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<p>Nitric acid pressure leaching is anticipated to become the next-generation mainstream technology for limonitic laterite. Despite the perceived benefits of the pyrolysis process, realizing it poses a critical challenge. Therefore, atomization pyrolysis is proposed as a means to achieve the regeneration of nitric acid and magnesium oxide. In this study, the phase evolution, and regeneration mechanism were studied. Magnesium oxide was utilized as a precipitant to explore the precipitation characteristics of the elements and the filtration properties of the residue. The results indicate that, during atomized pyrolysis, the phase evolution follows magnesium nitrate hexahydrate → basic magnesium nitrate → magnesium oxide (hollow sphere). Under optimal conditions, the specific surface of magnesium oxide is 32.9&#xa0;m<sup>2</sup>/g (D50 = 6.42&#xa0;μm). Finally, a novel regeneration process is proposed: magnesium nitrate hexahydrate ultrasonic atomization pyrolysis–condensation–nitrogen oxides pressurized absorption.</p>

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Research on the Acid-Alkaline Regeneration Mechanism of Nitrate by Ultrasonic Atomization Pyrolysis in Nitric Acid Pressure Leaching Process

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Zhihe Cao,
  • Ding Zhao,
  • Baozhong Ma,
  • Yubo Liu,
  • Chengyan Wang,
  • Yongqiang Chen

摘要

Nitric acid pressure leaching is anticipated to become the next-generation mainstream technology for limonitic laterite. Despite the perceived benefits of the pyrolysis process, realizing it poses a critical challenge. Therefore, atomization pyrolysis is proposed as a means to achieve the regeneration of nitric acid and magnesium oxide. In this study, the phase evolution, and regeneration mechanism were studied. Magnesium oxide was utilized as a precipitant to explore the precipitation characteristics of the elements and the filtration properties of the residue. The results indicate that, during atomized pyrolysis, the phase evolution follows magnesium nitrate hexahydrate → basic magnesium nitrate → magnesium oxide (hollow sphere). Under optimal conditions, the specific surface of magnesium oxide is 32.9 m2/g (D50 = 6.42 μm). Finally, a novel regeneration process is proposed: magnesium nitrate hexahydrate ultrasonic atomization pyrolysis–condensation–nitrogen oxides pressurized absorption.