湿法提钒浸出段搅拌反应器结构的优化

清洁提钒工艺中,熟料的湿法浸出是重要的操作单元.浸出搅拌反应器的合理设计与优化,可缩短浸矿时间以及提高浸矿效率.本文通过改变搅拌桨桨叶间的层间距、搅拌桨的安装层数以及安装导流筒等方法,对攀钢集团公司的浸出搅拌反应器进行优化和改进;并结合计算流体动力学(CFD)Fluent商业软件,分别模拟了原浸出搅拌反应器和改进后浸出搅拌反应器的宏观流场结构.结果表明:在层间距C₂为1100mm的原双层搅拌桨浸出搅拌反应器内,流体轴向速度较小,“死区”现象较严重;与原反应器相比,调整双层搅拌桨桨叶之间的层间距C₂为1800mm以及安装3层搅拌桨或导流筒,都可加强反应器内流体的轴向流动,减小“死区”范围,进而改善流场结构的均匀分布,有助于强化流体混合.

Optimization of stirred reactor in leaching process for extractive hydrometallurgy of vanadium

Leaching stirred reactor is one of the important unit in leaching process. Reactor with reasonable optimization design contributes to leaching time reduction and leaching efficiency improvement. The leaching stirred reactor of Pangang Group Company was optimized by adjusting blade layer spacing,changing impeller installation layers or installing draft tube. The macroscopic flow structure was simulated for original and improved leaching stirred reactor with computational fluid dynamics(CFD) software Fluent. Results showed that the original double-impeller reactor with layer spacing C₂ at 1100mm contributed to small fluid axial velocity and serious “dead zone” phenomenon. The spacing C₂ in the double-impeller layer was adjusted to 1800mm and a three-impeller or draft tube was installed. Compared with the original reactor,the above improvement could contribute to fluid axial flow strengthening,“dead zone” areas reduction,flow structure variation improvement and fluid mixing efficiency enhancement.