搅拌槽内流体特征对絮凝特性的影响

在两种不同形状的搅拌槽中研究流体特征对微细粒赤铁矿絮凝特性的影响.试验结果表明:方形槽中,在转速1 000 r/min、作用时间4 min、轴向距离为2 cm的条件下能够形成粒径35.37 μm、分形维数1.628 9、沉降速度1.132 6 cm/s、密度4.62 g/cm3、孔隙率51.83%的絮凝体;圆形槽中,在转速1 100 r/min、作用时间4 min、轴向距离1.5 cm的条件下能够形成粒径35.67 μm、分形维数1.599 4、沉降速度1.063 7 cm/s、密度4.51 g/cm3、孔隙率54.38%的絮凝体.两者相比,方形槽中较小转速下就可获得更密实的絮凝体.

The Influence of Fluid Flow Features on Flocculation Characteristics in Stirred Tank

The influence of fluid flow features on flocculation characteristics of fine hematite was investigated in two stirred tanks with different shapes.The result showed that in the square tank, under the conditions of rotating speed of 1 000 r/min, reaction time of 4 min and axial distance of 2 cm, the floc was formed with an average diameter of 35.37μm, a fractal dimension of 1.628 9, a settling velocity of 1.132 6 cm/s, a density of 4.62 g/cm3 and a porosity of 51.83%.In the circular tank, under the conditions of rotating speed of 1 100 r/min, reaction time of 4 min and axial distance of 1.5 cm, the floc units was formed with an average diameter of 35.67 μm, a fractal dimension of 1.599 4, a settling velocity of 1.063 7 cm/s, a density of 4.62 g/cm3 and a porosity of 51.83%.In comparison, square tank could get the denser floc in low speeds.