(東北大學(xué) 冶金學(xué)院，沈陽 110819)
摘 要: 釩是重要的戰(zhàn)略資源，目前主要是從釩鈦磁鐵礦經(jīng)“高爐冶煉-轉(zhuǎn)爐吹釩”工藝所得釩渣中采用濕法冶金提取，其中萃取方法應(yīng)用最多。本文研究以N-辛基吡啶類離子液體為萃取劑，正戊醇為稀釋劑，采用溶劑萃取法考察萃取分離V(Ⅴ)的影響因素，包括溫度、時(shí)間以及溶液pH并對其萃取機(jī)理進(jìn)行研究。結(jié)果表明：在[OPy]Cl和[OPy][BF4]萃取V(Ⅴ)最適宜的條件下，即萃取時(shí)間分別為60 s和40 s、pH=2.957~8.029、溫度為25 ℃時(shí)，兩者的V(Ⅴ)萃取率分別達(dá)到95.42%和93.52%；結(jié)合離子選擇性電極法、斜率法、紫外-可見光譜分析、紅外光譜分析等方法研究并確定了N-辛基吡啶類離子液體萃取V(Ⅴ)的機(jī)理為陰離子交換。
關(guān)鍵字: 釩渣水浸液；N-辛基吡啶類離子液體；萃取機(jī)理
（School of Metallurgy, Northeastern University, Shenyang 110819, China）
Abstract:Vanadium is a vitally important strategic resource. At present, the main method to recover vanadium from vanadium slag which obtains from “blast furnace smelting-converter blowing vanadium” process of vanadium-titanium magnetite is hydrometallurgical technology, and the most applied method is solvent extraction. The study was designed to extract V(Ⅴ) from vanadium slag leaching solution by solvent extraction using N-Octylpyridine ionic liquids as extractant and 1-pentanol as diluent. Different parameters affecting the extraction process such as extraction temperature, equilibrium time and extraction pH were investigated. The extraction mechanism was also studied. The results show that under the optimal conditions of pH 2.957-8.029 and 25 ℃, the maxmium extraction rate reaches 95.42% with [OPy]Cl after 60 s and 93.52% with [OPy][BF4] after 40 s, respectively. Furthermore, based on the methods of ion selective electrode, slope analysis, ultraviolet-visible spectrum and infrared spectrum analysis, the mechanism of extraction is determined as anion exchange.
Key words: vanadium slag leaching solution; N-Octylpyridine ionic liquids; extraction mechanism
