摘要:
根据现有钒渣钠化提钒工艺的特点,巧妙规避钒、铬分离难题,提出了钒铬液离子交换法选择性提钒技术:选用阴离子树脂从高浓度含铬钒液中选择性吸附部分钒,交换余液返钠化提钒主流程继续生产氧化钒产品(冶金级)。分别研究了树脂型号、pH、反应时间与树脂吸附钒铬的关系,结果表明:将D201树脂用硫酸钠转型,在8.5
Abstract:
According to the characteristics of vanadium extraction from vanadium slag,selective extraction of vanadium from vanadium-chromium (V-Cr) containing solution by ion exchange was put forward to evade V-Cr separation problem. Partial vanadium was selectively adsorbed from high concentration of vanadium solution containing chromium by anion resin,and the raffinate was returned to produce vanadium oxide (metallurgical grade) by the main process of vanadium extraction. The effects of resin type,p H and reaction time on the adsorption of vanadium and chromium were studied. The results show that with D201 resin modified by sodium sulphate,vanadium can be selectively adsorbed under 8.5 < pH < 10 and 30~60 min of reaction time. Vanadium pentoxide with purity of 99.83% can be obtained through desorption of the vanadium-containing resin by sodium hydroxide solution,vanadium precipitation and calcination.