Abstract: The slurry concentration plays an important role in filtration. Four concepts of concentration are developed, the conventional concentration of slurry 5, which is the mass fraction of solids in slurry from the slurry-tank,, the average concentration during filtration Sav defined by Sav =Ws/(ρV + mavWs), the percentage variation of the average concentratin Eav defined by Eav=| (S-Sav)/S |×100%, and the instantaneous concentration of slurry in filtration St, which is the concentration at cake/slurry interface. On the basis of material balance, the equation of the instan taneous concentration of slurry in filtration is derived as follows: where ρs is the true density of cake solids, ρ the density of filtrate, A the filtration area, V the volume of filtrate, i the number of drainage surfaces, L the thickness of filter-chamber, and εi the porosity at cake/slurry interface which is determined by the Compression-Permeability Cell tes.tThe experiments to measure dV/d(L/i) in the equation were made by use of the experimental apparatus for hydraulic pressure distributions.

摘要： 本文对过滤过程悬浮液的平均浓度和瞬时浓度进行理论分析,并推导出相应的计算公式;同时,介绍一种测定瞬时浓度的实验方法.结果表明,通常情况下,采用通气搅拌、机械搅拌和循环流动三种恒浓度方法中的一种或两种,即能保证悬浮液浓度在过滤过程中基本上维持恒定.