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<p>This study introduces a novel neutralization hydrolysis method to remove iron from zinc sulfate solutions using ZnO as a neutralizer under low temperature. The influence of reaction factors such as feeding method, solution pH, and reaction time on iron removal efficiency was investigated in detail. Compared to positive feeding addition, the iron removal precipitate obtained with parallel feeding addition had larger particle size, regular morphology, and a settling rate of 1.88&#xa0;mm/min within the initial 10&#xa0;min. Under the optimized conditions of using parallel feeding addition, maintaining solution pH 3.10–3.20, and operating at 70°C for 5&#xa0;h, the iron concentration in the solution reduced from 11.45&#xa0;g/L to 10&#xa0;ppm, achieving a remarkable iron removal ratio of 99.95% with a zinc loss ratio of only 0.10%. The main phase of iron removal precipitate is iron oxide hydrate, containing a certain amount of amorphous FeOOH. The separation performance of the iron removal precipitate could be enhanced by adjusting its particle size and employing flocculants.</p>

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Iron Removal from Zinc Sulfate Solution by Neutralization Hydrolysis Method Using ZnO as a Neutralizer

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Zhihong Peng,
  • Jinwei Meng,
  • Fang He,
  • Yilin Wang,
  • Tiangui Qi,
  • Leiting Shen

摘要

This study introduces a novel neutralization hydrolysis method to remove iron from zinc sulfate solutions using ZnO as a neutralizer under low temperature. The influence of reaction factors such as feeding method, solution pH, and reaction time on iron removal efficiency was investigated in detail. Compared to positive feeding addition, the iron removal precipitate obtained with parallel feeding addition had larger particle size, regular morphology, and a settling rate of 1.88 mm/min within the initial 10 min. Under the optimized conditions of using parallel feeding addition, maintaining solution pH 3.10–3.20, and operating at 70°C for 5 h, the iron concentration in the solution reduced from 11.45 g/L to 10 ppm, achieving a remarkable iron removal ratio of 99.95% with a zinc loss ratio of only 0.10%. The main phase of iron removal precipitate is iron oxide hydrate, containing a certain amount of amorphous FeOOH. The separation performance of the iron removal precipitate could be enhanced by adjusting its particle size and employing flocculants.