Influence of pressure on filtration of aqueous alumina suspensions

Hirata, Yoshihiro; Fukunaga, Takaaki; Matsunaga, Naoki; Sameshima, Soichiro

doi:10.1016/j.ceramint.2012.10.180

Cited by 9 publications

(10 citation statements)

References 12 publications

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“…The wider distribution of agglomerates in the slurry with PIBM in turn resulted in a higher particle packing density, as mentioned by Velamakanni et al Moreover, the slurry with PIBM generated larger drainage passages between agglomerates. These passages had high permeability to facilitate water expulsion under pressure and diminished the density difference in the resultant wet cake . It could be the reason for the relatively small density difference between the upper and bottom parts in WC‐PIBM (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…These passages had high permeability to facilitate water expulsion under pressure 5 and diminished the density difference in the resultant wet cake. 3 It could be the reason for the relatively small density difference between the upper and bottom parts in WC-PIBM ( Figure 2). Figure 6 illustrates typical agglomerate shapes in the slurries with PIBM and PAANH 4 .…”

Section: Effects Of Agglomeratesmentioning

confidence: 97%

“…Water in ceramic slurries is generally expelled through a porous filter, and remaining particles are rearranged layer by layer under an external pressure. It is a quite effective process to obtain wet cakes with a high particle packing density in a very short period …”

Section: Introductionmentioning

confidence: 99%

“…It is a quite effective process to obtain wet cakes with a high particle packing density in a very short period. 2,3 Generally, three different types of ceramic slurries, such as dispersed, flocculated, and coagulated, are used for pressure filtration. Dispersed slurries are pressure insensitive; Lange and Miller 4 prepared a dispersed alumina slurry (solid loading 20 vol%) by adjusting pH and achieved a particle packing density (volume fraction of particles) of 70 ± 2% under a pressure range of 0.5-80 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Density difference in pressure‐filtrated wet cakes produced from spontaneous gelling slurries

Shimai

Jian-Gao

et al. 2019

J Am Ceram Soc

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Pressure filtration is a key process in ceramic forming; however, the influences of density difference in different parts of a pressure‐filtrated wet cake on subsequent drying and sintering have not yet been explored. In the present work, alumina slurries dispersed by copolymers of isobutylene and maleic anhydride (PIBM) and ammonium salt of polyacrylic acid (PAANH4) were pressure filtrated to examine the impacts of density difference in the as‐prepared wet cakes. In comparison to the wet cake produced from PAANH4, the wet cake with PIBM had much higher bulk density and smaller density difference between its upper and bottom parts (height of ~23 mm). Furthermore, in order to reveal the differences between these two wet cakes, the nature of agglomerates in their slurries was investigated. The slurry with PIBM contained agglomerates with a wider size distribution, bigger average size, and higher sphericity, producing a wet cake with a higher particle packing density and more homogeneous packing structure after pressure filtration. Hence, almost no deformation occurred in a large wet cake (280 mm × 130 mm × 20 mm) with PIBM, whereas that with PAANH4 experienced a severe deformation after sintering.

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Section: Discussionmentioning

confidence: 99%

Section: Effects Of Agglomeratesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Density difference in pressure‐filtrated wet cakes produced from spontaneous gelling slurries

Shimai

Jian-Gao

et al. 2019

J Am Ceram Soc

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show abstract

“…In addition, the alumina particles were positively charged in order to produce a strong repulsive energy between them. The suspensions were stirred for 24 h and then consolidated to form a 20-mmdiameter and 5-mm-thick disk using pressure filtration equipment [19][20][21] at a crosshead speed of 0.2 mm/min up to 19 MPa. A three-layered membrane filter with a pore size of 100 nm was attached to the bottom of the piston in order to exhaust the solution through the internal piston pore.…”

Section: Fabrication Of Porous Alumina Compactsmentioning

confidence: 99%