(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 針對現(xiàn)行石煤提釩萃取工藝及研究現(xiàn)狀，提出采用新型萃取劑HBL101從石煤高酸浸出料液中直接萃取釩的方案，考察料液的酸度、料液電位、萃取時(shí)間、相比以及溫度對萃取率的影響，繪制HBL1010萃取等溫曲線。結(jié)果表明：在料液酸度為1.458 mol/L，萃取溫度為35~45 ℃，萃取時(shí)間為10min，相比O/A=1/1(油相與水相體積比)的條件下，釩的單級萃取率達(dá)到95%以上。三級逆流萃取實(shí)驗(yàn)結(jié)果顯示，釩的萃取率達(dá)到99.7%以上。采用NaOH對負(fù)載有機(jī)相進(jìn)行反萃，反萃液經(jīng)調(diào)節(jié)pH后直接加入NH4Cl沉釩，得到的五氧化二釩純度達(dá)到98.68%以上。
關(guān)鍵字: 石煤；釩；萃取；HBL101
（School of metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:A new extractant HBL101 was used to directly extract vanadium from high acid leach solution of stone coal. The effects of acidity and potential of feed, time, phase ratio and temperature on the extraction of vanadium were investigated. The extraction distribution isotherms of vanadium were plotted. The extraction distribution isotherm was also obtained. The results show that the extraction of vanadium from the solution with 1.458 mol/L [H+] reaches 95% in single stage with A/O ratio of 1:1 (volume ratio of oil phase to aqueous phase) at 35-45 ℃ for 10 min. In three-stage counter current test, the extraction rate of vanadium is 99.7%. The loaded organic can be easily stripped using NaOH solution. After pH adjustment, the strip liquor is used to precipitate vanadium by adding NH4Cl. The final product of V2O5 with purity of 98.68% can be obtained.
Key words: stone coal; vanadium; extraction; HBL101
