工程科学学报，第39卷.第1期：54-60.2017年1月 Chinese Journal of Engineering,Vol.39,No.1:54-60,January 2017 D0L:10.13374/j.issn2095-9389.2017.01.007;htp:/journals.ustb.edu.cn 高固含固液搅拌槽内颗粒悬浮与混合特性 赵洪亮12)，殷攀)，张立峰12)回 1)北京科技大学冶金与生态工程学院，北京1000832)稀贵金属绿色回收与提取北京市重点实验室，北京100083 ☒通信作者，E-mail:zhanglifeng@usth.edu.cn 摘要对高固含体系下Intermig桨搅拌槽内的桨叶搅拌性能以及颗粒的混合与悬浮特性进行实验研究.采用光导纤维技 术对不同桨径、搅拌转速和桨叶离底距离下搅拌槽内底部以及轴向颗粒密度进行测量，同时对临界悬浮转速和搅拌功率进行 测定.实验结果表明：对高固含液-固搅拌体系，所采用的Intermig搅拌桨具有很好的轴向混合特性，该桨适合在较大的桨径 和较低的桨叶离底距离下应用，可在促进颗粒悬浮与均匀分布的同时，大大降低功率消耗.通过对实验结果的分析和拟合得 出底部均匀度与搅拌槽内弗劳德数有关，Q=0.58F,~a5,Intermig搅拌桨功率准数在0.2-0.3之间，且与雷诺数关系为Np= 2.1Re-a2. 关键词搅拌槽反应器；颗粒：混合特性：悬浮 分类号TQ027.1 Particle suspension and mixing characteristics in a solid-liquid stirred tank with high solid content ZHAO Hong-liang'2),YIN Pan),ZHANG Li-feng) 1)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Key Lab of Rare Precious Metals Green Recycling and Extraction,Beijing 100083,China Corresponding author,E-mail:zhanglifeng@ustb.edu.cn ABSTRACT The suspension and mixing characteristics of high-content solid particles were experimentally studied in a tank stirred with an Intermig impeller.An optical fiber technology was adopted to measure the bottom and axial solid concentration under different conditions of impeller diameter,rotational speed and impeller-bottom distance,and the critical suspension speed and power consump- tion were also investigated at the same time.The results show that the Intermig impeller has good axial mixing performance in the solid- -liquid stirred system with high solid content.High impeller diameter and low impeller-bottom distance could improve the solid sus- pension and uniform distribution with low power consumption.By analyzing and fitting the experimental results,the bottom solid uni- formity is calculated by Froude number with the equation of =0.58Fand the power number is calculated by Reynolds number with the equation of N=2.1Re2 KEY WORDS stirred tank reactor;particles;mixing characteristics;suspension 铝酸钠溶液的晶种分解是拜耳法生产氧化铝的一的物料混合、分解率以及产品质量起着至关重要的作 个关键工序，其过程涉及复杂的物理化学过程，因此也用.搅拌在晶种分解过程中起到保持晶种处于悬浮状 受到诸多因素的影响四.尽管目前对晶种分解的机理态的作用，防止底部积料，产生结疤：另一方面使晶种 的阐述仍存在许多分歧，但搅拌无疑对晶种分解过程 与溶液充分接触，促进液、固两相的均匀混合，强化传 收稿日期：2016-04-07 基金项目：国家自然科学基金资助项目(51504018)：中国博士后科学基金资助项目(2015M580986):中央高校基本科研业务费资助项目 (FRF-TP-15-069A1)工程科学学报,第 39 卷,第 1 期:54鄄鄄60,2017 年 1 月 Chinese Journal of Engineering, Vol. 39, No. 1: 54鄄鄄60, January 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 01. 007; http: / / journals. ustb. edu. cn 高固含固液搅拌槽内颗粒悬浮与混合特性 赵洪亮1,2) , 殷 攀1) , 张立峰1,2) 苣 1) 北京科技大学冶金与生态工程学院, 北京 100083 2) 稀贵金属绿色回收与提取北京市重点实验室, 北京 100083 苣 通信作者,E鄄mail: zhanglifeng@ ustb. edu. cn 摘 要 对高固含体系下 Intermig 桨搅拌槽内的桨叶搅拌性能以及颗粒的混合与悬浮特性进行实验研究. 采用光导纤维技 术对不同桨径、搅拌转速和桨叶离底距离下搅拌槽内底部以及轴向颗粒密度进行测量,同时对临界悬浮转速和搅拌功率进行 测定. 实验结果表明:对高固含液鄄鄄固搅拌体系,所采用的 Intermig 搅拌桨具有很好的轴向混合特性,该桨适合在较大的桨径 和较低的桨叶离底距离下应用,可在促进颗粒悬浮与均匀分布的同时,大大降低功率消耗. 通过对实验结果的分析和拟合得 出底部均匀度与搅拌槽内弗劳德数有关,Q = 0郾 58Fr - 0郾 35 ,Intermig 搅拌桨功率准数在 0郾 2 ~ 0郾 3 之间,且与雷诺数关系为 NP = 2郾 1Re - 0郾 2 . 关键词 搅拌槽反应器; 颗粒; 混合特性; 悬浮 分类号 TQ027郾 1 Particle suspension and mixing characteristics in a solid鄄鄄liquid stirred tank with high solid content ZHAO Hong鄄liang 1,2) , YIN Pan 1) , ZHANG Li鄄feng 1,2) 苣 1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Beijing Key Lab of Rare & Precious Metals Green Recycling and Extraction, Beijing 100083, China 苣 Corresponding author, E鄄mail: zhanglifeng@ ustb. edu. cn ABSTRACT The suspension and mixing characteristics of high鄄content solid particles were experimentally studied in a tank stirred with an Intermig impeller. An optical fiber technology was adopted to measure the bottom and axial solid concentration under different conditions of impeller diameter, rotational speed and impeller鄄鄄bottom distance, and the critical suspension speed and power consump鄄 tion were also investigated at the same time. The results show that the Intermig impeller has good axial mixing performance in the solid鄄 鄄liquid stirred system with high solid content. High impeller diameter and low impeller鄄鄄 bottom distance could improve the solid sus鄄 pension and uniform distribution with low power consumption. By analyzing and fitting the experimental results, the bottom solid uni鄄 formity is calculated by Froude number with the equation of Q = 0郾 58Fr - 0郾 35 and the power number is calculated by Reynolds number with the equation of NP = 2郾 1Re - 0郾 2 . KEY WORDS stirred tank reactor; particles; mixing characteristics; suspension 收稿日期: 2016鄄鄄04鄄鄄07 基金项目: 国家自然科学基金资助项目(51504018);中国博士后科学基金资助项目(2015M580986);中央高校基本科研业务费资助项目 (FRF鄄鄄TP鄄鄄15鄄鄄069A1) 铝酸钠溶液的晶种分解是拜耳法生产氧化铝的一 个关键工序,其过程涉及复杂的物理化学过程,因此也 受到诸多因素的影响[1] . 尽管目前对晶种分解的机理 的阐述仍存在许多分歧,但搅拌无疑对晶种分解过程 的物料混合、分解率以及产品质量起着至关重要的作 用. 搅拌在晶种分解过程中起到保持晶种处于悬浮状 态的作用,防止底部积料,产生结疤;另一方面使晶种 与溶液充分接触,促进液、固两相的均匀混合,强化传