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| Numerical Simulation on Optimization of Stirring Speed in Vanadium Shale Leaching Tank |
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Received:September 03, 2021
Revised:September 17, 2021
Accepted:September 18, 2021
Published Online:December 17, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2022.01.010 |
| KeyWord:vanadium shale; leaching tank; numerical simulation; rotating speed of blade; stirring power |
| Author | Institution |
| WU Guo-liang |
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室 |
| NI Hong-wei |
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室 |
| FANG Qing |
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室 |
| WANG Jia-hui |
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室 |
| ZHAO Peng |
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室 |
| ZHANG Hua |
武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室 |
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| Abstract: |
| Vanadium-containing shale leaching tank is main operating unit of wet process for vanadium leaching section of vanadium shale, with problems such as uneven solid phase distribution and easy deposition of trough bottom minerals. Effects of two-phase flow on solid liquid in mixing tank were comparatively analyzed by numerical simulation under conditions of double-layer impeller at the same speed and different speed. The results show that when rotating velocity of double-layer impeller blades changes from 1.3 r/s to 1.7 r/s, volume of dead zone drops from 5.02 m3 to 2.03 m3, mixing time drops from 1 501 s to 1 116 s, and average velocity of near free surface rises from 0.32 m/s to 0.56 m/s. Therefore, it is more appropriate to choose 1.7 r/s stirring speed. When rotating velocity of upper impeller blade changes from 1.5 r/s to 1.7 r/s, volume of dead zone drops from 2.95 m3 to 2.33 m3, mixing time drops from 1 261 s to 1 146 s, and average velocity of near free surface rises from 0.44 m/s to 0.54 m/s. Therefore, when rotating velocity of upper impeller blade is 1.7 r/s and lower blade is 1.5 r/s, stirring power can be kept at relatively low level, and stirring efficiency can reach a high level. |
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