Li Zhao, Chen Min, Zhang Qiwu, Liu Xinzhong, Saito Fumio
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.
Waste Manag. 2017 Feb;60:734-738. doi: 10.1016/j.wasman.2016.06.035. Epub 2016 Jul 12.
This work describes the mechanochemical transformations of molybdenum and vanadium sulfides into corresponding molybdate and vanadate, to serve as a new environment-friendly approach for processing hazardous spent hydrodesulphurization (HDS) catalysts solid waste to achieve an easy recovery of not only molybdenum and vanadium but also nickel and cobalt. Co-grinding the molybdenum and vanadium sulfides with oxidants and sodium carbonate stimulates solid-state reactions without any heating aid to form metal molybdates and vanadates. The reactions proceed with an increase in grinding time and were enhanced by using more sodium carbonate and stronger oxidant. The necessary conditions for the successful transformation can be explained on the basis of thermodynamic analyses, namely a negative change in Gibbs free energy.
这项工作描述了硫化钼和硫化钒向相应钼酸盐和钒酸盐的机械化学转化，作为一种新的环保方法来处理危险的废加氢脱硫（HDS）催化剂固体废物，不仅实现钼和钒的轻松回收，还能回收镍和钴。将硫化钼和硫化钒与氧化剂和碳酸钠共同研磨可激发固态反应，无需任何加热辅助即可形成金属钼酸盐和钒酸盐。反应随着研磨时间的增加而进行，使用更多的碳酸钠和更强的氧化剂可增强反应。成功转化的必要条件可基于热力学分析来解释，即吉布斯自由能的负变化。
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