Enhanced mechanical stirring by eccentric impeller stirring system in zinc hydrometallurgy process for cadmium removal

IF 1.6 4区工程技术 Q3 Chemical Engineering

International Journal of Chemical Reactor Engineering Pub Date : 2022-12-15 DOI:10.1515/ijcre-2022-0148

Wenjie Li, Shibo Wang, Hua Wang, Chunlin Li, Y. Zhai, Jianxin Xu, Q. Xiao

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Abstract

Abstract The fluid in the reactor can be poorly mixed, so an eccentric impeller is proposed to improve the fluid mixing efficiency. In this investigation, numerical simulations and cadmium removal experiments for the purification of zinc sulfate solution were conducted. The effect of eccentric impellers on the purification efficiency was discussed. The mechanism of the effect of concentric and eccentric arrangement of stirring impellers on mixing in the stirred tank was elucidated. The results showed that the average axial velocity of the eccentric impeller stirring system (EIS) was 131.52% of that of the concentric stirring system (CS) and 134.23% of that of the eccentric stirring system (ES). In the purification and removal of cadmium in the zinc hydrometallurgy experiment, unit ion purification energy was introduced to quantify the energy consumed for each 1% of Cd2+ removed. The eccentric impeller shortens the reaction time by 40% and reduces the reaction energy consumption by 31.8% compared to the non-eccentric impeller. Compared to CS and ES, EIS disrupts the periodicity of fluid flow and facilitates the destruction of isolated mixing regions. EIS can enhance mechanical stirring to improve purification efficiency.

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离心叶轮搅拌系统在湿法炼锌除镉工艺中的强化机械搅拌

摘要反应器中的流体可能混合不好，因此提出了一种偏心叶轮来提高流体混合效率。在本研究中，对硫酸锌溶液的净化进行了数值模拟和除镉实验。讨论了离心叶轮对净化效率的影响。阐述了搅拌桨同心和偏心布置对搅拌槽内混合的影响机理。结果表明，离心叶轮搅拌系统（EIS）的平均轴向速度是同心搅拌系统（CS）的131.52%，是偏心搅拌系统（ES）的134.23%。在锌湿法冶金实验中净化和去除镉的过程中，引入了单位离子净化能量来量化每去除1%的Cd2+所消耗的能量。与非偏心叶轮相比，偏心叶轮将反应时间缩短了40%，反应能耗降低了31.8%。与CS和ES相比，EIS破坏了流体流动的周期性，并有助于破坏孤立的混合区域。EIS可以增强机械搅拌，提高净化效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Chemical Reactor Engineering 工程技术-工程：化工

CiteScore

2.80

自引率

12.50%

发文量

107

审稿时长

3 months

期刊介绍： The International Journal of Chemical Reactor Engineering covers the broad fields of theoretical and applied reactor engineering. The IJCRE covers topics drawn from the substantial areas of overlap between catalysis, reaction and reactor engineering. The journal is presently edited by Hugo de Lasa and Charles Xu, counting with an impressive list of Editorial Board leading specialists in chemical reactor engineering. Authors include notable international professors and R&D industry leaders.