Multiphase behaviors in a multistage vanadium leaching tank with mechanical-vapor combined stirring

IF 5.5 3区 工程技术 Q1 ENGINEERING, CHEMICAL
Jing Li , Guoliang Wu , Qing Fang , Xueting Li , Jiahui Wang , Hua Zhang , Hongwei Ni
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引用次数: 0

Abstract

Background

The improvement of conventional mixing methods on the problems of uneven solid phase distribution and bottom mineral deposition in multi-stage vanadium-bearing shale agitated leach tanks is limited, and more novel mixing methods need to be proposed and developed.

Method

In this study, vapor-liquid-solid flow, dead-zone buildup and bubble residence time in a multistage vanadium-bearing shale leaching tank with inlet and outlet were numerically investigated and compared. Three different stirring methods, namely mechanical stirring, vapor blowing stirring, and combined mechanical vapor blowing stirring, were used to stir the samples, and different inlet speeds were compared, and the numerical models were validated by water modeling tests.

Significant Findings

The results showed that the combination of mechanical mixing and vapor blowing could reduce the ratio of the "dead zone", in which the top low-concentration zone was reduced from 0.84% to 0.178%, and the bottom deposition zone was reduced from 0.32% to 0.026% compared with only mechanical mixing. Increasing the inlet vapor flow rate would enhance the stirring effect of vanadium shale leaching tank and reduce the residence time of bubble particles in the tank. The minimum residence time of bubble particles was shortened from 10.05 s to 5.95 s, and the peak residence time of bubble particles and the distribution of vapor residence time were improved significantly. The combination of mechanical stirring and vapor blowing was favorable for solid-liquid two-phase leaching reaction. Increasing the flow rate could effectively reduce the effect of bubbles on the mixing of solid-liquid phase.

机械-蒸汽联合搅拌多级钒浸出槽中的多相行为
传统混合方法对多级含钒页岩搅拌浸出槽中固相分布不均和底部矿物沉积问题的改善有限,需要提出和开发更多新型混合方法。本研究对带进、出水口的多级含钒页岩浸出槽中的汽液固流动、死区积聚和气泡停留时间进行了数值研究和比较。采用机械搅拌、吹气搅拌和机械吹气联合搅拌三种不同的搅拌方式对样品进行搅拌,比较了不同的进气速度,并通过水模型试验对数值模型进行了验证。结果表明,与单纯的机械搅拌相比,机械搅拌和蒸汽喷吹相结合的方法可以降低 "死区 "比例,其中顶部低浓度区从 0.84% 降低到 0.178%,底部沉积区从 0.32% 降低到 0.026%。提高入口蒸汽流速可增强钒页岩浸出槽的搅拌效果,减少气泡颗粒在槽内的停留时间。气泡颗粒的最小停留时间从 10.05 秒缩短到 5.95 秒,气泡颗粒的峰值停留时间和蒸汽停留时间的分布也得到了明显改善。机械搅拌和蒸汽喷吹相结合的方法有利于固液两相浸出反应的进行。提高流速可有效降低气泡对固液相混合的影响。
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
CiteScore
9.10
自引率
14.00%
发文量
362
审稿时长
35 days
期刊介绍: Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.
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