摘要
对钒渣空白焙烧-碱浸提钒,研究了钒渣中钒的转化和溶出规律.结果表明,焙烧过程中渣中钒铁尖晶石FeV_2O_4中的钒逐步氧化成VO_2和V_2O_5,并优先与Ca,Mn和Mg等形成钒酸盐;浸出分为低温浸出和高温浸出,低于180℃只能浸出钒酸盐和钒氧化物,高于180℃可浸出固溶在硅酸钙中的钒,钒浸出率达97.63%.
The conversion and dissolution mechanism of vanadium in the process of blank roasting and alkali leaching were studied. The results showed that vanadium in spinel（FeV_2O_4） was gradually oxidized into VO_2 and V_2O_5, and then formed vanadate by combining with Ca/Mn/Mg. Leaching process ccan be divided into low temperature leaching（T180 ℃） and high temperature leaching. Low temperature leaching only extracted vanadate and vanadium oxide, while high temperature leaching（T≥180 ℃） extracted the vanadium in the form of solid solution in calcium silicate. Vanadium leaching rate in blank roasting and alkali leaching process reached 97.63%, while the rate of traditional process was only 80%. The application of blank roasting and alkali leaching process could realize the high efficiency and clean extraction of vanadium from vanadium-bearing slag.
出处
《过程工程学报》
CAS
CSCD
北大核心
2016年第3期445-451,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:51404227
51274179)
国家重点基础研究发展规划(973)基金资助项目(编号:2013CB632605)
关键词
钒渣
空白焙烧
碱浸
钒铁尖晶石
机理
vanadium slag
blank roasting
alkali leaching
spinels
mechanism
