低阶煤浮选动力学过程研究

Kinetic process of low-rank coal flotation

针对可浮性差的低阶煤,设计了新型复配药剂FO3与柴油在浮选机转速为1 500,1 800,2 100,2 400和2 700r/min时的浮选速率试验,并依据经典一级动力学模型,计算出了各个浮选时间段的浮选速率常数.利用MATLAB软件得出了4种传统动力学模型对试验数据的拟合参数,并提出了适用于低阶煤浮选的新动力学模型.结果表明:在相同药剂量下,FO3能获得高于柴油20%左右的可燃体回收率;FO3作用的浮选过程浮选速率常数大,反应速率快;经典一级动力学模型和一级矩阵分布模型对FO3作用的浮选过程拟合较好,柴油作用的浮选过程更接近一级矩阵分布模型和二级动力学模型;新模型对低阶煤浮选过程有很好的适用性,和方差SSE均接近于0,R^2均趋近于1.

Flotation rate tests of low-rank coal were carried out with flotation speeds of 1 500,1 800,2 100,2 400 and 2 700r/min by using a new mixed reagent FO3 and diesel oil as collectors.The flotation rate constant values of different flotation periods were calculated according to the first-order kinetic model.Fitting parameters of four traditional kinetic models on experimental data were computed by MATLAB.A new kinetic model more suitable for low-rank coal flotation process was proposed.The results show that 20% higher combustible matter recovery was achieved by the application of FO3 than diesel oil.Compared with the flotation process of diesel oil,the flotation rate constant values of FO3 are greater and the flotation rate is faster.The first-order kinetic model and rectangular distributing model better fit the flotation by FO3,while the first-order rectangular distributing model and second-order kinetic model well match the flotation process by diesel oil.The new model is more applicable in low-rank coal flotation,as the values of SSEare close to 0and the values of R～2 approach 1.