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Minerals
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Granulation and Heat Recovery from Metallurgical Slags
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Granulation and Heat Recovery from Metallurgical Slags

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Processing and Extractive Metallurgy".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 2516

Special Issue Editors

Dr. Sharif Jahanshahi

E-Mail Website
Guest Editor
Meta-Logical Solution Pty Ltd., Melbourne, VIC 3143, Australia
Interests: sustainable processing of resources; thermodynamics of complex melts; value recovery from byproducts
Prof. Dr. Mansoor Barati

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, University of Toronto, Toronto, ON L5L 1C6, Canada
Interests: sustainable materials; high-quality alloys; waste recycling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Slag granulation with heat recovery is an essential and emerging technology for sustainable metal production. This technology has been developing for a few decades with much technical and commercial success. Despite such good progress, there are still some challenges in optimizing the performance of the process and maximizing waste heat recovery in the form of high-grade heat.

In response to these challenges, significant R&D has taken place worldwide, where process fundamentals and engineering have been investigated through experiments, modeling, and simulation, as well as piloting. In this Special Issue of the journal of Minerals, we aim to highlight recent progress and breakthroughs through invited papers from international experts. The invited papers will cover the fundamentals of atomization/granulation of molten slags, heat transfer and granule formation, phase transformations in liquid and solid states, reactor engineering for efficient heat recovery, utilization and characteristics of granulation products, process design and implementation in pilot and industrial scales, etc.

Dr. Sharif Jahanshahi
Dr. Mansoor Barati
Guest Editors

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. Minerals is an international peer-reviewed open access monthly 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 2400 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

  • molten slag
  • granulation
  • atomization
  • heat recovery
  • slag valorization

Published Papers (2 papers)

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Research

15 pages, 4242 KiB  
Article
CFD Numerical Simulation on the Mode of Ligament Disintegration during Centrifugal Granulation of Molten Slag by Using a Spinning Cup
by Aifu Zhao, Yuhua Pan, Ming Zhao, Shili Zhang, Ping Ma and Xin Feng
Minerals 2023, 13(3), 316; https://doi.org/10.3390/min13030316 - 23 Feb 2023
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Abstract
In order to study the behavior of molten blast furnace slag ligament breakup into droplets by centrifugal granulation with a spinning cup, three-dimensional transient CFD model simulations were performed in the present work to study the process of the slag deformation into ligaments [...] Read more.
In order to study the behavior of molten blast furnace slag ligament breakup into droplets by centrifugal granulation with a spinning cup, three-dimensional transient CFD model simulations were performed in the present work to study the process of the slag deformation into ligaments upon leaving the spinning cup, which eventually disintegrate into droplets. The formation of molten slag ligaments at the edge of the spinning cup and their disintegration into droplets were numerically revealed so that the behavior and mechanism of the slag ligament breakup into droplets could be investigated. This work specifically examined the influence of cup spinning speed on the diameter and length of the molten slag ligaments around the cup periphery and the diameter of the droplets produced. The simulation results show that, for the same slag flowrate, with the increase in cup spinning speed, the slag film thickness at the cup edge decreases, the number of molten slag ligaments increases, and the diameter of the ligaments decreases, thus reducing the diameter of slag droplets. Moreover, as the number of molten slag ligaments increases as a result of the increased cup spinning speed, the flowrate of a single ligament decreases, so that the ligament disintegrates in a shorter radial distance, that is, the length of the ligament is shortened. In addition, this work also investigated the behavior and mechanism of a single molten slag ligament breakup into droplets. It was found that the process of molten slag ligament breakup into droplets under the action of centrifugal force and surface tension can also be approximately explained by the theory of the Rayleigh disintegration mechanism. Full article
(This article belongs to the Special Issue Granulation and Heat Recovery from Metallurgical Slags)
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14 pages, 2901 KiB  
Article
CFD Modeling and Cold Physical Model Simulation on Single Molten Slag Ligament Disintegration into Droplets
by Ming Zhao, Yuhua Pan, Aifu Zhao, Shili Zhang, Ping Ma and Xin Feng
Minerals 2023, 13(2), 139; https://doi.org/10.3390/min13020139 - 18 Jan 2023
Cited by 1 | Viewed by 1082
Abstract
Aiming at the mode of liquid ligament disintegration into droplets in the process of the centrifugal granulation of molten blast furnace slag using a spinning cup, in order to gain an in-depth understanding of the behavior and mechanism of droplet formation by liquid [...] Read more.
Aiming at the mode of liquid ligament disintegration into droplets in the process of the centrifugal granulation of molten blast furnace slag using a spinning cup, in order to gain an in-depth understanding of the behavior and mechanism of droplet formation by liquid ligament disintegration and to obtain appropriate conditions to control the size of the produced slag granules, a three-dimensional CFD model describing water–air two-phase flow with a free surface was established in this work for simulating the process of a single water ligament breakup into droplets under the action of gravity, surface tension and inertial forces, so as to compare with the process of a molten slag ligament disintegration into droplets due to centrifugal force exerted by the spinning cup. By studying the disintegration behavior and mechanism of a single water ligament, the similar phenomenon of a molten slag ligament disintegration is examined. The numerical simulation results on the breakup of a single water ligament show that the length of the ligament before its disintegration and the diameter of the droplets formed both increase with the increase of the velocity of the ligament initially exiting a capillary nozzle. In addition, an experimental set-up was established in the laboratory to conduct cold physical model simulation experiments on single water or liquid paraffin ligament disintegration. The experimental results are compared with the numerical simulation results so that the reliability of the CFD model is verified. The results of the present study show that, in the centrifugal granulation process of blast furnace slag using a spinning cup operated in the ligament disintegration mode, the breakup of a single molten slag ligament is very similar to that of a single water or liquid paraffin ligament, and both approximately follow the Rayleigh Disintegration Mechanism, which provides a theoretical basis for analyzing the breakup process of the ligaments of different liquids as references for guiding the operation of centrifugal granulation of molten slag. Full article
(This article belongs to the Special Issue Granulation and Heat Recovery from Metallurgical Slags)
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