固液两相耦合条件下全尾砂连续沉降规律研究

Experimental Study on Continuous Settlement Law Under Solid-Liquid Two Phase Coupling Conditions of Unclassified Tailings

针对江西某铅锌矿全尾砂难以浓缩的问题,研究探索添加絮凝剂提高其浓缩效果的可行性。对该全尾砂浆体分别进行固液两相耦合条件下静态和动态絮凝沉降正交试验,确定尾砂浆絮凝沉降规律,对絮凝剂选型、用量和给料速度等关键参数进行优化。结果表明:当给料速度由0.89 t(/m^2·h)减少至0.60 t(/m^2·h)时,溢流水固含量逐渐降低;当给料浓度为13.59%,AH-910-SH型絮凝剂浓度为20 g/t,给料速度为0.60 t(/m^2·h)时,底流浓度达到最大值72.82%,溢流水固含量为162.68×10^-6(<300×10^-6),絮凝沉降效果最佳。该试验为全尾砂快速沉降技术奠定了理论基础,同时为全尾砂高浓度充填方案选择提供了技术参考。

The technology of unclassified tailings high concentration backfilling has been applied to underground mining gradually.Because it has many advantages such as environmental protection,less dehydration,dispose more tailings.The grain size of tailings are getting smaller and smaller with the progress of beneficiation technology.This situation leads to the result of tailings concentration is unsatisfactory.Aiming at the difficulty of concentrating the super fine tailings of a lead-zinc mine in Jiangxi,this study explored the feasibility of adding flocculant to improve its concentration effect.On the basis of physical and chemical properties analysis for solid-liquid two phase coupling respectively under the condition of static and dynamic flocculation settlement of orthogonal test,we determine the tail slurry flocculating settling velocity in the enrichment,and by using the MATLAB software carry on the regression analysis of experimental data for the selection and dosage of flocculant,which provides the basis for the determination of optimal concentration of diluted slurry.Firstly,varieties and dosage of flocculants were determined through static natural settlement tests.Secondly,dynamic flocculation settling tests were conducted according to the varieties and dosage of flocculants that determined before.The influence of feeding speed to the clarity degree of overflow water and the underflow concentration were tested.The experimental results show that the feeding speed by 0.89 t/(m^2·h)reduced to 0.60 t/(m^2·h),overflow water solid content gradually decreased,when the feed concentration 13.59%,the concentration of the AH-910-SH type flocculant is 20 g/t,the feeding speed is 0.60 t/(m^2·h),the underflow concentration reached a maximum of 72.82%,the overflow water solid content is 162.68×10^-6(<300×10^-6),the superfine all backfilling flocculation sedimentation effect is best.This test provided theoretical basis to the rapid settlement technology of ultra-fine unclassified tailings.Thus,the test established the technical foundation of high concentration backfilling of ultra-fine unclassified tailings.The results of the study have certain significance for the application of continuous settlement technology of unclassified tailings.