高钙高磷钒渣提钒工艺研究进展

为了给解决高钙高磷钒渣难利用问题提供参考,在归纳目前已提出的钠化焙烧—水浸提钒、钙化焙烧—酸浸提钒、钙化焙烧—碳酸钠浸出提钒、含钒溶液溶剂萃取提钒、含钒溶液离子交换提钒等主要的钒渣提钒工艺基础上,着重介绍了其中的钠化焙烧—水浸提钒工艺、钙化焙烧—酸浸提钒工艺、钙化焙烧—碳酸钠浸出提钒工艺以及新提出的钙化焙烧—碳酸铵浸出提钒工艺和钙化焙烧—草酸盐浸出提钒工艺在处理高钙高磷钒渣方面的研究进展,最后针对这些工艺尚存在的缺陷,指出寻找钙化焙烧除磷添加剂、减少碳酸铵浸出时的浸出剂用量、简化草酸盐浸出时的浸出剂种类等应该是高钙高磷钒渣提钒工艺今后的研究方向。

Progress in Vanadium Extraction from High Calcium and High Phosphorus Vanadium Slag

In order to provide a reference for overcoming the difficulty in utilization of high calcium and high phosphorus vanadium slag, the main vanadium extraction processes from slag are summarized such as sodium roasting-vanadium extraction by water leaching, calcified roasting -vanadium extraction by acid leaching, calcified roasting-vanadium extraction by sodium carbonate leaching, vanadium extraction by solvent, and vanadium extraction by ion exchange.Based on these processes, such processes as sodium roasting-vanadium extraction by water leaching, calcified roasting-vanadium extraction by acid leaching, calcified roasting-vanadium extraction by sodium carbonate leaching are focused on, and advances in some new processes in treating high calcium and high phosphorus vanadium slag are emphasized, including calcified roasting-vanadium extraction by ammonium carbonate leaching, calcified roasting-vanadium extraction by oxalate leaching.In view of the defects in these processes, it is clear that fining additives for phosphorus removal in calcified roasting, declining the dosage of leaching agent in ammonium carbonate leaching and simplifying the leaching agent types in oxalate leaching should be the research direction for vanadium extraction from high calcium and high phosphorus vanadium slag.