Abstract Leach solutions of vanadium (V) slag was generated from (NH4)2SO4 (AS) roasting and water leaching process. After separating titanium (Ti) from the solutions, the remaining liquor contains a large amount of V and iron (Fe). In this study, a system composed of trioctyl tertiary amine (N235) and sulfonated kerosene was used to separate V; moreover, the feasibility, mechanism, and energy evaluation of this system were also investigated. The results indicated that the single-stage V extraction rate was 86.35% using 40% N235 (v/v) and 60% sulfonated kerosene, an initial pH of 1.23, an organic/aqueous phase ratio (O/A) of 1.5:1, a temperature of 298.15 K, and an extraction time of 1 min. Based on McCabe-Thiele analysis, over 99% of the V was extracted by three-stage countercurrent extraction. Using the slope method and Fourier transform infrared (FT-IR) spectroscopy, the V extracted by N235 was proposed to exist as [(R3NH)4·H2V10O28]. Using 1.4 mol/L ammonia water, over 90% of the V could be stripped. The effects of the impurities Si, Ca, Al, Mg, and Mn on V recovery were negligible. A preliminary material and energy calculation (MEC) indicated that 113.64 kg V2O5 could be recovered from 1000 kg raw V slag using 5.57 × 106 kJ of heat and 974.45 kWh of electricity.

中文翻译：

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使用 N235 溶剂萃取从钒渣浸出液中回收钒

摘要 钒(V)渣浸出液是由(NH4)2SO4(AS)焙烧和水浸过程产生的。从溶液中分离出钛 (Ti) 后，剩余的液体含有大量的 V 和铁 (Fe)。在本研究中，使用由三辛基叔胺 (N235) 和磺化煤油组成的系统来分离 V；此外，还研究了该系统的可行性、机理和能量评估。结果表明，使用40% N235 (v/v)和60%磺化煤油，初始pH为1.23，有机/水相比(O/A)为1.5:1，单级V提取率为86.35% ，温度为 298.15 K，提取时间为 1 分钟。根据 McCabe-Thiele 分析，超过 99% 的 V 是通过三级逆流萃取萃取的。使用斜率法和傅里叶变换红外（FT-IR）光谱，推测 N235 提取的 V 以 [(R3NH)4·H2V10O28] 的形式存在。使用 1.4 mol/L 氨水，可以去除 90% 以上的 V。杂质 Si、Ca、Al、Mg 和 Mn 对 V 回收率的影响可以忽略不计。初步材料和能量计算 (MEC) 表明，使用 5.57 × 106 kJ 的热量和 974.45 kWh 的电力，可以从 1000 kg 原料 V 渣中回收 113.64 kg V​​2O5。