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基于试验和数值分析的浮选机停留时间分布特性研究

有色金属(选矿部分)(2020)

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Abstract
浮选机停留时间分布研究对于认识大型浮选机内短路和死区等异常流动具有重要意义.本文采用示踪试验的方法研究了实验室和工业浮选机的停留时间分布特性.电导率示踪法可以有效应用于实验室浮选机的RTD研究,而荧光示踪法可以解决工业浮选机三相体系下的RTD研究.应用CFD方法研究了动态体系下浮选机的流态特征,揭示了示踪剂在浮选机内的流动过程,CFD方法揭示出浮选机内的停留时间分布特征与理想搅拌反应器相似,说明具有很好的搅拌混合效果.在世界最大的680m3浮选机开展了停留时间分布特征研究,平均停留时间达到理想平均停留时间的89%,说明浮选机内短路和死区等异常流动较少.
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要点】:本文通过示踪试验和计算流体动力学(CFD)方法研究了浮选机的停留时间分布特性,提出了一种适用于实验室和工业浮选机的新方法,并揭示了浮选机内部流态特征,创新点在于应用电导率示踪法和荧光示踪法对浮选机RTD特性进行研究。

方法】:作者采用电导率示踪法和荧光示踪法,结合CFD模型对浮选机的停留时间分布特性进行分析。

实验】:在实验室浮选机和680m³工业浮选机上开展示踪试验,利用CFD方法模拟了浮选机内部流态,实验结果显示工业浮选机的平均停留时间达到理想平均停留时间的89%,表明异常流动较少。