Investigation of the layering mechanism of agglomerate growth during drum pelletization

Sastry, K.V.S.; Dontula, Prasannarao; Hoşten, Çetin

doi:10.1016/s0032-5910(02)00271-1

Cited by 30 publications

(15 citation statements)

References 3 publications

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“…During the granulation process, the added water served as a binding liquid to form water bridges between granules. With the water addition increasing, the states of liquid bridge formation change from the pendular to funicular and then to the capillary state, 30) accompanying layering of fines adhering onto nuclei granules, granule nucleation and coalescence due to capillary force induced from the liquid bridges, 5,18,31,32) which leads to the granule growth to produce larger granules. The presence of water is essential for generating the capillary force and governing granule growth mechanisms, which is well explained that moisture has the greatest influence on granule size.…”

Section: Anova Analysismentioning

confidence: 99%

Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography

Zhou

et al. 2020

ISIJ Int.

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Granulation and packing of iron ores are highly essential for having a strong function with packed bed porosity distribution, and further affecting the subsequent sintering process. In this study, high-resolution X-ray computed tomography technique was applied to investigate the influence of moisture, hydrated lime and concentrate levels on granule properties and porosity distribution of packed bed based on the Taguchi orthogonal array tests, and the optimum granulation factors combination was determined by the defined porosity segregation degree for improving packed bed homogeneity. Moisture was found to be the dominant factor affecting granule size with a major percent contribution of 94.42%. Bulk bed porosity was significantly affected by all three selected factors of moisture, hydrated lime and concentrate levels. The percent contribution order was shown as hydrated lime (55.10%) > moisture (29.12%) > concentrate (14.36%). The whole packed bed was found to exhibit significant inhomogeneity. Axial porosity increases from the bottom upwards along the packed bed height, and radial porosity appears a symmetric parabolic distribution where porosity achieves the minimum of 0.3 at bed center and increases sharply near the wall. To achieve the homogeneous packed bed of iron ore granules, the optimum granulation factors combination for decreasing axial and radial porosity segregation are determined as 6.8% moisture, 4% hydrated lime, 0% concentrate and 5.8% moisture, 4% hydrated lime, 0% concentrate, respectively. The results provide the theoretical guidance for granulation and packing in iron ore sintering to improve sintering yield and quality.

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Section: Anova Analysismentioning

confidence: 99%

Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography

Zhou

et al. 2020

ISIJ Int.

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“…Wet granulation or agglomeration of fine solid particles into larger particles, called granules or agglomerates, is a widespread technique in industrial processes such as the manufacture of pharmaceuticals [1,2], fertilizers and food products [3,4], powder metallurgy [5] and iron-making [6][7][8]. The increased size of the granules modifies the rheological properties of the granular material and may improve flow properties, reduce the segregation of different types of primary particles or enhance the permeability for the interstitial gas between grains [4,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Agglomeration of wet particles in dense granular flows

Nezamabadi

Mutabaruka

et al. 2019

Eur. Phys. J. E

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In order to get insight into the wet agglomeration process, we numerically investigate the growth of a single granule inside a dense flow of an initially homogeneous distribution of wet and dry particles. The simulations are performed by means of the discrete element method and the binding liquid is assumed to be transported by the wet particles, which interact via capillary and viscous force laws. The granule size is found to be an exponential function of time, reflecting the conservation of the amount of liquid and the decrease of the number of available wet particles inside the flow during agglomeration. We analyze this behavior in terms of the accretion and erosion rates of wet particles for a range of different values of material parameters such as mean particle size, size polydispersity, friction coefficient and liquid viscosity. In particular, we propose a phase diagram of the granule growth as a function of the mean primary particle diameter and particle size span, which separates the parametric domain in which the granule grows from the domain in which the granule does not survive.

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“…6 Pelletisation is the operation of agglomerating moist particulate materials by tumbling them in horizontal rotating drums or inclined discs. 7,8 The grate kiln process is an advanced and mature process to produce oxidised pellets in the iron and steel industry and comprises pelletising, drying, preheating, roasting and cooling. Many pelletising plants use this technology to produce oxidised pellets, 9,10 such as the Luossavaara-Kiirunavaara AB pelletising plant in Sweden and the Wuhan Iron and Steel Corporation pelletising plant in China.…”

Section: Introductionmentioning

confidence: 99%

Preparation of oxidised pellets using pyrite cinders as raw material

Zhu

Chun

Pan

et al. 2013

Ironmaking & Steelmaking

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Pyrite cinders are a solid waste generated by the sulphuric acid industry and are considered environmentally hazardous. In order to try and recycle this material as a source of Fe units, the effects of different ratios of pyrite cinders to magnetite concentrate on the qualities of green and roasted pellets were evaluated. The results show that sulphur mainly exists as elementary sulphur in pyrite cinders and was nearly removed at the preheating stage. The higher the pyrite cinder content, the greater the porosity of the roasted pellets, leading to low compressive strength of the roasted pellets. Roasted pellets with acceptable quality for industrial use were obtained under the conditions of 40% pyrite cinders and 60% magnetite concentrate, preheating at 1000uC for 15 min and roasting at 1300uC for 15 min.

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Investigation of the layering mechanism of agglomerate growth during drum pelletization

Cited by 30 publications

References 3 publications

Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography

Taguchi Orthogonal Test on Granule Properties and Porosity Distribution in Sintering Bed using High-resolution X-ray Computed Tomography

Agglomeration of wet particles in dense granular flows

Preparation of oxidised pellets using pyrite cinders as raw material

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