煤泥水分级池分级效果模拟与试验研究

煤泥水分级处理可以提高粗粒级回收效率,改善中粒级浮选效率以及细粒级浓缩压滤效率。基于干扰沉降原理,设计了煤泥水分级池,应用计算流体力学方法对煤泥水分级池中各粒级颗粒的运动轨迹和分级效率进行了数值计算研究,解析了各粒级颗粒运动规律和分级机理,结果表明0.500~0.250,0.250~0.125,0.125~0.075,0.075~0.045,0.045 mm粒级分级错配率分别为0,0,2.08%,50.00%,29.90%;对煤泥水分级池进行了实验室实践研究,结果表明各粒级分级错配率分别为0,0,3.31%,30.06%,30.06%。计算结果与实践结果基本吻合,利用煤泥水分级池对煤泥水预先分级是可行的。

Simulations and experiments on the classification efficiency of slurry classifica-tion pond

Pre-classification is beneficial for slurry processing such as avoiding the repetitive treatment of coarse particles,enhancing the flotation efficiency of fine particles,and improving the concentration efficiency and pressure filtration efficiency of ultrafine particles.Based on the theory of hindered settling,the slurry classification pond was designed.Applying computational fluid dynamics method,the classification efficiencies and particle paths of every grade were calculated and simulated to reveal the motion law and classification mechanism.Hence the results show that the miscellany rates of 0.500-0.250,0.250-0.125,0.125-0.075,0.075-0.045 and <0.045 mm fractions respectively are 0,0,2.08%,50.00% and 29.90%.In comparison with the simulation experiments,the results of the laboratory experiments respectively are 0,0,3.31%,30.06% and 30.06%.The laboratory experimental results agree with the simulation results,and there is no doubt that slurry can be effectively classified by the slurry classification pond.