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.
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.