Regularities in pressure filtration of fine and colloidal suspensions

Raha, Sasanka; Khilar, Kartic C.; Kapur, P.C.; Pradip,

doi:10.1016/j.minpro.2006.07.013

Cited by 19 publications

(35 citation statements)

References 32 publications

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“…A plasma CVD-processed ¢-SiC powder (SiC B) supplied by Sumitomo Osaka Cement Co., Ltd., Tokyo, has the following characteristics: chemical composition-SiC 95.26 mass %, SiO 2 0.97 mass %, C 3.76 mass %, median size 30 nm, aspect ratio 1.21, true density 3.10 g/cm 3 , specific surface area 50.4 m 2 /g. Another ¢-SiC powder (SiC C) was supplied by Ibiden Co. Ltd., Gifu, Japan: chemical composition-SiC 97.35 mass %, SiO 2 0.29 mass %, C 2.13 mass %, median size 330 nm, aspect ratio 1.42, true density 3.15 g/cm 3 , specific surface area 18.5 m 2 /g.…”

Section: Methodsmentioning

confidence: 99%

“…Another ¢-SiC powder (SiC C) was supplied by Ibiden Co. Ltd., Gifu, Japan: chemical composition-SiC 97.35 mass %, SiO 2 0.29 mass %, C 2.13 mass %, median size 330 nm, aspect ratio 1.42, true density 3.15 g/cm 3 , specific surface area 18.5 m 2 /g. As-received SiC B and C powders were dispersed at 5 and 20 vol %, respectively, in aqueous solutions with phenylalanine (C 6 20) SiC A powder (¡-SiC) supplied by Yakushima Electric Industry Co., Ltd., Kagoshima, Japan has following characteristics: chemical composition-SiC 98.90 mass %, SiO 2 0.66 mass %, Al 0.004 mass %, Fe 0.013 mass %, free C 0.37 mass %, median size 800 nm, aspect ratio 1.24, true density 3.23 g/cm 3 and specific surface area 13.4 m 2 /g. The zeta potential of SiC A, B and C particles was measured at a constant ionic strength of 0.001 M-NH 4 NO 3 (Rank Mark II, Rank Brothers Ltd., Cambridge, UK).…”

Section: Methodsmentioning

confidence: 99%

“…When 0.05 mass % phenylalanine is added, the SiOH 2 + sites are covered with neutral phenyl group through the adsorption of COO ¹ group of phenylalanine, resulting in the increased total potential to negative value. With the further addition of phenylalanine (0.050.5 mass %), the negatively charged SiO ¹ sites are covered with neutral phenyl group through the electrostatic interaction of NH 3 + group. As a result, the covered SiC surface is changed from negative one (SiO ¹ site) to neutral one (phenyl group), increasing the total surface potential to the positive value with addition of phenylalanine.…”

Section: Where Bsmentioning

confidence: 99%

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Consolidation behavior of nanometer-sized SiC particles with phenylalanine through pressure filtration at 1 MPa

Matsunaga

Yamashita

Hirata

2011

J. Ceram. Soc. Japan

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The consolidation behavior of two kinds of colloidal SiC particles (30 and 330 nm diameters) with and without phenylalanine dispersant (C 6 H 5 CH 2 CHNH 3 + COO ¹ ) at pH 7 was examined using a developed pressure filtration apparatus at 1 MPa of applied pressure. The height of 5 vol %-30 nm SiC suspension with and without phenylalanine as a function of filtration time was well simulated by a filtration model developed for a flocculated suspension rather than a traditional filtration model for a dispersed suspension. The result with phenylalanine is related to the colloidal phase transition from well dispersed particles to flocculated particles under an applied pressure of 1 MPa. The consolidation time became longer as the amount of phenylalanine added exceeded 0.1 mg/m 2 -SiC. However, the packing density of 30 nm SiC particles after consolidation increased from 35% for no addition of phenylalanine to 3742% for 0.11 mg phenylalanine/m 2 -SiC. The consolidation behavior of 20 vol %-330 nm SiC suspension with and without phenylalanine was also well expressed by the filtration model for a flocculated suspension. A longer consolidation time was also measured for the addition of phenylalanine above 1 mg/m 2 -SiC. However, the packing density (49%) of 330 nm SiC particles increased scarcely to 52% by the addition of phenylalanine (2.68 © 10 ¹2 2.85 mg/m 2 -SiC).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Where Bsmentioning

confidence: 99%

See 1 more Smart Citation

Consolidation behavior of nanometer-sized SiC particles with phenylalanine through pressure filtration at 1 MPa

Matsunaga

Yamashita

Hirata

2011

J. Ceram. Soc. Japan

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“…The principles of the models presented have been applied and further developed by many research organisations both within paper research and for other materials (e.g. Rainey 2009;Martinez et al 2001;Holmqvist and Dahlkild 2008;Raha et al 2007). This study follows their analysis of a one-dimensional constant rate filtration using an initially networked suspension.…”

Section: The Dynamic Filtration Model ('The Dynamic Model')mentioning

confidence: 99%

Pressure Filtration of Australian Bagasse Pulp

et al. 2010

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A one-dimensional pressure filtration model that can be used to predict the behaviour of bagasse pulp has been developed and verified in this study. The dynamic filtration model uses steady state compressibility parameters determined experimentally by uniaxial loading. The compressibility parameters M and N for depithed bagasse pulp were determined to be in the ranges 3000-8000 kPa and 2.5-3.0 units, respectively. The model also incorporates experimentally determined steady state permeability data from separate experiments to predict the pulp concentration and fibre pressure throughout a pulp mat during dynamic filtration. Under steady state conditions, a variable Kozeny factor required different values for the permeability parameters when compared to a constant Kozeny factor. The specific surface area was 25-30% lower and the swelling factor was 20-25% higher when a variable Kozeny factor was used. Excellent agreement between experimental data and the dynamic filtration model was achieved when a variable Kozeny factor was used.

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“…A number of works deal with the influence of the solid loading and dispersion state of suspension during PF, and their relation to green microstructure [6,[8][9][10], but only a few is focused at the properties of sintered material prepared from these suspension [11,12]. Uchikoshi et al [12] prepared compacts from two suspensions: well-dispersed and insufficiently dispersed suspensions of fine zirconia powder.…”

Section: Introductionmentioning

confidence: 99%