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Increased agitation reliability for slurry suspension in mineral processing
Minerals Engineering ( IF 4.8 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.mineng.2021.107008
J. Wu , B. Nguyen , L. Graham , M. Hurley , D. Harris , G. Short , J. Kieruj , Tom Connor

Regular maintenance shutdowns are required for mineral processing tanks to clean sedimentation and scale. The labour cost and loss of production during maintenance negatively impact on the economics of the operation. Swirl Flow (SF) technology was developed to improve the reliability of agitation and to maximise tank online time between maintenance intervals. This technology simplifies the engineering in agitator mechanical design with reduced shaft length and removal of baffles. Tests showed that swirling flow could provide more energy efficient suspension compared with draft tubes or multiple impeller designs. It is demonstrated that SF is capable of suspending solids at very high concentration, which is impractical with a conventional agitator. A more uniform velocity over the tank wall surface is generated under SF, free of stagnant zones in the upper corner of the tank and other areas commonly encountered in conventional agitator designs. This feature reduces the formation of large lumpy scale that could form in the stagnant zones. Compared with a conventional agitator designs, SF provides mixing homogeneity with slightly longer mixing time.



中文翻译:

提高矿物加工中悬浮液的搅拌可靠性

矿物加工罐需要定期维护停机以清洁沉淀物和水垢。维护期间的劳动力成本和生产损失对运营的经济性产生负面影响。开发涡流 (SF) 技术是为了提高搅拌的可靠性并最大限度地延长维护间隔之间的罐在线时间。该技术通过减少轴长度和去除挡板简化了搅拌器机械设计的工程。测试表明,与尾流管或多叶轮设计相比,旋流可以提供更节能的悬浮液。结果表明,SF 能够以非常高的浓度悬浮固体,这对于传统的搅拌器来说是不切实际的。SF 下在罐壁表面上产生更均匀的速度,在罐的上角和传统搅拌器设计中常见的其他区域没有停滞区。该特征减少了可能在停滞区形成的大块状水垢的形成。与传统的搅拌器设计相比,SF 提供混合均匀性,混合时间稍长。

更新日期:2021-06-18
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