搅拌流场中微细粒赤铁矿絮凝动力学研究

发布时间：2018-04-18 07:16

本文选题：搅拌 + 流场　；参考：《矿产保护与利用》2017年05期

【摘要】：主要研究了搅拌转速与搅拌桨距槽底轴向距离对絮凝动力学的影响。研究结果表明:提高搅拌转速有利于提高絮凝体初始生长速率,但超过一定转速絮凝体初始生长速率常数K值变化不明显。当搅拌转速由900 r/min上升至1 000 r/min、1 100 r/min时,絮凝体初始生长速率常数K由0.008 5上升至0.012 3和0.012 5,分别升高了0.003 8和0.004 0;搅拌桨距槽底轴向距离对絮凝体初始速率的影响存在一定限制,当轴向距离由15 mm升至20 mm、25 mm时,絮凝体生长速率常数K值由0.009 7上升至0.012 1、0.010 9,分别增加0.002 4和0.001 2。通过修正絮凝动力学公式得出能够描述较大时间跨度下的絮凝过程的动力学公式。
[Abstract]:The effects of stirring speed and axial distance from bottom of tank to flocculation kinetics were studied.The results show that the initial growth rate of flocculants can be increased by increasing the stirring speed, but the change of K value of initial growth rate constant is not obvious when the initial growth rate constant of flocculants exceeds a certain speed.When the stirring speed increased from 900 r/min to 1 000 r / min 1 100 r/min,The initial growth rate constant K increased from 0.008 5 to 0.012 3 and 0.012 5, which increased 0.003 8 and 0.004 0, respectively. The influence of axial distance from the bottom of the tank to the initial rate of flocculation was limited, when the axial distance increased from 15 mm to 20 mm ~ 25 mm.The growth rate constant K value of flocculants increased from 0.009 7 to 0.012 1 L 0.010 9, increasing by 0.002 4 and 0.001 2, respectively.By modifying the flocculation kinetic formula, a kinetic formula can be obtained to describe the flocculation process in a long time span.
【作者单位】：华北理工大学矿业工程学院;河北省矿业开发与安全技术重点实验室;
【基金】：国家自然科学基金资助(51474087) 河北省高校百名优秀创新人才支持计划(BR2-214)
【分类号】：TD951

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