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The ammonium magnesium sulfate approach was employed to recover ammonia nitrogen from phosphogypsum leachate (PGL). The effects of acid type, reaction temperature, nitrogen-to-magnesium mole ratio (n(N): n(Mg)) and reaction time on the recovery rate of ammonia nitrogen were investigated. The results indicate that the magnesium ammonium sulfate method can efficiently recover ammonia nitrogen from PGL. And the most optimal reaction conditions were achieved at reaction temperature of 30 °C, reaction time of 2 h, n(N): n(Mg) of 1.5: 1. Under the above condition, the recovery rate of ammonia nitrogen from PGL can reach 99.15%, and its crystalline product magnesium ammonium sulfate can be used as sulfur fertilizer in farmland.

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A Novel Process for Ammonia Nitrogen Recovery from Phosphogypsum Leachate via Magnesium Ammonium Sulfate Approaches

  • 会议论文

  • 发表日期：

    2025年

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  • Lingfeng Li,
  • Chao Shen,
  • Yunhao Li,
  • Zhangli Chen,
  • Xiaolong Shi,
  • Changxin Li

摘要

The ammonium magnesium sulfate approach was employed to recover ammonia nitrogen from phosphogypsum leachate (PGL). The effects of acid type, reaction temperature, nitrogen-to-magnesium mole ratio (n(N): n(Mg)) and reaction time on the recovery rate of ammonia nitrogen were investigated. The results indicate that the magnesium ammonium sulfate method can efficiently recover ammonia nitrogen from PGL. And the most optimal reaction conditions were achieved at reaction temperature of 30 °C, reaction time of 2 h, n(N): n(Mg) of 1.5: 1. Under the above condition, the recovery rate of ammonia nitrogen from PGL can reach 99.15%, and its crystalline product magnesium ammonium sulfate can be used as sulfur fertilizer in farmland.