Behaviours of Slurry Mixtures at Constant-Pressure Fiitration

TLDR: In this article, the filtration behavior of slurry mixtures consisting of two components, namely, Hongkong Kaolins "Pink" and "Dark-Yellow", was investigated.

Abstract: The filtration behaviours of the slurry mixtures consisting of two components with known filtration charactcristics, i.e., Hongkong Kaolins "Pink" and "Dark-Yellow, " were investigated. The equilibrium porosities eX, mass ratios of wet cake to dry cake mX', average specific resistances of cakes α'f·s·X, average effective specific surface areas Ss·X and Ruth's coefficients K'20·f·X of the slurry mixtures were studied in order to correlate them with those of the pure components. The characteristics of the two constituents are shown in Table 1 as well as in our former report3) Brief summaries of the results are as follows:(i) Average effective specific surface areas calculated from Eq. (6) were found to be not additive, on the volume basis, as shown in Fig. 7. In this case, (√k·S2s·X)P was always larger than (√k·S2s·X)l·P by about 11.8-0.1%, when the range for s=0.1-0.3 and P=500-9000[gr/cmcm2].(ii) The same tendency as in (i) was noticed of the results of permeability experiments as revealed in Fig. 3.(iii) Average specific resistance, α'f·s·X and K'20·f·X vs. X were rather complicated as shown in Figs. 8 and 9, respectively.(iv) (√k·S2s·X)P was nearly equal to (√k·S2s·X)l'P when the range of s≥0.2 and P=1000-9000 [gr/cmcm2]. The difference between them was less than 7.4%.(v) Due to the fact that the equilibrium porosities and mass ratios of wet cake to dry cake of each component were approximately equal, as shown in Table 1, the equilibrium porosity eX showed a linear relation against X' as represented by Eq. (1) and Fig. 2. Also mX vs. X was linear as represented by Eq. (2).