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This study presents a novel approach for producing aluminaAlumina from aluminum chloride hexahydrate (ACHAluminum Chloride Hexahydrate (ACH)), offering a simplified alternative to conventional two-step calcinationCalcination. This method integrates a controlled neutralization step with closed-loop acid recovery and allows single-step thermal treatment while minimizing hydrochloric acid release during calcinationCalcination. This significantly reduces equipment corrosion risks and removes the need for complex and expensive corrosion-resistant kilns typically required in conventional ACHAluminum Chloride Hexahydrate (ACH)-based production. ThermodynamicThermodynamics simulationSimulation using OLI Flowsheet was employed to investigate the neutralization of ACHAluminum Chloride Hexahydrate (ACH) with NaOH, examining aqueous speciation, aluminaAlumina hydrateHydrate precipitation (gibbsite/bayerite, Al(OH)3 and boehmiteBoehmite, AlOOH), and chloride partitioning as functions of NaOH dosage and temperature. These insights guided the experimental design by identifying conditions that favor effective neutralization and the initiation of aluminaAlumina hydrateHydrate nucleation. Laboratory validation confirmed that effective neutralization improves control over the purity of aluminaAlumina produced, phase evolution during calcinationCalcination and may contribute to circular chemical use through acid regeneration. Overall, this approach offers a cleaner, more efficient, and infrastructure-friendly pathway for high-purity aluminaAlumina production.

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A Novel Route to Phase-Controlled Alumina from Anorthosite via Single-Step Calcination

  • 会议论文

  • 发表日期：

    2026年

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  • Fernando Sitorus,
  • Saima Sultana Kazi,
  • Jean Patrick Pinheiro,
  • Duygu Yilmaz

摘要

This study presents a novel approach for producing aluminaAlumina from aluminum chloride hexahydrate (ACHAluminum Chloride Hexahydrate (ACH)), offering a simplified alternative to conventional two-step calcinationCalcination. This method integrates a controlled neutralization step with closed-loop acid recovery and allows single-step thermal treatment while minimizing hydrochloric acid release during calcinationCalcination. This significantly reduces equipment corrosion risks and removes the need for complex and expensive corrosion-resistant kilns typically required in conventional ACHAluminum Chloride Hexahydrate (ACH)-based production. ThermodynamicThermodynamics simulationSimulation using OLI Flowsheet was employed to investigate the neutralization of ACHAluminum Chloride Hexahydrate (ACH) with NaOH, examining aqueous speciation, aluminaAlumina hydrateHydrate precipitation (gibbsite/bayerite, Al(OH)3 and boehmiteBoehmite, AlOOH), and chloride partitioning as functions of NaOH dosage and temperature. These insights guided the experimental design by identifying conditions that favor effective neutralization and the initiation of aluminaAlumina hydrateHydrate nucleation. Laboratory validation confirmed that effective neutralization improves control over the purity of aluminaAlumina produced, phase evolution during calcinationCalcination and may contribute to circular chemical use through acid regeneration. Overall, this approach offers a cleaner, more efficient, and infrastructure-friendly pathway for high-purity aluminaAlumina production.