Experimental studies on distributions of granule size, binder content and porosity in batch drum granulation: Inferences on process modelling requirements and process sensitivities

Ramachandran, Rohit; Poon, Jonathan M.-H.; Sanders, C.F.; Gläser, Thomas; Immanuel, Charles D.; Doyle, Francis J.; Litster, James D.; Štěpánek, František; Wang, Fu Yang; Cameron, Ian

doi:10.1016/j.powtec.2008.04.013

Cited by 74 publications

(22 citation statements)

References 35 publications

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“…Powder properties such as powder size, powder density and particle shape play an important role in the final size distribution as well as the strength of the granules formed. Liquid properties such as viscosity and surface tension are also important, and further, a trade-off between these two properties needs to be identified [40]. The bed wetting conditions have a significant influence on the nucleation and growth of agglomerates [41].…”

Section: Tests Resultsmentioning

confidence: 99%

Spectrophotometric analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite

Obraniak

Ławińska²

2017

Granular Matter

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The analysis of mechanisms which affect the formation of agglomerates and determine the granulation process in a broad sense encounters difficulties related to the many ways of the formation of granules. The aim of the study was to perform a qualitative and quantitative analysis of granulation mechanisms with special reference to agglomerates' disintegration in the disc granulation process. This paper contains an analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite. The analysis of the mechanisms taking place during the process concerns the granulation stage after wetting. During the research, each time after the wetting stage, the size fraction 10-12.5 mm was substituted with an analogous fraction wetted by means of an aqueous solution of a coloring agent and the process was continued. After the specified time of granulation, the obtained product was sieved through laboratory sieves and then the content of the provided coloring agent in different size fractions was analyzed by means of a spectrophotometer. Measuring the absorbance of the analyzed samples and granulometric composition of the bed, the level and cause of the migration of material of the tested fraction into other size classes were determined, and at the same time, the occurring granulation mechanisms were analyzed. The proposed model and measurement method consisting of determining the absorbance of the tested granulometric fraction enable the qualitative and quantitative analysis of granulation mechanisms are encountered during the carrying-out of the process after wetting the bed.

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Section: Tests Resultsmentioning

confidence: 99%

Spectrophotometric analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite

Obraniak

Ławińska²

2017

Granular Matter

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“…Dentre outros equipamentos que envolvem escoamentos granulares, destaca-se o tambor rotatório, largamente utilizado em processos tais como, granulação (RAMACHANDRAN et al, 2008), mistura (MARIGO et al, 2012), moagem (METZGER e GLASSER, 2013), fermentação (LU et al, 2013), secagem (LOBATO et al, 2008;ARRUDA et al, 2009;FERNANDES et al, 2009;SILVA et al, 2012;SILVÉRIO et al, 2014) e recobrimento (SUZZI et al, 2012). Apesar de possuir uma geometria relativamente simples, muitos estudos em tambores rotatórios tem se concentrado nas complexas interações partícula-partícula e partícula-parede no interior deste equipamento.…”

Section: Introductionunclassified

Calibração Da Metodologia Numérica Dem E Aplicação Do Modelo Calibrado Em Um Caso De Scale-Up Em Um Tambor Rotatório

Santos¹,

Barrozo²,

Duarte³

et al. 2015

Anais Do XXXVII Congresso Brasileiro De Sistemas Particulados

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RESUMOTambores rotatórios podem apresentar diferentes regimes de escoamento de partículas em seu interior, os quais estão diretamente relacionados às taxas de transferência de massa e energia e, consequentemente, à eficiência do processo em questão. Desta forma, foi realizada no presente trabalho uma investigação, tanto experimental quanto de simulação numérica, a respeito do escoamento granular no interior de um tambor rotatório sob diferentes condições operacionais. Para analisar o efeito da forma da partícula sobre o padrão de escoamento, foram utilizados grãos de arroz como material particulado. O Método dos Elementos Discretos (DEM) foi empregado em todas as simulações juntamente com a Técnica de Agrupamento (Clumping Technique), a qual permite a construção de partículas contendo formas arbitrárias. Para a calibração dos principais parâmetros presentes na modelagem DEM, um planejamento de experimentos foi utilizado. Perfis de velocidade de sólidos foram determinados experimentalmente, por meio de uma camera de alta velocidade, a fim de se validar o modelo em um caso de aumento de escala (scale up). Investigou-se, também, o efeito do comprimento do tambor sobre o padrão de escoamento granular. A calibração dos parâmetros da modelagem DEM através de um tambor em escala reduzida mostrou-se adequada para o emprego na previsão do escoamento em tambores rotatórios em uma escala superior, podendo, futuramente, ser empregada em uma escala industrial.

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“…The microscale properties themselves are influenced by fundamental material properties, both of the solid and the liquid. Detailed experimentation was performed in order to verify the link between the fundamental properties and operating variables on the one hand and the end Ramachandran et al (2008). granule properties on the other hand (Ramachandran et al, 2008). This was carried out by performing batch granulation experiments for a calcite/polyvinyl alcohol in water (calcite/PVOH-H 2 O) recipe.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation studies on a multi-dimensional and multi-scale population balance model of batch granulation

Poon

Ramachandran

Sanders

et al. 2009

Chemical Engineering Science

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Experimental studies on distributions of granule size, binder content and porosity in batch drum granulation: Inferences on process modelling requirements and process sensitivities

Cited by 74 publications

References 35 publications

Spectrophotometric analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite

Spectrophotometric analysis of disintegration mechanisms (abrasion and crushing) of agglomerates during the disc granulation of dolomite

Calibração Da Metodologia Numérica Dem E Aplicação Do Modelo Calibrado Em Um Caso De Scale-Up Em Um Tambor Rotatório

Experimental validation studies on a multi-dimensional and multi-scale population balance model of batch granulation

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