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Experimental Investigation on Flowability and Compaction Behavior of Spray Granulated Submicron Alumina Granules

Aqueous slurry with various solid loadings (up to 40 wt%) of alumina powder (D = 300 nm) with suitable rheological properties were spray dried into granules. Solid loading and feed rate of the slurry are found to have a prominent effect on the shape and size distribution of granules. Powder flow mea... Full description

Journal Title: ISRN Ceramics 2013, Vol.2013, 6 pages
Main Author: Choudhary, Abhisek
Other Authors: Ramavath, Pandu , Biswas, Papiya , Ravi, Nukala , Johnson, Roy
Format: Electronic Article Electronic Article
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ID: E-ISSN: 2090-7508 ; DOI: 10.1155/2013/264194
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recordid: hindawi10.1155/2013/264194
title: Experimental Investigation on Flowability and Compaction Behavior of Spray Granulated Submicron Alumina Granules
format: Article
creator:
  • Choudhary, Abhisek
  • Ramavath, Pandu
  • Biswas, Papiya
  • Ravi, Nukala
  • Johnson, Roy
subjects:
  • Engineering
ispartof: ISRN Ceramics, 2013, Vol.2013, 6 pages
description: Aqueous slurry with various solid loadings (up to 40 wt%) of alumina powder (D = 300 nm) with suitable rheological properties were spray dried into granules. Solid loading and feed rate of the slurry are found to have a prominent effect on the shape and size distribution of granules. Powder flow measurements exhibited a cohesive index of 28.45 signifying an extremely cohesive flow due to high surface area and irregular morphology. Finer sizes though it offers high geometrical surface area it leads to more surface contacts and hence, high interparticle friction. Spherical morphology achieved through optimum spray drying parameters significantly reduced the cohesive index to 6.45 indicating free flow behavior. Compaction studies of the spray-dried granules and corresponding plot of relative density versus compaction pressure revealed an agglomerate strength of 500 MPa followed by a plateau-like behavior reaching a maximum in the relative density of 59%-60% of the theoretical values.
language:
source:
identifier: E-ISSN: 2090-7508 ; DOI: 10.1155/2013/264194
fulltext: fulltext
issn:
  • 2090-7508
  • 20907508
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titleExperimental Investigation on Flowability and Compaction Behavior of Spray Granulated Submicron Alumina Granules
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descriptionAqueous slurry with various solid loadings (up to 40 wt%) of alumina powder (D = 300 nm) with suitable rheological properties were spray dried into granules. Solid loading and feed rate of the slurry are found to have a prominent effect on the shape and size distribution of granules. Powder flow measurements exhibited a cohesive index of 28.45 signifying an extremely cohesive flow due to high surface area and irregular morphology. Finer sizes though it offers high geometrical surface area it leads to more surface contacts and hence, high interparticle friction. Spherical morphology achieved through optimum spray drying parameters significantly reduced the cohesive index to 6.45 indicating free flow behavior. Compaction studies of the spray-dried granules and corresponding plot of relative density versus compaction pressure revealed an agglomerate strength of 500 MPa followed by a plateau-like behavior reaching a maximum in the relative density of 59%-60% of the theoretical values.
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titleExperimental Investigation on Flowability and Compaction Behavior of Spray Granulated Submicron Alumina Granules
descriptionAqueous slurry with various solid loadings (up to 40 wt%) of alumina powder (D = 300 nm) with suitable rheological properties were spray dried into granules. Solid loading and feed rate of the slurry are found to have a prominent effect on the shape and size distribution of granules. Powder flow measurements exhibited a cohesive index of 28.45 signifying an extremely cohesive flow due to high surface area and irregular morphology. Finer sizes though it offers high geometrical surface area it leads to more surface contacts and hence, high interparticle friction. Spherical morphology achieved through optimum spray drying parameters significantly reduced the cohesive index to 6.45 indicating free flow behavior. Compaction studies of the spray-dried granules and corresponding plot of relative density versus compaction pressure revealed an agglomerate strength of 500 MPa followed by a plateau-like behavior reaching a maximum in the relative density of 59%-60% of the theoretical values.
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abstractAqueous slurry with various solid loadings (up to 40 wt%) of alumina powder (D = 300 nm) with suitable rheological properties were spray dried into granules. Solid loading and feed rate of the slurry are found to have a prominent effect on the shape and size distribution of granules. Powder flow measurements exhibited a cohesive index of 28.45 signifying an extremely cohesive flow due to high surface area and irregular morphology. Finer sizes though it offers high geometrical surface area it leads to more surface contacts and hence, high interparticle friction. Spherical morphology achieved through optimum spray drying parameters significantly reduced the cohesive index to 6.45 indicating free flow behavior. Compaction studies of the spray-dried granules and corresponding plot of relative density versus compaction pressure revealed an agglomerate strength of 500 MPa followed by a plateau-like behavior reaching a maximum in the relative density of 59%-60% of the theoretical values.
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