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<p>The deep purification of zinc sulfate electrolytes in zinc hydrometallurgy has long been a challenging issue, particularly regarding high zinc powder consumption and the stubborn removal of Co (II). This paper is based on the strong reducibility of sulfite, and a Na<sub>2</sub>SO<sub>3</sub>-assisted zinc powder deep purification method for advanced impurity removal has been proposed to achieve more efficient impurity removal. The parameters influencing impurity elimination were investigated to determine the optimal conditions of: Na<sub>2</sub>SO<sub>3</sub> 40&#xa0;mg/L, zinc powder 2.5&#xa0;mg/L, copper ion 44.39&#xa0;mg/L, and Sb<sub>2</sub>O<sub>3</sub> 5&#xa0;mg/L, compared with the experiment without Na<sub>2</sub>SO<sub>3</sub>. The cobalt ion was reduced from 0.2&#xa0;mg/L to 0.11&#xa0;mg/L, the degree of impurity removal from the ZnSO<sub>4</sub> solution improved by 45%, the dosage of Sb<sub>2</sub>O<sub>3</sub> decreased to 5&#xa0;mg/L, which was reduced by 50%, and the consumption of zinc powder decreased to 2.5&#xa0;g/L, which was reduced by 16.67%. The method exhibited expanded adaptability to variations in Sb<sub>2</sub>O<sub>3</sub> dosage and copper ion concentration. This innovative approach holds great potential for overcoming the long-standing obstacle of thoroughly removing deep impurities in zinc powder purification processes, representing a significant advancement in the field. The study provides a more efficient and energy-saving production approach for the metallurgical industry.</p>

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Synergistic Mechanism of Na2SO3 in Zinc Powder-Driven Deep Purification of ZnSO4 Solution

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Junchang Liu,
  • Jing Chen,
  • Xiaoqian Che,
  • Ailin Wen,
  • Cheng Jiang,
  • Wenyi Liu,
  • Chuanyu Li,
  • Jing Li,
  • Libo Zhang

摘要

The deep purification of zinc sulfate electrolytes in zinc hydrometallurgy has long been a challenging issue, particularly regarding high zinc powder consumption and the stubborn removal of Co (II). This paper is based on the strong reducibility of sulfite, and a Na2SO3-assisted zinc powder deep purification method for advanced impurity removal has been proposed to achieve more efficient impurity removal. The parameters influencing impurity elimination were investigated to determine the optimal conditions of: Na2SO3 40 mg/L, zinc powder 2.5 mg/L, copper ion 44.39 mg/L, and Sb2O3 5 mg/L, compared with the experiment without Na2SO3. The cobalt ion was reduced from 0.2 mg/L to 0.11 mg/L, the degree of impurity removal from the ZnSO4 solution improved by 45%, the dosage of Sb2O3 decreased to 5 mg/L, which was reduced by 50%, and the consumption of zinc powder decreased to 2.5 g/L, which was reduced by 16.67%. The method exhibited expanded adaptability to variations in Sb2O3 dosage and copper ion concentration. This innovative approach holds great potential for overcoming the long-standing obstacle of thoroughly removing deep impurities in zinc powder purification processes, representing a significant advancement in the field. The study provides a more efficient and energy-saving production approach for the metallurgical industry.