Metal Extraction and Forming Division, National Metallurgical Laboratory (Council of Scientific and Industrial Research), Jamshedpur - 831 007, India.
J Environ Manage. 2013 Aug 15;125:68-73. doi: 10.1016/j.jenvman.2013.03.032. Epub 2013 May 3.
Recovery of valuable materials/metals from waste goes hand in hand with environmental protection. This paper deals with the development of a process for the recovery of metals such as Mo, V, Ni, Al from spent hydroprocessing catalyst which may otherwise cause a nuisance if dumped untreated. A detailed study on the separation of molybdenum and vanadium from the leach solution of spent hydroprocessing catalyst of composition: 27.15% MoO₃, 1.7% V₂O₅, 3.75% NiO, 54.3% Al₂O₃, 2.3% SiO₂ and 10.4% LOI is reported in this paper. The catalyst was subjected to roasting under oxidizing atmosphere at a temperature of about 550 °C and leaching in dilute sulphuric acid to dissolve molybdenum, vanadium, nickel and part of aluminium. Metals from the leach solution were separated by solvent extraction. Both molybdenum and vanadium were selectively extracted with a suitable organic solvent leaving nickel and dissolved aluminium in the raffinate. Various parameters such as initial pH of the aqueous feed, organic to aqueous ratio (O:A), solvent concentration etc. were optimized for the complete extraction and recovery of Mo and V. Molybdenum and vanadium from the loaded organic were stripped by ammonia solution. They were recovered as their corresponding ammonium salt by selective precipitation, and were further calcined to get the corresponding oxides in pure form.
从废物中回收有价值的材料/金属与环境保护息息相关。本文介绍了一种从废加氢处理催化剂中回收钼、钒、镍、铝等金属的方法，否则这些金属未经处理丢弃会造成环境危害。本文详细研究了从组成成分为 27.15% MoO₃、1.7% V₂O₅、3.75% NiO、54.3% Al₂O₃、2.3% SiO₂和 10.4% LOI 的废加氢处理催化剂的浸出液中分离钼和钒的方法。催化剂在氧化气氛中于约 550°C 下进行焙烧，然后用稀硫酸浸出以溶解钼、钒、镍和部分铝。从浸出液中分离金属采用溶剂萃取法。采用合适的有机溶剂可选择性地萃取钼和钒，使镍和溶解的铝留在萃余液中。优化了初始水相 pH 值、有机相与水相的比例 (O:A)、溶剂浓度等各种参数，以实现钼和钒的完全萃取和回收。负载有机相中钼和钒用氨溶液反萃。通过选择性沉淀将其回收为相应的铵盐，并进一步煅烧以获得纯形式的相应氧化物。
