A potential approach to reduce the environmental impactEnvironmental Impact of copper extractionCopper extraction and concrete production is utilizing iron silicate slagIron silicate slag as a supplementary cementitious material (SCMSupplementary Cementitious Material (SCM)) since it enhances resource efficiencyResource efficiency and decreases CO2 emissionsEmissions per ton of cementitious material. To be utilized as an SCMSupplementary Cementitious Material (SCM), the slagSlag must have an amorphous structure, which can be achieved by water granulationWater granulation. However, water granulationWater granulation is a water-intensive process that requires access to water and water purification, which makes air granulationAir granulation an interesting alternative cooling methodCooling methods. For iron silicate slagsIron silicate slag, there is limited knowledge of whether air granulationAir granulation can generate a slagSlag with amorphous content comparable with water-granulated iron silicate slagsIron silicate slag and if possible structural variances in the amorphous structure might affect its reactivity and potential use as an SCMSupplementary Cementitious Material (SCM). Therefore, this study investigates the amorphous content and reactivity of an industrial iron silicate slagIron silicate slag sample subjected to air and water granulationWater granulation. The slagSlag sample was first water granulated on an industrial scale followed by remelting before water and air granulationAir granulation at a laboratory scale. The amorphous content of the three samples was studied using X-ray diffraction (XRD), and their reactivities were measured using R3 isothermal calorimeter testing. The XRD results showed that water granulationWater granulation on both an industrial and laboratory scale generated a fully amorphous slagSlag while the air-granulated slagSlag had a minor formationFormation of crystalline phases. Results from the R3 measurements showed that the water-granulated slagsSlag generated more heat after seven days than the air-granulated slagSlag.