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Reactive silica in bauxite causes the loss of soda associated with the precipitated Desilication Products (DSP) during the Bayer process. The DSPs belong to low aluminiumAluminium to silicon ratio zeolites, such as amorphous phase, zeolite LTA, and sodalite. Due to the zeolites’ microporous properties, they have many applications within various fields such as in laundry detergents, ion exchange, and metalMetals adsorption in solution. In this study, the synthesized three types of DSPs (amorphous phase, zeolite LTA, and sodalite) were used as adsorbents for metalMetals ions (Cu2+, Pb2+, and Co2+) removalRemoval in simulated mine wasteMine waste streams. The results show that the amorphous phase exhibits the highest adsorption capacity for all metalMetals ions tested. For mixed metalMetals ion solution, sodalite shows the highest selectivity for Pb2+ against Cu2+and Co2+ with separation factor values of 18 and 5.7, respectively. These findings may benefit the aluminaAlumina industryIndustry in identifying practical applications for wasteExtraction and processing such as high-performance adsorbents.

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Metal Recovery from Waste Using Bayer Process Desilication Products

  • 会议论文

  • 发表日期：

    2025年

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  • Hong Peng,
  • James Vaughan,
  • Tae Young Kim

摘要

Reactive silica in bauxite causes the loss of soda associated with the precipitated Desilication Products (DSP) during the Bayer process. The DSPs belong to low aluminiumAluminium to silicon ratio zeolites, such as amorphous phase, zeolite LTA, and sodalite. Due to the zeolites’ microporous properties, they have many applications within various fields such as in laundry detergents, ion exchange, and metalMetals adsorption in solution. In this study, the synthesized three types of DSPs (amorphous phase, zeolite LTA, and sodalite) were used as adsorbents for metalMetals ions (Cu2+, Pb2+, and Co2+) removalRemoval in simulated mine wasteMine waste streams. The results show that the amorphous phase exhibits the highest adsorption capacity for all metalMetals ions tested. For mixed metalMetals ion solution, sodalite shows the highest selectivity for Pb2+ against Cu2+and Co2+ with separation factor values of 18 and 5.7, respectively. These findings may benefit the aluminaAlumina industryIndustry in identifying practical applications for wasteExtraction and processing such as high-performance adsorbents.