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<p>Battery manufacturing industries in Korea generate substantial volume of wastewater containing lithium and boron. Conventional recovery technologies prioritize lithium, while boron is discharged to the effluent stream, posing ecological and human health risks at elevated concentrations. To address this, a selective ion exchange process was developed using Amberlite IRA743 (Dupont) resin. Efficient recovery of boron as boric acid was achieved by systematically optimizing adsorption, elution, concentration, and precipitation conditions. Under optimized conditions, the resin achieved a boron loading capacity of 2.069&#xa0;g B/L, producing a raffinate stream essentially devoid of boron (&lt; 5&#xa0;mg/L). Importantly, over 99.0% of lithium was retained in the raffinate, thereby ensuring subsequent recovery of lithium and sodium sulfate. Across eight consecutive regeneration cycles, resin performance remained consistent, with loading and elusion efficiencies varying between 96.0 and 99.7% and 93.8–97.2%, respectively. Boric acid of 99.86% purity was synthesized via a two-stage cooling and crystallization process, with sulfate detected as the only impurity detected in the product. Integrating boron and lithium recovery offers a sustainable pathway to mitigate environmental hazards while enabling resource valorization in the battery sector.</p>

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Selective Ion Exchange Recovery of Boron as Boric Acid From Battery Manufacturing Industry Wastewater

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Debasish Mohapatra,
  • Yong-Ho Lee,
  • Hong-In Kim

摘要

Battery manufacturing industries in Korea generate substantial volume of wastewater containing lithium and boron. Conventional recovery technologies prioritize lithium, while boron is discharged to the effluent stream, posing ecological and human health risks at elevated concentrations. To address this, a selective ion exchange process was developed using Amberlite IRA743 (Dupont) resin. Efficient recovery of boron as boric acid was achieved by systematically optimizing adsorption, elution, concentration, and precipitation conditions. Under optimized conditions, the resin achieved a boron loading capacity of 2.069 g B/L, producing a raffinate stream essentially devoid of boron (< 5 mg/L). Importantly, over 99.0% of lithium was retained in the raffinate, thereby ensuring subsequent recovery of lithium and sodium sulfate. Across eight consecutive regeneration cycles, resin performance remained consistent, with loading and elusion efficiencies varying between 96.0 and 99.7% and 93.8–97.2%, respectively. Boric acid of 99.86% purity was synthesized via a two-stage cooling and crystallization process, with sulfate detected as the only impurity detected in the product. Integrating boron and lithium recovery offers a sustainable pathway to mitigate environmental hazards while enabling resource valorization in the battery sector.