基于静态沉降试验的全尾砂浓密技术参数预测

Prediction of Technical Parameters of Full Tailings Thickening Based on Static Settlement Test

为了研究全尾砂浆浓密技术参数与尾砂物理性质之间的定量关系,对9个金属矿山的全尾砂进行了静态沉降试验。首先测定了这9个金属矿山全尾砂的粒径组成和密度大小,然后对这9个金属矿山的全尾砂分别进行了絮凝沉降试验。试验结果表明:料浆的底流浓度和沉降试验所需絮凝剂用量仅与尾砂的粒径有关,而与尾砂的密度无关,尾砂粒径越粗,底流浓度越高,试验所需絮凝剂用量就越少;单位面积尾砂通过量与尾砂粒径和密度均有关系,尾砂粒径和密度越大,固体通量越大;进一步回归分析得到了全尾砂粒径组成和密度大小与底流浓度、固体通量的关系方程。将计算结果与试验结果进行对比分析,发现预测值与试验值相差很小,证明本研究推导的关系方程方便可行,具有很好的推广应用价值。

At present,most of the researches on the thickening performance of tailings are macro researches,and the focus of the research is to improve the settlement performance parameters of mortar by using certain agents,technical means or methods. However,there is no micro research and no in-depth study on what causes the great difference in the thickening properties between different tailings. At present,there is no systematic study on the influence of density and particle size on solid flux and underflow concentration. This paper tries to analyze the main factors affecting the flocculation thickening effect by doing a large number of static sedimentation tests,and to study the quantitative relationship between the technical parameters of full tailing mortar thickening and the physical properties of tailings. Therefore,the particle size composition and density of the tailings of nine metal mines were measured first,and then the flocculation sedimentation tests of the whole tailings of these nine metal mines were carried out. The optimal pulp dilution concentration,underflow concentration,flocculant type,flocculant dosage and tailings throughput per unit area of the 9 typical mines were obtained. The results show that the underflow concentration of slurry,the change of slurry concentration and the amount of flocculant required for sedimentation test are only related to the particle size of tailings,and have nothing to do with the density of tailings. The coarser the particle size is,the higher the underflow concentration is,and the less flocculant dosage is required for the test. The larger the particle size and density of tailings are,the higher the solid flux is. Furthermore,the mathematical relationship between the factors was fitted by the dimensionless regression analysis method,and the relationship equation between the median particle size of tailings and underflow concentration was obtained,the relationship equation between the control particle size of tailings and the concentration change was obtained,and the relationship equation between the particle size,density,concentration and solid flux was obtained. Comparing the calculation results with the test results,it is found that the difference between the predicted value and the test value is very small,which proves that the derived relationship equation is convenient and feasible,and has a good application value.