多钒酸铵返溶的动力学研究  

Study on Kinetics of Ammonium Polyvanadate Re-dissolution

作　　者：尹丹凤[1] 孙朝晖[1] 景涵[1] 杜光超[1] 陈海军[1] 

机构地区：[1]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花617000

出　　处：《钢铁钒钛》2015年第6期13-17,共5页Iron Steel Vanadium Titanium

基　　金：国家重点基础研究发展计划“973”项目(2012CB724202)

摘　　要：多钒酸铵返溶是工业上生产高纯五氧化二钒的重要步骤。采用p H标定法测量多钒酸铵的返溶率,在氢氧化钠浓度为0.5 mol/L,液固比为20∶1的现行生产工艺条件下对多钒酸铵返溶的动力学进行了研究。结果表明:多钒酸铵的返溶率随温度和搅拌速度的增大而增大;多钒酸铵返溶的动力学模型为液膜非稳态扩散模型,受液膜非稳态扩散控制,表观活化能为6.15 k J/mol;适当增大搅拌速度、升高返溶温度都能提高多钒酸铵返溶的扩散速率。Ammonium polyvanadate re-dissolution is an important process for industrial production of high purity vanadium pentoxide. The pH calibration method was employed to measure the re-dissolution rate of ammonium polyvanadate. The re-dissolution kinetics of ammonium polyvanadate was studied under produc- tion process conditions of NaOH concentration 0.5 mol/L and liquid-solid ratio 20 ： 1. According to the ki- netics experiments and calculations, the re-dissolution rate of ammonium polyvanadate was found to in- crease with increasing temperature and agitation speed. The kinetic model for re-dissolution of ammonium polyvanadate is unsteady-state diffusion of liquid film, with unsteady-state diffusion of liquid film as the control step and 6.15 kJ/mol of the calculated activation energy. Proper increase in agitation speed and re- dissolution temperature can enhance the diffusion rate for re-dissolution of ammonium Dolyvanadate.

关 键 词：多钒酸铵 返溶 动力学 活化能 

分 类 号：TQ135.11[化学工程—无机化工]