Wang Jianzhang, Wang Shaona, Olayiwola Afolabi, Yang Na, Liu Biao, Weigand Jan J, Wenzel Marco, Du Hao
School of Metallurgy, Northeastern University, Shenyang 110819, China; CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
J Hazard Mater. 2021 Aug 15;416:125849. doi: 10.1016/j.jhazmat.2021.125849. Epub 2021 Apr 15.
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.
废加氢脱硫（HDS）催化剂含有大量污染物和金属，包括钒（V）、钼（Mo）、铝（Al）和镍（Ni），被视为危险废物，不仅会导致生态系统破坏，还会造成资源浪费。在此，提出了一种空白焙烧-碱浸的工艺来回收废HDS催化剂。在焙烧过程中，低价化合物转化为高价氧化物，可被NaOH溶液浸出。之后，浸出液进行结晶以分离金属。结果表明，对于在650℃焙烧的样品，在最佳条件下97%的V、96%的Mo和88%的Al被浸出；对于在1000℃焙烧的样品，分别实现了91%的V和96%的Mo的选择性浸出，Al的溶解量可忽略不计。NiO不溶于强碱而留在残渣中。该工艺的优点在于，首先，可以通过控制焙烧条件来控制V、Mo和Al的浸出，提供灵活的工艺设计。其次，浸出液可以完全循环利用。最后，实现了温和的浸出条件以及V、Mo和Al的清洁分离，为同行研究提供了基础信息，以促进他们未来对更高效、更清洁技术开发的研究。
