(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 利用計算流體力學(xué)(CFD)技術(shù)，對在使用框式攪拌槳條件下磷硫混酸浸出白鎢礦串聯(lián)方型攪拌槽內(nèi)的固體顆粒流動行為進(jìn)行了三維數(shù)值模擬及分析，探究進(jìn)口流速、溢流板高度、相鄰溢流板間距對串聯(lián)攪拌浸出槽的串聯(lián)分區(qū)效果的影響規(guī)律。以5槽串聯(lián)的浸出槽(單槽尺寸為200 mm×200 mm×310 mm)為例，進(jìn)行了槽內(nèi)流場特性模擬和實驗驗證。結(jié)果表明：利用溢流板串聯(lián)過后的連續(xù)攪拌酸浸槽內(nèi)會因為在相鄰的溢流板之間得不到有效攪拌作用而發(fā)生堆積現(xiàn)象；隨著溢流板高度的增高、溢流板間距的減小，白鎢礦連續(xù)酸浸槽內(nèi)串聯(lián)效果逐漸變好。實驗結(jié)果表明：當(dāng)進(jìn)口流量為400 mL/min、溢流板高度為190 mm、溢流板間距為6 mm時，計算得到的虛擬槽數(shù)N接近實際串聯(lián)的槽數(shù)5，無因次化方差為0.2108，多槽聯(lián)接的串聯(lián)效果良好。本研究為硫磷混酸連續(xù)浸出白鎢礦浸出槽的工業(yè)優(yōu)化設(shè)計提供了理論基礎(chǔ)和優(yōu)化方向。
關(guān)鍵字: 浸出槽；流動行為；計算流體力學(xué)(CFD)；停留時間分布(RTD)；非理想流動模型
（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
