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<p>Recovering a strategic metal like nickel from secondary resources has attracted much interest due to its growing demand, depleting high-grade ores, and increasing prices. Steam reforming catalysts based on nickel play vital roles in the production processes of gases. After certain operations, these catalysts become inactive and are disposed of as hazardous solid waste. This study aimed to develop a hydrometallurgical process for recovering nickel from the spent steam reforming catalyst containing Ni, Mg, and Al. Our results indicated that nickel (Ni) was selectively recovered over magnesium (Mg) and aluminum (Al) through two consecutive steps: leaching with hydrochloric acid (HCl) and precipitating with dimethylglyoxime (DMG). The optimum conditions for the leaching were 3.0&#xa0;M HCl, 5.0&#xa0;g/l pulp density, 80&#xa0;°C, and 3.0&#xa0;h, and the leaching rate of metals was ~ 100% Ni, ~ 60.0% for each Mg and Al. More than 99.0% Ni(II) in the leachate containing Mg(II) and Al(III) was selectively precipitated to Ni(DMG)<sub>2</sub> with 99.9% purity under the best conditions to be 1:2 of Ni(II)/DMG molar ratio, pH 4 at 30&#xa0;°C for 30&#xa0;min. As a result, a simple and cost-effective hydrometallurgical process for recovering nickel (Ni) from spent catalysts is proposed. With its advantages, this method can be applied to recover Ni(II) from various secondary sources.</p> Graphical Abstract <p></p>

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A Simple Process for Recovering High-purity Nickel(II) Compound from Spent Steam Reforming Catalyst by Acid Leaching and Selective Precipitation with Dimethylglyoxime

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Thanh Tuan Tran,
  • Ngoc Thanh Tran,
  • Ngoc Han Le,
  • Ngoc Thach Le,
  • Quoc Hung Bui,
  • Huynh Giao Dang,
  • Van Hong Thien Doan,
  • Man Seung Lee,
  • Viet Nhan Hoa Nguyen

摘要

Recovering a strategic metal like nickel from secondary resources has attracted much interest due to its growing demand, depleting high-grade ores, and increasing prices. Steam reforming catalysts based on nickel play vital roles in the production processes of gases. After certain operations, these catalysts become inactive and are disposed of as hazardous solid waste. This study aimed to develop a hydrometallurgical process for recovering nickel from the spent steam reforming catalyst containing Ni, Mg, and Al. Our results indicated that nickel (Ni) was selectively recovered over magnesium (Mg) and aluminum (Al) through two consecutive steps: leaching with hydrochloric acid (HCl) and precipitating with dimethylglyoxime (DMG). The optimum conditions for the leaching were 3.0 M HCl, 5.0 g/l pulp density, 80 °C, and 3.0 h, and the leaching rate of metals was ~ 100% Ni, ~ 60.0% for each Mg and Al. More than 99.0% Ni(II) in the leachate containing Mg(II) and Al(III) was selectively precipitated to Ni(DMG)2 with 99.9% purity under the best conditions to be 1:2 of Ni(II)/DMG molar ratio, pH 4 at 30 °C for 30 min. As a result, a simple and cost-effective hydrometallurgical process for recovering nickel (Ni) from spent catalysts is proposed. With its advantages, this method can be applied to recover Ni(II) from various secondary sources.

Graphical Abstract