全尾砂物理特性对絮凝沉降性能影响规律的研究

随着浅部矿产资源的日益枯竭，矿山开采深度逐渐增加，而深部开采环境非常复杂且开采难度更大，加之我国对环境保护工作的高度重视，充填采矿法逐渐成为我国矿山首选的采矿方法。为研究尾砂物理特性对絮凝沉降性能的影响规律，开展了粒级组成、比重对尾砂沉降效果影响的静态絮凝沉降试验。研究结果表明：尾砂的中值粒径与沉降速度、底流浓度成正相关；-200目粒径含量与沉降速度、底流浓度在一定范围内成负相关；构建了-200目粒径含量、尾砂比重、中值粒径与沉降速度、底流浓度的数学方程，对尾砂浆絮凝沉降速度的影响程度上，-200目粒径含量>中值粒径>尾砂比重；对尾砂底流浓度的影响程度上，中值粒径>-200目粒径含量>尾砂比重。尾砂粒径大小对浓缩效率影响较大，本研究可为全尾砂絮凝沉降效率提升及底流浓度调控提供依据。

Study on the Effect of Physical Properties of Full Tailings on Flocculation and Sedimentation Performance

With the depletion of shallow mineral resources and the implementation of the national environmental protection policy，the filling mining method has gradually become the preferred mining method for major mines.In order to study the influence of the tailings own characteristics on the performance of flocculation and settlement during the filling process，the influence of the tailings own physical characteristics on the settlement effect was investigated by conducting flocculation and settlement experiments on four different tailings at the same feeding concentration，flocculant type and dosage.The experimental results and regression analysis show that the specific gravity，median particle size and -200 mesh particle content of the tailing sand are not mono-tonically correlated with the settling velocity and bottom flow concentration，and there is no simple univariate correlation between them，and the fitted equations are not well fitted by non-linear regression.The median particle size of the tailing sand show a positive correlation with the settling velocity and the bottom flow concentration.The -200 mesh particle content is negatively correlated with the settling velocity and bottom flow concentration in the process of flocculation and settling，and the fit is high，which has a higher degree of influence on the settling effect.The single-factor correlation of specific gravity of tailings，median particle size with settling velocity and bottom flow concentration is low，and the regression equation of these three factors with settling velocity and bottom flow concentration is obtained by multiple linear regression using SPSS software，and the significance of these factors is further analyzed.For the influence degree of flocculation settling velocity of tailings mortar，-200 mesh particle content > median particle size > proportion of the tailings.For the influence degree of tailings bottom flow concentration，median particle size >-200 mesh particle con-tent > proportion of the tailings.