钒渣钙化焙烧熟料酸浸过程钒溶解规律研究

Research on Dissolution of Vanadium in Acid Leaching Process of Calcified Roasting Clinker of Vanadium Slag

以某公司钒渣钙化焙烧熟料为原料,开展硫酸酸浸试验,研究了浸出p H值、温度、时间、液固比及搅拌速度对钒浸出率的影响规律。采用SEM、XRD等分析方法,进一步研究了熟料中钒的赋存状态和酸浸过程的溶解规律。结果显示,熟料中钒以钒酸盐的形式存在,主要分布在钒酸钙、氧化铁固溶体、铁板钛矿等物相中。熟料在酸浸过程中含钒物相的溶解顺序为:钒酸钙>氧化铁固溶体>>铁板钛矿。最佳酸浸参数为浸出p H值0.75,温度50℃,时间10 min,液固比10∶1,搅拌速度500 r/min,钒浸出率可达90.21%。

Using the calcified roasting clinker of vanadium slag from a certain company as raw materials, sulfuric acid leaching experiments were carried out to investigate the influences of pH, temperature and time, liquid-solid ratio and stirring rate of leaching process on extraction rate of vanadium. The occurrence state of vanadium in the clinker and its dissolution during leaching process were further studied by SEM and XRD. The results show that vanadium in clinker exists as vanadates, mainly distributing in calcium vanadate, iron oxides solid solution, pseudobrookite phases etc. In the process of acid leaching, the dissolution sequence of vanadium-containing phases is as follows： calcium vanadate 〉 solid solution of iron oxides 〉〉 pseudobrookite. The optimum leaching parameters are pH--0.75, 50 ℃ for 10 rain with 10 ： 1 of liquid-solid ratio and 500 r/rain of stirring rate, where up to 90.21% of vanadium leaching rate can be achieved.