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Mechanical Processing of Granular and Fibrous Materials (Second Edition)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 511

Special Issue Editor


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Guest Editor
Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, A. Mickiewicza 30, 30-059 Krakow, Poland
Interests: mechanical engineering; agglomeration; technological devices; surface engineering; circular economy; solid fuels; CNC machining; 3D printing
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Special Issue Information

Dear Colleagues,

Not all of us are aware that in order to manufacture a face powder, a mineral such as talc or chalk must be crushed and milled to a specified grain size, so that it can be properly applied to the face, and then agglomerated for further product packaging, safe transportation and ease of dosing for end users.

Additionally, extracted copper ore, which contains only a few percent of pure copper, requires firstly grinding, then mechanical enrichment and lastly briquetting before the process of smelting copper matte. Such examples, although small and narrow, illustrate well that the mechanical processing of granular and fibrous materials, although usually invisible, played a key role in the technological advancement of human civilization. The multitude of materials of this type means that they cannot be easily unified. The granular and fibrous materials can be of various origins, e.g. agricultural, from forest and mining industries, chemical processing, waste management or even the food industry.

Depending on the material application, for example, as a ballast for railway tracks, bread flour, medicine pills etc., for both powder and granules, it is important to achieve proper shape and size.

It is certain that each of these materials in terms of preparation and further use require the selection of an appropriate mechanical processing technology and development of favorable process conditions.

This Special Issue is intended to share our experience with the mechanical processing of granular and fibrous materials from the side of both processes and machines.

I encourage you to publish scientific papers in the field of mechanical processing technologies, machines and devices, as well as new inventions and challenges, in particular regarding crushing, agglomeration, enrichment and waste management.

Prof. Dr. Michał Bembenek
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • agglomeration
  • grinding
  • milling
  • screening
  • flotation
  • materials mechanical processing
  • materials transport
  • materials storage

Published Papers (1 paper)

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Research

20 pages, 2292 KiB  
Article
Modeling of the Efficiency of the Centrifugal Conical Disk Dispenser of Bulk Materials
by Vasyl Dmytriv, Michał Bembenek, Vasyl Banha, Ihor Dmytriv, Damian Dzienniak and Saltanat Nurkusheva
Materials 2024, 17(8), 1815; https://doi.org/10.3390/ma17081815 - 15 Apr 2024
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Abstract
Centrifugal disk dispensers are widely used in various tasks of dosing bulk, dispersed materials. The design of the disk depends on the physical and mechanical characteristics of the dosing medium. The work discusses the development of an analytical model of the movement of [...] Read more.
Centrifugal disk dispensers are widely used in various tasks of dosing bulk, dispersed materials. The design of the disk depends on the physical and mechanical characteristics of the dosing medium. The work discusses the development of an analytical model of the movement of a material particle along a conical centrifugal disk depending on the kinematic characteristics of the dosing process and the characteristics of the dosing material, as well as experimental confirmation of the theoretical model, which is relevant for the calculation and design of working elements of this type. The obtained system of differential equations is solved using the Runge–Kutta numerical method. Experimental studies were carried out using the method of a planned factorial experiment. The experiment was conducted for three factors at three levels. The feedback criterion was the performance of a centrifugal conical disk dispenser for bulk materials. The disk cone angle was set at 10, 20, and 30°. The disk diameter was 130, 150, and 170 mm, the gap between the disk and the edge of the hopper neck was 6, 8, and 10 mm, and the rotational speed of the conical disk was 0.65, 1.02, and 1.39 rad/s. The dispensing rate of the dispenser ranged from 15 to 770 g/s, depending on the values of the experimental factors. For use in the regression equation of the natural values of the factors, a method of transforming the terms of the equation from coded values to natural ones is provided. The obtained experimental correlation dependencies were checked for reproducibility with Cochrane’s test, and the adequacy of the model was checked using Fisher’s test. The significance of the coefficients in the correlation equation was evaluated using the Student’s t-test. The difference between the experimental data and the results of the theoretical modeling does not exceed 5%. The obtained system of differential equations makes it possible to model the radial velocity of the ascent of bulk material from the conical rotating disk depending on the rotation frequency, disk diameter, and the height of the annular gap between the discharge throat of the hopper and the conical disk. The analytical model enables the modeling of the productivity of the conical dispenser for bulk materials for arbitrary parameters of rotation frequency, disk diameter, and the size of the annular gap between the discharge throat of the hopper and the conical disk. Full article
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