(中南大学 冶金与环境学院，长沙 410083)
摘 要: 利用计算流体力学(CFD)技术，对在使用框式搅拌桨条件下磷硫混酸浸出白钨矿串联方型搅拌槽内的固体颗粒流动行为进行了三维数值模拟及分析，探究进口流速、溢流板高度、相邻溢流板间距对串联搅拌浸出槽的串联分区效果的影响规律。以5槽串联的浸出槽(单槽尺寸为200 mm×200 mm×310 mm)为例，进行了槽内流场特性模拟和实验验证。结果表明：利用溢流板串联过后的连续搅拌酸浸槽内会因为在相邻的溢流板之间得不到有效搅拌作用而发生堆积现象；随着溢流板高度的增高、溢流板间距的减小，白钨矿连续酸浸槽内串联效果逐渐变好。实验结果表明：当进口流量为400 mL/min、溢流板高度为190 mm、溢流板间距为6 mm时，计算得到的虚拟槽数N接近实际串联的槽数5，无因次化方差为0.2108，多槽联接的串联效果良好。本研究为硫磷混酸连续浸出白钨矿浸出槽的工业优化设计提供了理论基础和优化方向。
关键字: 浸出槽；流动行为；计算流体力学(CFD)；停留时间分布(RTD)；非理想流动模型
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The application of computational fluid dynamic technology (CFD) using three-dimensional numerical simulation method on the analysis of gypsum particle flow behavior in the tanks reactor for scheelite leaching was investigated. The influences of inlet flow rate, height and spacing of overflow plates on the partition effect of tanks reactor was studied. A set of five stirred tanks reactor(size of single tank: 200 mm×200 mm×310 mm) was used as an example to simulate the flow field characteristics in the vessel. The results show that the particles gradually accumulated in between adjacent overflow plates due to non-effective mixing. With inlet flow rate and the height of overflow plate increasing and overflow plate spacing decreasing, the continuity and uniformity of fluid flow are improve significantly. Under the experiment conditions of inlet feed rate 400 mL/min, height of the overflow plate 190 mm, spacing between overflow plates 6 mm, the calculated virtual cell number N of is close to the actual tanks number 5, the dimensionless variance is 0.2108, and the tanks reactor has better performance with idealized partitioning effect. This research can provide theoretical basis and guidance for the optimization design and enlargement test of the stirred tank for scheelite leaching in sulfuric-phosphorous mixed acid.
Key words: tanks reactor; particle suspension; computational fluid dynamics (CFD); residence time distribution (RTD); non-ideal flow mode
