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The particle size distributionParticle size distribution (PSD) control of gibbsite particles during seeded hydrateHydrate precipitation in the Bayer processBayer process is important for ensuring high-qualityQuality aluminaAlumina. Various factors, including fill temperature, seed charge, sodium oxalate precipitation, etc., can influence PSD of gibbsite product. Oxalate co-crystallization with aluminaAlumina trihydrate may result in poor aluminaAlumina product qualityQuality, such as finer PSD, increased occluded soda, a worse attrition index, and potentially reduced productivity. To address these challenges, Syensqo has developed an aqueous crystal growth modifier (CGMCrystal Growth Modifier (CGM)) to control the PSD of gibbsite via reducing the oxalate co-precipitation. This new CGMCrystal Growth Modifier (CGM) can exit the Bayer processBayer process by adsorbing to oxalate and can be destroyed during bauxiteBauxite digestionDigestion. This innovation improves the PSD of precipitated hydrateHydrate crystals via reducing oxalate co-precipitation, thereby enhancing process controlProcess control, product qualityQuality, and precipitation yield.

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Development of Syensqo’s Aqueous Crystal Growth Modifier (CGM) with Oxalate Stabilization Property for Bayer Process

  • 会议论文

  • 发表日期：

    2026年

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  • Airong Song,
  • Ruzi Zhang,
  • Zhiyun Liu

摘要

The particle size distributionParticle size distribution (PSD) control of gibbsite particles during seeded hydrateHydrate precipitation in the Bayer processBayer process is important for ensuring high-qualityQuality aluminaAlumina. Various factors, including fill temperature, seed charge, sodium oxalate precipitation, etc., can influence PSD of gibbsite product. Oxalate co-crystallization with aluminaAlumina trihydrate may result in poor aluminaAlumina product qualityQuality, such as finer PSD, increased occluded soda, a worse attrition index, and potentially reduced productivity. To address these challenges, Syensqo has developed an aqueous crystal growth modifier (CGMCrystal Growth Modifier (CGM)) to control the PSD of gibbsite via reducing the oxalate co-precipitation. This new CGMCrystal Growth Modifier (CGM) can exit the Bayer processBayer process by adsorbing to oxalate and can be destroyed during bauxiteBauxite digestionDigestion. This innovation improves the PSD of precipitated hydrateHydrate crystals via reducing oxalate co-precipitation, thereby enhancing process controlProcess control, product qualityQuality, and precipitation yield.