Spent hydrogenation catalysts are strategic resources due to the high contents of Ni, Mo, and V. These metals were reduced and enriched as NiMoV alloy through pyrometallurgical smelting. However, it is a technical bottleneck for the separation of Ni, Mo and V from the polymetallic alloy. Hence, this paper proposed the atmospheric oxidation leaching of NiMoV alloy and separation of Ni, Mo and V through solvent extraction. The mixed solution of HCl and HNO was employed as the leaching reagent for the dissolution of the alloy. The leaching efficiencies of Ni, Mo and V were all exceed 99.5% under the optimal conditions: c(HCl) of 3.0 mol/L, c(HNO) of 2.5 mol/L, S/L of 1:10 (g/mL), temperature of 95 °C for 3.0 h. N235 was used as the extractant for the synergistic extraction of V and Mo, while TBP and sulfonated kerosene was used as modifier and diluent. The extraction efficiencies of V and Mo were 99.2% and 99.9% under three-stage extraction of the following conditions: pH of 1.2, c(N235) of 25 vol%, and O/A of 1:1. It was found that only 0.01% Ni and 9.7% Fe entered the organic phase and can be removed by washing, which showed excellent selectivity for V and Mo. Then, based on the principle of ion exchange, HSO and NH·HO were used to selectively strip V and Mo. Finally, VO, MoO and Ni(OH) were obtained after precipitation and calcination.

中文翻译：

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废加氢催化剂富集 NiMoV 合金的氧化浸出及溶剂萃取 Mo 和 V

废加氢催化剂中Ni、Mo、V含量较高，是战略资源。这些金属通过火法冶炼被还原富集为NiMoV合金。然而，从多金属合金中分离Ni、Mo、V却是一个技术瓶颈。因此，本文提出对NiMoV合金进行常压氧化浸出，并通过溶剂萃取分离Ni、Mo、V。采用HCl和HNO的混合溶液作为浸出剂溶解合金。在c(HCl)为3.0 mol/L、c(HNO)为2.5 mol/L、S/L为1:10 (g/mL)的最佳条件下，Ni、Mo、V的浸出率均超过99.5%。 ），温度95℃3.0小时。以N235为萃取剂，协同萃取V和Mo，以TBP和磺化煤油为改性剂和稀释剂。在pH为1.2、c(N235)为25vol%、O/A为1:1的三级萃取条件下，V和Mo的萃取效率分别为99.2%和99.9%。结果发现，只有0.01%的Ni和9.7%的Fe进入有机相，可以通过洗涤去除，对V和Mo表现出优异的选择性。然后，基于离子交换原理，采用HSO和NH·H2O对选择性脱除V和Mo，经过沉淀和煅烧最终得到VO、MoO和Ni(OH)。