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Industrial by-products and wastes have gained increased interest for use as secondary resources in construction materials. Ferrochrome (FeCr) slag is classified as hazardous material due to Cr content, which restricts its use in green construction materials. Here, it was investigated if an electrodialytic treatment method could be applied to detoxify the FeCr slag from a South African smelter. Six electrodialytic experiments were done with varying experimental conditions: duration, applied current, and cell set-up. The highest Cr removal was 16% from the FeCr slag when using the longest remediation time combined with a high current. However, Cr leaching exceeded the regulatory limits after this experiment. The Cr leaching decreased significantly after all other electrodialytic experiments, which shows the potential for this method to detoxify FeCr slag and the potential use in construction materials, if the right experimental conditions during the electrodialytic treatment are chosen.

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Detoxification of Ferrochrome Slag by Removing Cr with an Electrodialytic Method

  • 会议论文

  • 发表日期：

    2026年

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  • Gunvor M. Kirkelund,
  • Ana T. M. Lima,
  • Thabo Falayi,
  • Tebogo Mashifana,
  • Freeman Ntuli

摘要

Industrial by-products and wastes have gained increased interest for use as secondary resources in construction materials. Ferrochrome (FeCr) slag is classified as hazardous material due to Cr content, which restricts its use in green construction materials. Here, it was investigated if an electrodialytic treatment method could be applied to detoxify the FeCr slag from a South African smelter. Six electrodialytic experiments were done with varying experimental conditions: duration, applied current, and cell set-up. The highest Cr removal was 16% from the FeCr slag when using the longest remediation time combined with a high current. However, Cr leaching exceeded the regulatory limits after this experiment. The Cr leaching decreased significantly after all other electrodialytic experiments, which shows the potential for this method to detoxify FeCr slag and the potential use in construction materials, if the right experimental conditions during the electrodialytic treatment are chosen.