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<p>Aluminium dross as a by-product of the aluminium industry is a hazardous waste that presents a challenge to the environment and economic undertakings because of its composition. This work focuses on the valorization of aluminium dross, together with lime sludge used in the paper industry, to obtain a calcium aluminate-rich synthetic slag, which can be used in secondary steelmaking. Pelletisation and controlled sintering to temperatures up to 1300&#xa0;°C were carried out on the mixture. According to x-ray diffraction (XRD), incompletely developed calcium aluminate phases, specifically 12CaO.7Al<sub>2</sub>O<sub>3</sub> (C12A7, also called mayenite) were identified in addition to calcium aluminate silicates, silicates of calcium &amp; iron and metallic aluminium. The sintered blend of aluminium dross and sludge has a chemical and phase performance comparable to synthetic slags in desulphurization that shows technical capability and environmental advantages of this type of industrial symbiosis. The work will help in sustainable steelmaking while utilising hazardous waste being converted to value-added products.</p>

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Production of synthetic slag from aluminium dross for steelmaking: a study on waste valorization and industrial symbiosis

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Ram Narayan Chouhan,
  • Anil Kumar Ramavajjala,
  • Ajay Kujur,
  • Sandip Roy,
  • Rajesh Khatirkar,
  • Dilip Peshwe,
  • Anupam Agnihotri

摘要

Aluminium dross as a by-product of the aluminium industry is a hazardous waste that presents a challenge to the environment and economic undertakings because of its composition. This work focuses on the valorization of aluminium dross, together with lime sludge used in the paper industry, to obtain a calcium aluminate-rich synthetic slag, which can be used in secondary steelmaking. Pelletisation and controlled sintering to temperatures up to 1300 °C were carried out on the mixture. According to x-ray diffraction (XRD), incompletely developed calcium aluminate phases, specifically 12CaO.7Al2O3 (C12A7, also called mayenite) were identified in addition to calcium aluminate silicates, silicates of calcium & iron and metallic aluminium. The sintered blend of aluminium dross and sludge has a chemical and phase performance comparable to synthetic slags in desulphurization that shows technical capability and environmental advantages of this type of industrial symbiosis. The work will help in sustainable steelmaking while utilising hazardous waste being converted to value-added products.