Research on Precipitation Process and Dynamics Behaviors of Ammonium Polyvanadate
-
摘要: 研究了多钒酸铵沉钒最佳工艺条件。结果表明,多钒酸铵的最佳沉淀条件为:焙烧浸出钒液的钒浓度控制在32~40 g/L,沉淀剂加入系数为0.8~1.2,加酸前温度大于65℃,沉钒pH为1.7~2.1,93℃左右的沸腾温度条件下沉淀时间为52~60 min,在最佳铵盐沉钒条件下的沉钒率可超过99%。根据最优条件下的多钒酸铵沉淀工艺,研究了多钒酸铵的沉钒动力学行为,利用Avrami结晶动力学方程对沉钒过程进行描述,其表观活化能Ea=35.87 kJ/mol,指前因子A=5.42×1020 min-1。Abstract: The precipitation process of ammonium polyvanadate was studied in this paper.At the optimum conditions of 32～40 g/L for vanadium concentration in the solution by roasting-leaching process,0.8～1.2 of precipitant addition coefficient,above 65 ℃ of temperature before the acid addition,1.7～2.1 of precipitation pH and about 93 ℃ of boiling temperature for 52～60 min,a precipitation rate of vanadium over 99% can be achieved.Furthermore,the kinetics behaviors for precipitation of ammonium polyvanadate were investigated at the optimum conditions.The precipitation process of ammonium polyvanadate can be described by Avrami crystallization kinetics equation,with the apparent activation energy Ea=35.87 kJ/mol and the pre-exponential factor A=5.42×1020 min-1,respectively.
-
点击查看大图
计量
- 文章访问数: 47
- HTML全文浏览量: 15
- PDF下载量: 3
- 被引次数: 0
下载:
