Description of agglomerate growth

Schaafsma, S.H.; Vonk, P; Segers, Pythia; Kossen, N. W. F.

doi:10.1016/s0032-5910(97)03399-8

Cited by 82 publications

(31 citation statements)

References 7 publications

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“…Such a delivery of liquid to bulk material promotes, in the presented range of parameters and in case of a given material, the formation of granulation nuclei which produce 6 -8 mm agglomerates (larger than the size of delivered droplets). This trend is consistent with the results of other studies (Schaafsma et al, 1998;Waldie, 1991). Observations of droplet wetting phenomenon both during granulation and preliminary analysis ruled out the possibility that droplets broke into smaller pieces while falling from the height of a mounted nozzle tip and resulting in formation of nuclei of smaller diameters.…”

Section: Resultssupporting

confidence: 92%

“…Viscous binders, despite being difficult to distribute, may modify the mechanisms of nucleation (Hoornaert et al, 1998), which in many cases improves process conditions. Schaafsma (1998) demonstrated the association between nuclei formation with the degree of bed saturation and wetting time. A similar description of nucleation mechanism was suggested by Butensky and Hyman (1971).…”

Section: Introductionmentioning

confidence: 95%

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The Effect of Disaccharide Concentration in a Liquid Binder on The Mechanisms and Kinetics of Disc Granulation

Obraniak

Gluba

2017

Chemical and Process Engineering

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Analysis of granulation kinetics was carried out using a laboratory disc granulator with a diameter D of 0.5 m. A liquid binder was delivered to the tumbling bed at a constant flow rate with a nozzle generating droplets with a size of approx. 4-5 mm. Fine-grained chalk was used as a model of raw material and water or disaccharide solution with concentrations of 20 -40% as a wetting liquid. Different times of droplet delivery ranging from 2 to 6 min were utilized. Granulometric composition of the bed for selected lengths of process, bed moisture and the moisture of individual size-fractions were assessed. Mass of granulated material, which was transferred from nuclei fraction to other size fractions was determined on the basis of mass balance analysis and the assessment of liquid migration between fractions. The influence of disaccharide concentration in wetting liquid on the aforementioned phenomena was also examined.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 95%

The Effect of Disaccharide Concentration in a Liquid Binder on The Mechanisms and Kinetics of Disc Granulation

Obraniak

Gluba

2017

Chemical and Process Engineering

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“…The sieve analysis results indicate that for all wetting times, the fraction with the size from 6.3 to 8 mm and neighboring fractions have a dominant contribution in the formed granulate. Reference data [32,33] prove a distinct correlation between the drop size and the distribution of nuclei size in granulators such that a single drop aims at forming a single granule in accordance with an equation:…”

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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“…Schaafsma et al (1998) and Butensky and Hyman (1971) stated that the time of liquid penetration in the material depended both on the wetting thermodynamics and kinetics, which are dependent on the liquid viscosity and effective pore dimensions in the bed powder.…”

Section: Introductionmentioning

confidence: 99%

A Model of agglomerate formation during bed wetting in the process of disc granulation

Obraniak¹,

Gluba²

2012

Chemical and Process Engineering

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This paper presents a method for quantitative assessment of the mechanisms of nucleation and granules growth by layering in the process of bed wetting during periodic disc granulation. This study included two initial, consecutive stages of a process with defined time courses. The first phase was a time period, in which only formation of new nuclei took place, while in the second stage simultaneous nucleation and growth of granules as a result of sticking raw material grains to preexisting nuclei occurred. Different kinds of binding liquid were used for bed wetting in each phase. In the first phase, an aqueous solution of dye was used, and pure distilled water in the second stage. The contribution of particular mechanisms to the formation of agglomerates at different time points within the second phase of the process was determined in this study. To do that the results of bed granulometric analysis, mass balance of size fractions and the analysis of contents of a marker (dye) delivered to the bed with the binding liquid during the first phase in agglomerates were used. To assess the concentration of the dye in different size fractions of the batch, spectrophotometric analysis was utilised. The study was performed using UV-VIS JASCO V-630 spectrophotometer equipped with an integrating sphere. The sieve analysis, spectrophotometric studies and mass balance were used to determine changes in the weight of the dye containing nuclei and of the nuclei containing no dye. The aforementioned analyses were also used to assess changes in the weight of formed granules and of raw material particles attached to nuclei during simultaneous nucleation and growth of granules.

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Description of agglomerate growth

Cited by 82 publications

References 7 publications

The Effect of Disaccharide Concentration in a Liquid Binder on The Mechanisms and Kinetics of Disc Granulation

The Effect of Disaccharide Concentration in a Liquid Binder on The Mechanisms and Kinetics of Disc Granulation

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

A Model of agglomerate formation during bed wetting in the process of disc granulation

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