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实验研究了采用钾系与钠系亚熔盐反应介质提取含钒钢渣中钒的工艺与机理.结果表明,亚熔盐体系对含钒钢渣的提钒机理是通过分解硅酸二钙、硅酸三钙、铁酸钙等钒的固溶相,使钒以可溶性钒酸盐形式溶出,钢渣中高CaO对钒溶出的负面影响可通过调整浸出液中氢氧化钠(钾)浓度避免.与传统工艺相比,亚熔盐体系反应温度由850℃降至220~240℃,反应时间由4~6 h降至1~2 h,在显著降低能耗、提高效率的同时,钒的一次转化率钠系可达85%,钾系可达97%;且在钾系亚熔盐氧化性气氛中实现钒、铬共提,基本实现了含钒钢渣中钒的高效清洁提取.
The process and mechanism of vanadium extraction from vanadium-bearing steel slag by using potassium-based and sodium-based sub-molten salt reaction medium were studied experimentally.The results show that the vanadium extraction mechanism of vanadium-bearing steel slag by sub-molten salt system is through the decomposition of dicalcium silicate, Tricalcium, calcium ferrite and other vanadium solid solution phase, the vanadium dissolved in the form of soluble vanadate, slag the high CaO vanadium dissolution of the negative impact can be adjusted by leaching solution of sodium hydroxide (potassium) concentration to avoid with the traditional process phase The reaction temperature decreased from 850 ℃ to 220 ~ 240 ℃, and the reaction time decreased from 4 ~ 6 h to 1 ~ 2 h. In addition to significantly reducing energy consumption and increasing efficiency, the primary conversion rate of vanadium Up to 85%, potassium up to 97%; and in the potassium sub-molten salt oxidation atmosphere to achieve vanadium, chromium co-mentioning, the basic vanadium vanadium slag containing vanadium efficient clean extraction.