全尾砂浓密特性研究及其在浓密机设计中的应用

在实验装置中添加了转子导流系统,使模型装置更接近于现场高效浓密机.采用均匀设计方法,以单位面积固体处理量和底流体积分数作为尾砂浓密效果的评价指标,考察各因素对尾砂浓密效果的影响.结果表明:单位面积固体处理量与絮凝剂单耗正相关,最佳入料体积分数为6.56%;底流体积分数与入料体积分数、停留时间和絮凝剂单耗均正相关.最后通过凯奇沉降模型对沉降曲线进行分析,速度限制层一般为过渡区与压缩区的交界处,根据实验结果和尾砂日处理量计算得出浓密机的最小直径为14m.

Study on the thickening properties of unclassified tailings and its application to thickener design

A rotor was added to the experimental apparatus,making the apparatus more similar to an in-situ high-capacity thickener.With solid handling capacity per unit area and underflow volume concentration as two evaluating indicators of tailings thickening effect,the influence of some factors on tailings thickening effect was investigated using a uniform design method.It is shown that there is a positive correlation between the solid handling capacity per unit area and the flocculant's dosage,and the best feed volume concentration is 6.56%.The underflow volume concentration is of positive correlation with feed volume concentration,residence time and the flocculant's dosage,respectively.Through analyzing the settlement curve with a Cage settlement model,it is concluded that the speed limit layer is typically the separate layer of the transition region and the compression region.Based on experimental results and tailings handling capacity daily,the minimum diameter of a thickener is 14 m.