Recovering valuable metals from spent hydrodesulfurization catalyst via blank roasting and alkaline leaching.
Recovering valuable metals from spent hydrodesulfurization catalyst via blank roasting and alkaline leaching.
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DOI：
10.1016/j.jhazmat.2021.125849
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发表时间：
2021-04
影响因子：
13.6
通讯作者：
Jianzhang Wang;Shaona Wang;A. Olayiwola;Na Yang;Biao Liu;J. Weigand;Marco Wenzel;H. Du
中科院分区：
文献类型：
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作者：
Jianzhang Wang;Shaona Wang;A. Olayiwola;Na Yang;Biao Liu;J. Weigand;Marco Wenzel;H. Du
加氢脱硫（HDS）废催化剂含有大量的钒（V）、钼（Mo）、铝（Al）、镍（Ni）等金属和污染物，是一种危险废物，不仅会破坏生态系统，而且会造成资源浪费。本文提出了一种以空白焙烧-碱浸为特征的加氢脱硫废催化剂回收工艺。在焙烧过程中，低价化合物转化为高价氧化物，可以用NaOH溶液浸出。然后，使浸出液结晶以分离金属。结果表明，在650 °C焙烧条件下，钒、钼和铝的浸出率分别为97%、96%和88%;在1000 °C焙烧条件下，钒和钼的选择性浸出率分别为91%和96%，而铝的浸出率可忽略不计。NiO不溶于强碱，残留在残渣中。该工艺的优点是，首先，可以通过控制焙烧条件来操纵V、Mo和Al的浸出，从而提供灵活的工艺设计。二是浸出液可充分循环利用。最终实现了温和的浸出条件和钒、钼、铝的清洁分离，为同行研究提供了基础信息，以促进他们未来研究开发更高效、更清洁的技术。
Spent hydrodesulfurization (HDS) catalysts, containing considerable amount of pollutants and metals including vanadium (V), molybdenum (Mo), aluminum (Al), and nickel (Ni), are considered as hazardous wastes which will result in not only ecosystem damage but also squandering resource. Herein, a process featuring blank roasting-alkaline leaching is proposed to recover spent HDS catalyst. During roasting, low-valence compounds convert to high-valence oxides which can be leached out by NaOH solution. Afterwards, leaching solution is subjected to crystallization to separate metals. The results show that for samples roasted at 650 °C, 97% V, 96% Mo, and 88% Al are leached out at optimal condition; for samples roasted at 1000 °C, selective leaching of 91% V and 96% Mo respectively, are realized, with negligible Al being dissolved. NiO is insoluble in strong alkali leaving in residue. The advantages of this process are that first, the leaching of V, Mo, and Al can be manipulated by controlling roasting conditions, providing flexible process design. Second, leaching solution can be fully recycled. Finally, mild leaching condition and clean separation of V, Mo, and Al is achieved, proving fundamental information for peer researches to facilitate their future research on the development of more efficient and cleaner technologies.