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<p>A novel method was developed to valorize ferronickel slag through a series process by producing two functional products, nano silica and heavy metals adsorbent. This approach significantly contributes to the circular economy primarily for ferronickel industry by reducing the huge volume of slag generated from increasing ferronickel productions and mitigating potential risks to the environment. Ferronickel slag (± 149&#xa0;µm) was subjected to a hydrothermal process with 14&#xa0;M NaOH solution at 220&#xa0;°C for 120&#xa0;min, resulting in Si-rich filtrate and a solid residue. The filtrate was precipitated to obtain high purity nano silica, while the residue served as an adsorbent. The optimum condition provided a nano silica product with an average particle size of 62.85 ± 4.34&#xa0;nm and SiO<sub>2</sub> concentration of 95.30%. Adsorption test using the immersion method showed an exceptional result in artificial heavy metal waste (AHW 1 and AHW 2). While the hydrothermal residue displayed amphoteric adsorption properties, RH 700 demonstrated superior performance for cationic heavy metals capture. This process offers an efficient pathway for converting an abundant industrial by-product into high-value, eco-friendly materials, contributing both to resource recovery and environmental protection.</p> Graphical Abstract <p></p>

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A Novel Method in Valorization of Ferronickel Slag as Nano Silica and Heavy Metals Amphoteric Adsorbent by Hydrothermal Process

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Wahyu Mayangsari,
  • Aga Ridhova,
  • Shifa Salsa Bila,
  • Arival Jefry,
  • Kahlil Lukmanul Akmal,
  • Eni Febriana,
  • Agus Budi Prasetyo,
  • Reza Miftahul Ulum,
  • Azizah Intan Pangesty,
  • Johny Wahyuadi Soedarsono

摘要

A novel method was developed to valorize ferronickel slag through a series process by producing two functional products, nano silica and heavy metals adsorbent. This approach significantly contributes to the circular economy primarily for ferronickel industry by reducing the huge volume of slag generated from increasing ferronickel productions and mitigating potential risks to the environment. Ferronickel slag (± 149 µm) was subjected to a hydrothermal process with 14 M NaOH solution at 220 °C for 120 min, resulting in Si-rich filtrate and a solid residue. The filtrate was precipitated to obtain high purity nano silica, while the residue served as an adsorbent. The optimum condition provided a nano silica product with an average particle size of 62.85 ± 4.34 nm and SiO2 concentration of 95.30%. Adsorption test using the immersion method showed an exceptional result in artificial heavy metal waste (AHW 1 and AHW 2). While the hydrothermal residue displayed amphoteric adsorption properties, RH 700 demonstrated superior performance for cationic heavy metals capture. This process offers an efficient pathway for converting an abundant industrial by-product into high-value, eco-friendly materials, contributing both to resource recovery and environmental protection.

Graphical Abstract