摘要
相比传统的钒渣钠化焙烧—水浸提钒工艺,钙化焙烧—酸浸提钒更符合现代化生产的环保需求.本研究以西昌钒渣为原料,进行了钒渣钙化焙烧—酸浸提钒工艺研究,通过热重-差热分析(TG-DSC)以及钒浸出实验,系统研究了单一和混合焙烧添加剂对焙烧过程的影响,探究了配钙比、焙烧时间和焙烧温度对钒渣中主要物相演变规律及钒提取行为的影响.综合实验结果和生产成本来看,单一CaCO3作为钙化焙烧添加剂效果较好.以配钙比(n(CaO)/n(V2O5))为2加入CaCO3、焙烧时间为2h、焙烧温度为850℃时钒浸出率达到84.35%.在钙化焙烧过程中,尖晶石相和橄榄石相发生分解,低价铁被氧化成Fe2O3,钒由低价氧化到高价并生成钒酸钙.
Comparing with sodium roasting-water leaching technic,calcification roasting-acid leaching technic is more accord with modern production requirements.This paper focused on calcification roasting-acid leaching technic by using vanadium slag in Xichang.The behavior of single and compound roasting additives in calcification roasting process were discussed through analyzing TG-DSC and carrying out the experiments of vanadium leaching.And the influences of the ratio of CaO and V 2O 5,roasting temperature and roasting time on evolution of main phase and vanadium extracting were studied.Taken the experiment results and cost together,CaCO 3 was considered as the optimal calcium additive.When CaCO 3 was added to vanadium slag,the ratio of CaO and V 2O 5 was 2,the roasting time was 2 h,the roasting temperature was 850℃,the vanadium leaching rate reached 84.35%.Spinel and olivine were decomposed in the process of calcification roasting.Low valence iron was oxidized to Fe 2O 3,and vanadium was oxidized from low valence to high valence and then turned to calcium vanadate.
作者
余唐霞
曹婧
温婧
孙红艳
姜涛
Yu Tangxia;Cao Jing;Wen Jing;Sun Hongyan;Jiang Tao(School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《材料与冶金学报》
CAS
北大核心
2020年第3期176-184,共9页
Journal of Materials and Metallurgy
基金
国家自然科学基金(51574082)
中央高校基本科研业务费(N150202001)
钒钛资源综合利用国家重点实验室开放课题.
关键词
钒渣
焙烧添加剂
钙化焙烧
vanadium slag
roasting additives
calcification roasting
