Simulation of flow field characteristics in scheelite leaching tank with H2SO4–H3PO4
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Jiangtao Li
Abstract
Digesting scheelite by using H2SO4–H3PO4 is an environment-friendly and low-cost technology. The key approach to achieving efficient scheelite decomposition involves providing a good environment with uniform material composition for the growth of calcium sulfate. Therefore, numerical simulation of gypsum particle suspensions in a square stirred tank with a frame-type agitator for leaching scheelite was investigated. Simulated optimized results showed that the homogeneity of a multiphase flow system increased with the speed of the agitator. Reducing off-bottom clearance eased the dispersion of gypsum into the liquid. Adding baffles increased turbulence intensity and axial velocity in the tank, which eased solid suspension. The suspension improved, together with increases in the torque and power requirements of the agitator when the speed changed and baffled were added. However, when the solid suspension improved, the stirring torque and power slightly decreased, under a different off-bottom clearance of the agitator. Meanwhile, with residence time distribution as an evaluation criterion, the experimental results verified that the flow characteristics of the solid particles improved after optimization. This study can provide a theoretical basis and guidance for the optimization of the design and enlargement test of the stirred tank for leaching scheelite with sulfuric–phosphorous mixed acid.
Funding source: National Natural Science Foundations of China
Award Identifier / Grant number: 51334008
Funding source: Changsha Outstanding Youth Program
Award Identifier / Grant number: kq2009032
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work has been jointly supported by the National Natural Science Foundations of China (No. 51334008) and Changsha Outstanding Youth Program (kq2009032) for financial support.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Artikel in diesem Heft
- Frontmatter
- Articles
- The strategy developed for high conversion and the multiplicity problems of biochemical reaction in a real CSTR with Cholette’s model
- Investigation on gas induction of liquid–gas ejector in jet loop reactor
- Design and simulation of a novel FOIMC-PD/P double-loop control structure for CSTRs and bioreactors
- Simulation of flow field characteristics in scheelite leaching tank with H2SO4–H3PO4
- Hydraulic characteristics of integrated settler based biofilm reactor as onsite sanitation system
- Potential of a mixed culture of microalgae for accumulation of beta-carotene under different stress conditions
- Simulation of heat transfer characteristics of tire particles in rotary kiln reactor
- Simultaneous removal of organics and bioenergy production by microbial fuel cell: modeling approach
- Optimization of slanted grooved micromixer with a serpentine channel at a lower Reynolds number
Artikel in diesem Heft
- Frontmatter
- Articles
- The strategy developed for high conversion and the multiplicity problems of biochemical reaction in a real CSTR with Cholette’s model
- Investigation on gas induction of liquid–gas ejector in jet loop reactor
- Design and simulation of a novel FOIMC-PD/P double-loop control structure for CSTRs and bioreactors
- Simulation of flow field characteristics in scheelite leaching tank with H2SO4–H3PO4
- Hydraulic characteristics of integrated settler based biofilm reactor as onsite sanitation system
- Potential of a mixed culture of microalgae for accumulation of beta-carotene under different stress conditions
- Simulation of heat transfer characteristics of tire particles in rotary kiln reactor
- Simultaneous removal of organics and bioenergy production by microbial fuel cell: modeling approach
- Optimization of slanted grooved micromixer with a serpentine channel at a lower Reynolds number
