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全尾砂絮凝沉降規律及其機理

Rule and mechanism of flocculation sedimentation of unclassified tailings

  • 摘要: 以某礦全尾砂和聚丙烯酰胺(PAM)為實驗原料進行靜態絮凝沉降實驗,研究給料濃度和絮凝劑單耗對尾礦最大沉降速度和靜止沉降極限濃度的影響,通過對實驗數據回歸分析得出簡易的沉降速度模型.將模型劃分為六個階段,包括紊流影響段、加速沉降段、沉降末速段、干涉沉降區、壓密沉降段和極限沉降段,并利用兩相流理論、絮凝理論對其合理性進行闡述.實驗結果證明:在單耗一定(20g·t-1)時,沉降速度與給料濃度負相關,極限濃度與給料濃度正相關;在給料質量分數20%時,單耗臨界值為30g·t-1,極限濃度與單耗負相關.建議深錐濃密機給料質量分數20%,絮凝劑單耗20g·t-1.

     

    Abstract: Static flocculation and sedimentation experiments with polyacrylamide and unclassified tailings from a mine were completed to study the effects of feeding concentration and flocculants’ unit consumption on the maximum sedimentation velocity and limit concentration of tailings under static sedimentation.A simple model of sedimentation velocity was established through regression analysis on experimental data.The model was divided into six phases including turbulent flow affected segment,accelerating sedimentation segment,terminal velocity segment,interference sedimentation segment,dewatering sedimentation segment,and limit sedimentation segment.The rationality of the model was explained by the two-phase flow theory and the flocculation theory.The results show that at a certain unit consumption of flocculants (20g·t-1),the sedimentation velocity is negatively correlated and the limit concentration is positively correlated to the feeding concentration.At the feeding concentration of 20%,the critical value of unit consumption is 30g·t-1,and the limit concentration is negatively correlated to the unit consumption.A project was proposed that the feeding concentration is 20% and the unit consumption of flocculants is 20g·t-1.

     

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