Numerical Simulation of Solid-Liquid Mixing in Stirred Tank During Decyanation Process of Gold-Containing Wastewater
Received date: 2016-06-28
Revised date: 2016-08-30
Online published: 2016-12-27
In order to improve the decyanation stirring effect of gold-containing wastewater in the stirred tank，a numerical simulation of the flow field and the solid-liquid dispersion was carried out.Multiple reference frame method and Euler- Euler model are used in the simulation experiment.The effects of rotational speed，eccentricity on the velocity field，flow pattern，solid holdup distribution and mixing power in the decyanation process were investigated.The results show that the eccentric mixing can significantly improve the symmetric velocity field and flow pattern，and the flow field is the best when the eccentricity is e=0.2.The near wall lateral flow is enhanced when eccentricity is greater than 0.2，the near-wall circular vortex close to blade area.There is a large circular vortex with weak turbulence in far-wall area，which is not conducive to mixing.Eccentricity is conducive to the dispersion of decyanation agent in the 0~0.2 range.But a large degree of eccentricity will cause the accumulation of cyanide in the near wall side baffle plate.Agitation speed increased from 100 r/min to 1 200 r/min，the power growth rate is more and more fast.The power of two phase mixing is 8.8% higher than that of single phase stirring.Eccentric agitation has the energy saving effect，when the eccentricity increases from 0 to 0.43，the stirring power is reduced by 3.9%.
SHENG Yong , LIU Tingyao , HAN Lihui , LIU Qing . Numerical Simulation of Solid-Liquid Mixing in Stirred Tank During Decyanation Process of Gold-Containing Wastewater[J]. Gold Science and Technology, 2016 , 24(5) : 108 -114 . DOI: 10.11872/j.issn.1005-2518.2016.05.108
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