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<p>Potassium manganate (K<sub>2</sub>MnO<sub>4</sub>) is a key intermediate in potassium permanganate production, stable only under highly alkaline conditions. This study introduces a novel method using KOH sub-molten salt as the reaction medium and pyrolusite as the raw material. The effects of KOH concentration, reaction time, temperature, and alkali-to-manganese ratio on phase transitions were investigated. XRD, SEM, FTIR and XPS analyses revealed the manganese transformation sequence: MnO<sub>2</sub> → MnO<sub>4</sub><sup>3−</sup> → MnO<sub>4</sub><sup>2−</sup>. Active oxygen species (O<sup>2−</sup>, O<sub>2</sub><sup>2−</sup>) generated by OH⁻ dissociation under oxygen pressure significantly accelerated pyrolusite decomposition and oxidation. This green and efficient approach reduces energy consumption and hazardous byproducts, providing a sustainable method for potassium manganate synthesis. The findings offer valuable insights into optimizing industrial production of potassium-based compounds.</p> Graphical Abstract <p></p>

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Study on Phase Transformation of Potassium Manganate Prepared By KOH Sub-molten Salt Method

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Wen Liu,
  • Yang Jiang,
  • Jijiang Huang,
  • Wenlie Li,
  • Jing Li,
  • Run Huang,
  • Hongyan Xie

摘要

Potassium manganate (K2MnO4) is a key intermediate in potassium permanganate production, stable only under highly alkaline conditions. This study introduces a novel method using KOH sub-molten salt as the reaction medium and pyrolusite as the raw material. The effects of KOH concentration, reaction time, temperature, and alkali-to-manganese ratio on phase transitions were investigated. XRD, SEM, FTIR and XPS analyses revealed the manganese transformation sequence: MnO2 → MnO43− → MnO42−. Active oxygen species (O2−, O22−) generated by OH⁻ dissociation under oxygen pressure significantly accelerated pyrolusite decomposition and oxidation. This green and efficient approach reduces energy consumption and hazardous byproducts, providing a sustainable method for potassium manganate synthesis. The findings offer valuable insights into optimizing industrial production of potassium-based compounds.

Graphical Abstract