Kinetics analysis of decomposition of vanadium slag by KOH sub-molten salt method  

KOH亚熔盐法分解钒渣的动力学分析(英文)

作　　者：刘挥彬[1,2,3] 杜浩[1] 王大卫[4] 王少娜[1] 郑诗礼[1] 张懿[1] 

机构地区：[1]中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室,北京100190 [2]中国科学院大学,北京100049 [3]中国恩菲工程技术有限公司,北京100038 [4]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第5期1489-1500,共12页中国有色金属学报（英文版）

基　　金：Project(2013CB632605)supported by the National Basic Research Development Program of China;Projects(51274178,51274179)supported by the National Natural Science Foundation of China

摘　　要：A novel process was developed for the decomposition of vanadium slag using KOH sub-molten salt under ambient pressure, and the effects of reaction temperature, alkali-to-ore mass ratios, particle size, and stirring speed on vanadium and chromium extraction were studied. The results suggest that the reaction temperature and KOH-to-ore mass ratio are more influential factors for the extraction of vanadium and chromium. Under the optimal reaction conditions （temperature 180 °C, initial KOH-to-ore mass ratio 4：1, stirring speed 700 r/min, gas flow 1 L/min, and reaction time 300 min）, vanadium and chromium extraction rates can reach up to 95% and 90%, respectively. Kinetics analysis results show that the decomposing process of vanadium slag in KOH sub-molten salt can be well interpreted by the shrinking core model under internal diffusion control. The apparent activation energies for vanadium and chromium are 40.54 and 50.27 kJ/mol, respectively.开发了一种常压下用KOH亚熔盐介质氧化分解钒渣的新工艺,并考察了反应温度、碱矿质量比、粒度、搅拌速率等工艺参数对钒铬浸出的影响。结果表明,反应温度、碱矿比是最重要的影响因素;在反应温度180°C、碱矿质量比4:1、搅拌速率700r/min、通氧气流量1L/min的条件下,反应进行300min后钒、铬的浸出率分别达到了95%和90%。动力学分析表明,钒渣在KOH亚熔盐介质中的氧化分解遵循缩核模型,并受内扩散控制。钒铬尖晶石分解反应的表观活化能分别为40.54和50.27kJ/mol。

关 键 词：vanadium slag SPINEL sub-molten salt method kinetics analysis DECOMPOSITION activation energy 

分 类 号：TF841.3[冶金工程—有色金属冶金]