摘要
以湖北通山云母型含钒页岩为研究对象,采用NaOH碱熔焙烧—水浸工艺,考察了碱矿质量比、焙烧温度和时间、浸出温度和时间、液固比对钒浸出率的影响。结果表明,在碱矿质量比1∶1(g/g)、500℃焙烧60min、然后按液固比4.0(mL/g)在60℃浸出60min的条件下,钒浸出率可达84.63%。焙烧过程中,氢氧化钠参与含钒云母的分解反应,降低了云母分解反应的吉布斯自由能,云母结构的破坏程度加剧,强化了钒从云母晶格的释放;同时氢氧化钠参与化学反应,促进钒的溶出。
Effects of mass ratio of alkaline to ore, roasting temperature and time, leaching temperature and time, and L/S on vanadium leaching rate from black shale were investigated by NaOH molten roasting and water leaching. The results show that vanadium leaching rate is 84.63% under the optimum conditions including mass ratio of alkaline to ore of 1 ： 1 （g/g）, roasting at 500 ℃ for 60 rain, leaching temperature of 60 ℃, leaching time of 60 rain, and L/S of 4.0 （mL/g）. Participation of NaOH in decomposition of vanadium-bearing mica during roasting reduces Gibbs Free Energy of decomposition reaction of mica. As a result, damage of mica structure is intensified, and release of vanadium from mica lattice is strengthened. Meanwhile, participation of NaOH in chemical reaction promotes further dissolution of vanadium.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2018年第3期30-34,48,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(51604197
51404174)
关键词
含钒页岩
钒
氢氧化钠碱熔焙烧
水浸
black shale
vanadium
NaOH molten roasting
water leaching
