钒铬渣氧化钙化焙烧-酸浸提钒实验研究  

Experimental Study on Vanadium Extraction by Oxidation Calcification Roasting and Acid Leaching of Vanadium-Chromium Slag

作　　者：吴恩辉 侯静 李军 

机构地区：[1]攀枝花学院攀西科技创新中心,四川攀枝花617000

出　　处：《稀有金属与硬质合金》2017年第6期8-13,共6页Rare Metals and Cemented Carbides

基　　金：攀枝花市科技计划项目(2013CY-G-31)

摘　　要：通过计算钒铬渣氧化钙化焙烧的反应Gibbs自由能,对其过程进行理论分析,结果表明,钒铬渣氧化钙化焙烧过程生成钒酸钙要比生成铬酸钙在热力学上更有优势,可以控制一定的工艺条件,使钒铬渣中V先提取出来,达到V与Cr分离的目的。通过对钒铬渣氧化钙化焙烧-酸浸工艺的正交实验研究,探讨钙化时间、氧化时间、钙比和焙烧温度对V、Cr转浸率的影响;结果表明,影响V转浸率的因素按主次排序依次是:钙比>焙烧温度>钙化时间>氧化时间。进一步采用单因素实验研究了钙比和焙烧温度对V、Cr转浸率的影响;结果表明,适宜的优先提钒工艺参数为:焙烧温度1 000℃,钙比1.2,氧化时间2h,钙化时间2h,在此条件下V转浸率可达85.76%,Cr转浸率为14.61%。The oxidation calcification roasting process of vanadium-chromium slag was theoretically analyzed based on the calculation of reaction Gibbs free energy.The results show that the formation of calcium vanadate has more thermodynamic advantages than the formation of calcium chromate during oxidation calcification roasting of vanadium-chromium slag.Vanadium can be preferentially extracted to achieve separation of V and Cr by controlling certain process conditions.Based on orthogonal experimental study of oxidation calcification roasting and acid leaching of vanadium-chromium slag,the effects were discussed of calcification time,oxidation time,calcium ratio and calcination temperature on the leaching rate of V and Cr.The results show that the influence factors of vanadium leaching rate have the following primary and secondary order：calcium ratio〉roasting temperature〉calcification time〉oxidation time.The effects of calcium ratio and roasting temperature on the leaching rate of V and Cr were investigated further by single factor experiments.The results show that the optimal leaching conditions for preferentially extracting vanadium are as follows：roasting temperature of 1 000℃,calcium ratio of 1.2,oxidation time of 2 hand calcification time of2 h.Under the optimal conditions,the leaching rates of vanadium and chromium are 85.76% and 14.61%,respectively.

关 键 词：钒铬渣 氧化焙烧 钙化焙烧 酸浸 V CR 分离 

分 类 号：TF841.3[冶金工程—有色金属冶金]