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<p>Spent steel pickling liquor poses a significant threat to ecological safety due to its high acidity and the presence of heavy metals. An electrochemical combined reverse co-precipitation method was employed to treat spent steel pickling liquor and recover iron as magnetite (Fe<sub>3</sub>O<sub>4</sub>). The effects of reaction parameters on the purity of magnetite were investigated, including initial pH (10.50), reaction temperature (45&#xa0;°C), current density (50&#xa0;mA cm<sup>−2</sup>), reaction time (110&#xa0;min), pH stabilization time (50&#xa0;min), and stirring speed (600 r min<sup>−1</sup>). Under optimal conditions, a Fe<sub>3</sub>O<sub>4</sub> purity of 97.62% was achieved. Furthermore, the synthesis mechanism involved partial oxidation of Fe<sup>2+</sup> to Fe<sup>3+</sup> at the anode, followed by reaction with hydroxide ions to form Fe<sub>3</sub>O<sub>4</sub>.</p> Graphical abstract <p></p>

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Novel approach to magnetite synthesis from spent steel pickling liquor through electrochemical combined reverse co-precipitation

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Jie Fang,
  • Shifan Wang,
  • Guangtuan Huang

摘要

Spent steel pickling liquor poses a significant threat to ecological safety due to its high acidity and the presence of heavy metals. An electrochemical combined reverse co-precipitation method was employed to treat spent steel pickling liquor and recover iron as magnetite (Fe3O4). The effects of reaction parameters on the purity of magnetite were investigated, including initial pH (10.50), reaction temperature (45 °C), current density (50 mA cm−2), reaction time (110 min), pH stabilization time (50 min), and stirring speed (600 r min−1). Under optimal conditions, a Fe3O4 purity of 97.62% was achieved. Furthermore, the synthesis mechanism involved partial oxidation of Fe2+ to Fe3+ at the anode, followed by reaction with hydroxide ions to form Fe3O4.

Graphical abstract