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【简答题】
在实验室中用一个每边长0.162m的小型滤框对CaCO 3 颗粒在水中的悬浮液进行过滤实验。料浆温度为19℃，其中CaCO 3 固体的质量分数为0.0723。测得每1m 3 滤饼烘干后的质量为1602kg。在过滤压强差为275800Pa时所得的数据列于本题附表中。 习题9附表 过滤时间θ/s 1.8 4.2 7.5 11.2 15.4 20.5 26.7 33.4 41.0 48.8 57.7 67.2 77.3 88.7 滤液体积V/L 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 试求过滤介质的当量滤液体积V e 滤饼的比阻r，滤饼的空隙率ε及滤饼颗粒的比表面积a。已知CaCO 3 颗粒的密度为2930kg/m 3 ，其形状可视为圆球。
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