贵金属脱氰过程的搅拌釜流场数值模拟  

A numerical simulation of flow field in stirring tank during the process of decyanation for precious metal

作　　者：刘庭耀[1] 章鹏程[1] 李剑锋[1] 袁玮[1] 韩丽辉[2] 刘青[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《材料与冶金学报》2015年第1期29-35,共7页Journal of Materials and Metallurgy

基　　金：国家高技术研究发展计划(863计划)(2013AA065703)

摘　　要：为提高搅拌釜在处理贵金属废水过程中的生产效率,本文通过数值模拟来研究反应釜内的流场情况.利用实验数据和模拟结果对比,论证模拟结果的可靠性;通过模拟来研究搅拌桨的转速、挡板、湍动能对搅拌釜内流场的影响,并提出相应的改进意见.研究表明,虽然加快搅拌釜的转速在一定程度上能改善流场流动环境,但仍有＂死区＂的存在,采用多桨可以弥补单纯提高桨速方法的不足.添加挡板不仅能在相同的转速下有效扩大高速流动区域,而且对自由液面的波动可以起到良好的稳定作用.研究还表明,在距桨叶片大约1~2mm处是整个流场湍动能最大的区域,脱氰药剂在此投入可以提高其在釜内的扩散速率.A numerical simulation of flow field in the stirring tank was conducted in order to improve the efficiency of the tank for disposal of the wastewater from precious metal melting. Reliability of the simulation was demonstrated through comparison of experimental data with simulation results. Effects of paddle speed,baffle and turbulence energy on flow field in the tank were studied through the simulation. Some suggestions were proposed. The results showed that there still a＂dead region＂exists although increasing the stirring speed can improve situation of the flow field to some extent. Multi- paddle can overcome the shortage of a single paddle. Baffle can not only expand the high speed region at the same speed,but also can obviously stabilize the fluctuation of the free liquid surface. It was found that there is a special zone 1 ~ 2 mm away from the paddle,where the turbulence energy has a maximum value. If the decyanation reagent is put there,diffusion rate of the reagent will increase greatly.

关 键 词：搅拌釜 数值模拟 多参考系 脱氰 

分 类 号：TF351[冶金工程—冶金机械及自动化]