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<p>A novel process, including MnO<sub>2</sub>-assisted oxidative leaching and selective zinc solvent extraction, has been developed to produce zinc cathode and manganese salts. Thus, MnO<sub>2</sub> and ZnS concentrate was leached with sulfuric acid, 2&#xa0;mol/L, at 85°C for 5&#xa0;h. Consequently, 85% of zinc was leached, producing a filtrate containing Zn 26.20&#xa0;g/L and Mn 30.37&#xa0;g/L. The zinc separation from a concentrated manganese solution was proposed based on solvent extraction using D2EHPA. In the extraction stage, 86.58% of zinc was loaded using 30% v/v D2EHPA, whereas 99.35% of manganese remained in the raffinate (Mn 29&#xa0;g/L). By-products of manganese were produced from the raffinate. Then, a scrub solution containing 0.15&#xa0;mol/L H<sub>2</sub>SO<sub>4</sub> and 8.50&#xa0;g/Zn L at an aqueous-to-organic ratio of 1:10 scrubbed Mn, Ni, Co, Cd, and Fe from the loaded organic. Finally, a two-stage batch counter-current stripping was carried out. Finally, an aqueous solution was obtained, which was acceptable for zinc electrolysis. Since MnO<sub>2</sub> is recycled as a profitable product (MnCO<sub>3</sub>) in this integrated process, it can be considered more efficient and sustainable than other processes. Low SO<sub>2</sub> emissions, low iron content in residues, no requirement for pure oxygen, and safer processes make this process environment-friendly compared to pressure and roasting processes.</p>

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A New Solvent Extraction Process for Zinc Cathode and Manganese Salt Production from ZnS Concentrates

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Hossein Kamran Haghighi,
  • Mehdi Irannajad

摘要

A novel process, including MnO2-assisted oxidative leaching and selective zinc solvent extraction, has been developed to produce zinc cathode and manganese salts. Thus, MnO2 and ZnS concentrate was leached with sulfuric acid, 2 mol/L, at 85°C for 5 h. Consequently, 85% of zinc was leached, producing a filtrate containing Zn 26.20 g/L and Mn 30.37 g/L. The zinc separation from a concentrated manganese solution was proposed based on solvent extraction using D2EHPA. In the extraction stage, 86.58% of zinc was loaded using 30% v/v D2EHPA, whereas 99.35% of manganese remained in the raffinate (Mn 29 g/L). By-products of manganese were produced from the raffinate. Then, a scrub solution containing 0.15 mol/L H2SO4 and 8.50 g/Zn L at an aqueous-to-organic ratio of 1:10 scrubbed Mn, Ni, Co, Cd, and Fe from the loaded organic. Finally, a two-stage batch counter-current stripping was carried out. Finally, an aqueous solution was obtained, which was acceptable for zinc electrolysis. Since MnO2 is recycled as a profitable product (MnCO3) in this integrated process, it can be considered more efficient and sustainable than other processes. Low SO2 emissions, low iron content in residues, no requirement for pure oxygen, and safer processes make this process environment-friendly compared to pressure and roasting processes.