The Analysis of the Morphology of the Saddle-Shaped Bronze Chips Briquettes Produced in the Roller Press

Bembenek, Michał; Krawczyk, J.; Frocisz, Łukasz; Śleboda, Tomasz

doi:10.3390/ma14061455

Cited by 5 publications

(7 citation statements)

References 41 publications

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“…The average stress values are 36÷40 MPa, where the minimum value is determined for the circumferential speed of the rollers of 0.2 m/s ( Figure 12 ). These results align with the experiments presented in [ 53 , 54 ], which demonstrated higher pressures and greater density of saddle-shaped briquettes in their upper part.…”

Section: Research Results and Analysissupporting

confidence: 92%

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Modelling of the Fine-Grained Materials Briquetting Process in a Roller Press with the Discrete Element Method

2022

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By using the Altair® EDEM™ software, which implements the discrete element method, modelling and further study of the processes occurring in the roller press’s deformation area were carried out. It was shown that the discrete element method makes it possible to accurately describe the phenomena occurring in the area of roller press deformation compared with the finite element method. Models of material compaction in a roller press are developed using calcium hydroxide (slaked lime) and copper ore concentrate. The developed model makes it possible to determine the process’s energy parameters and the material’s compaction characteristics, taking into account the characteristics of its constituent particles. It was shown that discrete element modelling could be used effectively to create roller presses that provide rational characteristics of the briquetting process, taking into account the properties of the material being briquetted and the operating modes of the equipment. The results of the studies provided the basis for the applicability of the development of the discrete element method for describing the phenomena occurring in roller presses and accelerating the design of press equipment and briquetting technological processes.

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Section: Research Results and Analysissupporting

confidence: 92%

“… A general correlation between pressure distribution, porosity, and temperature distribution: ( a ) pressure distribution—DEM; ( b ) map of the porosity distribution on the copper briquette cross-section [ 53 ]; ( c ) the thermographic image of the briquette after briquetting [ 54 ]. …”

Section: Figurementioning

confidence: 99%

Modelling of the Fine-Grained Materials Briquetting Process in a Roller Press with the Discrete Element Method

2022

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“…From the analysis of both distributions, it can be concluded that higher local briquette temperatures in a given place correspond to better local density. Therefore, in the case of saddle-shaped briquette in the upper part of the briquette, the stresses and strain are greater, and those in the lower part-smaller, which is also confirmed by the recent research presented in the paper [76].…”

Section: Discussionsupporting

confidence: 80%

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

Bembenek

Uhryński

2021

Materials

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The unit pressure in the fine-grained material consolidation process in the roller press can reach over hundred MPa and is a parameter which results, among other things, from the properties of the consolidated material and the compaction unit geometry. Its value changes depending on the place on the molding surface. Generating different pressure on the surface of briquettes makes their compaction different. One’s own and other researchers’ experience shows that, in the case of exerting high pressure on the merged fine-grained material, the higher unit pressure exerted on the material, the higher temperature of the consolidated material is. The temperature distribution on the surface of the briquettes can testify the locally exerted pressure on the briquette. The stress distribution in the briquetting material is still a subject of research. The article includes thermography studies of the briquetting process of four material mixtures. Thermal images of briquettes were taken immediately after they left the compaction zone as well as forming rollers. The obtained thermograms and temperature variability at characteristic points of the surface of briquettes were analyzed. The correlation between the temperature distribution and the stress distribution in the briquettes was determined.

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“…The highest temperature is obtained in the upper middle part of the briquette. In this part of the briquette from the front side, one can therefore expect the greatest packing of the material, resulting from the greatest compacting pressure acting at this point [46]. These results coincide with the simulation tests carried out for briquetting of fine-grained materials using the discrete element method [50].…”

Section: Temperature Distribution On Briquette Surfacessupporting

confidence: 78%

“…During the production of a briquette in a roller briquetting press, the pressure exerted on its external surface is not uniform [44]. Depending on the place on the surface, it may have a variable value [45,46]. The resulting compacting pressure distribution depends not only on the material properties but also on the geometry of the compaction unit and the briquette volume.…”

Section: Introductionmentioning

confidence: 99%

The Use of Thermography to Determine the Compaction of a Saddle-Shaped Briquette Produced in an Innovative Roller Press Compaction Unit

Bembenek

Uhryński

2022

Acta Mechanica Et Automatica

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The unit compacting pressure in the fine-grained material consolidation process in the roller press can reach >100 MPa and is a parameter that results, among other things, from the properties of the consolidated material and the compaction unit geometry. Achieving the right pressure during briquetting is one of the factors that guarantee the proper consolidation and quality of briquettes. The distribution of the temperature on the surface of the briquettes correlates with locally exerted pressure. The present work aimed to analyse the briquetting process of four fine-grained materials in a roller press equipped with saddle-shaped briquette-forming rollers based on images obtained from the thermography conducted immediately after their consolidation. The tests were carried out in a roller press that was equipped with forming rollers of 450-mm diameter and having a cavity with a volume of 4 cm3, as described by patent PL 222229 B1. Two mixtures of hydrated lime with 9.1 wt% and 13.0 wt% water, a mixture of scale and a mixture of electric arc furnace (EAF) dust were used for the tests. In most mixtures, the highest temperatures were achieved in the middle-upper part of the briquettes. The briquettes from the EAF dust mixture heated locally the most on the surface up to 37.7 °C. The difference between the maximum briquette temperature and the ambient temperature was 20.2 °C.

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The Analysis of the Morphology of the Saddle-Shaped Bronze Chips Briquettes Produced in the Roller Press

Cited by 5 publications

References 41 publications

Modelling of the Fine-Grained Materials Briquetting Process in a Roller Press with the Discrete Element Method

Modelling of the Fine-Grained Materials Briquetting Process in a Roller Press with the Discrete Element Method

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

The Use of Thermography to Determine the Compaction of a Saddle-Shaped Briquette Produced in an Innovative Roller Press Compaction Unit

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