摘要:
针对现有钒提取技术存在的焙烧过程能耗高,回收率低的问题,提出采用钛白废酸无焙烧加压浸出钒渣提钒的新技术,对该技术中浸出液中钒铁萃取分离过程进行研究,结果表明:在pH=-0.86的条件下,萃取剂N235体积分数25%,有机相与水相体积比(VO/VA)=5:1,萃取震荡时间为10 min,添加氯化钠使氯离子浓度达到140 g/L的条件下,单级铁萃取率为34.15%,钒萃取率低于2%,铁钒分离系数达42.54,可实现高铁浸出液中铁钒有效分离。
Abstract:
In view of the high energy consumption in the process of roasting and low recovery rate of vanadium for the current vanadium extraction technologies,a new non-roasting process of pressure leaching of vanadium slag with waste acid from titanium dioxide production was put forward,and the extraction separation process of vanadium and iron in the leaching solution was investigated.The results show that the single-stage extraction rate of iron can reach 34.15% and the extraction rate of vanadium is less than 2% with up to 42.54 of separation coefficient for iron to vanadium,at pH=-0.86,25% of volume fraction for extraction agent N235,5:1 of volume ratio for organic to aqueous phase(VO/VA),10 min of shaking time and 140 g/L of Cl- concentration by adding NaCl.The process can realize an effective separation of iron from the high iron-containing vanadium leaching solution.
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