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Metals
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Advances in Slag Metallurgy—Second Edition
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Advances in Slag Metallurgy—Second Edition

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Extractive Metallurgy".

Deadline for manuscript submissions: 15 May 2024 | Viewed by 1662

Special Issue Editors

Prof. Dr. Chengjun Liu

E-Mail Website
Guest Editor
1. Key Laboratory of Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China
2. School of Metallurgy, Northeastern University, Shenyang 110819, China
Interests: high-quality steel smelting; inclusion engineering; metallurgical resource recycling; physical chemistry of metallurgical slag; interface reaction and phenomenon
Special Issues, Collections and Topics in MDPI journals
Dr. Jiyu Qiu

E-Mail Website
Guest Editor
School of Metallurgy, Northeastern University, Shenyang 110819, China
Interests: metallurgical thermodynamics; slag; CALPHAD; inclusions

Special Issue Information

Dear Colleagues,

Pyrometallurgical processes usually involve complex physical and chemical reactions between slag and molten metal. In the above process, both the properties of slag itself and the interfacial properties between slag and other phases are significant not only for the optimization of smelting process, but also for the improvement of metal product quality. In order to better understand the various properties of slag and realize a more efficient slag metallurgy, we invite you to submit your paper to this Special Issue. Research may address but is not limited to the areas below:

  1. Thermodynamic properties and phenomena of slag (such as phase equilibrium, activity, thermodynamic database, etc.);
  2. Microstructure and macro properties of slag (such as melt structure, viscosity, conductivity, surface tension, solidification and crystallization properties, etc.);
  3. Interface phenomena and reaction behavior between slag and inclusions (such as inclusion modification, inclusion dissolution and absorption, etc.);
  4. Interface phenomena and reaction behavior between slag and liquid metal (such as interfacial tension, slag–metal reaction, etc.);
  5. Design of metallurgical slag systems (refining slag, tundish slag, mold flux, etc.);
  6. Recycling of metallurgical waste slag (BF slag, BOF slag, copper slag, etc.).

Prof. Dr. Chengjun Liu 
Dr. Jiyu Qiu
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. Metals 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 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

  • slag
  • thermodynamics
  • physicochemical properties
  • interface phenomenon
  • interface reaction
  • refining slag
  • tundish slag
  • mold flux
  • comprehensive utilization

Published Papers (2 papers)

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Research

13 pages, 3544 KiB  
Article
Electrochemical Behavior of Niobium Oxide and Titanium Oxide in NaF–Na3AlF6 Molten Salt
by Bo Zhang, Shuiqing Yu, Yudong Liang and Maofa Jiang
Metals 2024, 14(3), 297; https://doi.org/10.3390/met14030297 - 01 Mar 2024
Viewed by 760
Abstract
The Bayan Obo ore deposit is a world-renowned polymetallic coexistence mine that integrates important elements, such as rare earths, iron, niobium, and titanium. The chemical properties of niobium and titanium are similar, and the two often coexist in the Bayan Obo deposit as [...] Read more.
The Bayan Obo ore deposit is a world-renowned polymetallic coexistence mine that integrates important elements, such as rare earths, iron, niobium, and titanium. The chemical properties of niobium and titanium are similar, and the two often coexist in the Bayan Obo deposit as isomorphs, making them difficult to separate. Therefore, the separation of niobium and titanium is crucial for the efficient utilization of niobium resources in the Bayan Obo ore deposit of China. To discuss the feasibility of separating niobium and titanium by selective electrolysis, cyclic voltammetry and square wave voltammetry were used to study the reduction mechanism of niobium oxide and titanium oxide in NaF–Na3AlF6 molten salt. The results revealed significant differences in the diffusion coefficients and reduction steps of Nb5+ and Ti4+ during reduction at a molybdenum cathode. At 950 °C, the diffusion coefficient of Nb5+ during reduction at a molybdenum cathode was 3.57 × 10–6 cm2/s. Also, in the NaF–Na3AlF6 system, Nb5+ underwent a three-step reduction as follows: Nb(V)→Nb(IV)→Nb(I)→Nb. The diffusion coefficient of Ti4+ during reduction at the molybdenum cathode was 9.92 × 10–7 cm2/s, and Ti4+ underwent a two-step reduction in the NaF–Na3AlF6 system: Ti(IV)→Ti(I)→Ti. When Nb2O5 and TiO2 were both present in the NaF–Na3AlF6 system, the deposition potential of niobium metal (−0.64 V) differed from that of titanium metal (−0.77 V). These differences in diffusion coefficient, reduction step, and deposition potential enabled selective electrolytic separation of niobium and titanium. Full article
(This article belongs to the Special Issue Advances in Slag Metallurgy—Second Edition)
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12 pages, 3713 KiB  
Article
The Effect of Substituting FeO with CaO on the Rheological and Surface Properties of Silicate Melts
by Rui Zhang, Yi Min, Chengjun Liu, Ting-An Zhang and Zhihe Dou
Metals 2023, 13(11), 1869; https://doi.org/10.3390/met13111869 - 09 Nov 2023
Viewed by 674
Abstract
A comprehensive understanding of the structural impact of composition is crucial in designing converter slag to optimize its rheological and surface properties during the smelting process. In this study, glassy CaO-SiO2-FexO samples with varying CaO/FexO ratios were [...] Read more.
A comprehensive understanding of the structural impact of composition is crucial in designing converter slag to optimize its rheological and surface properties during the smelting process. In this study, glassy CaO-SiO2-FexO samples with varying CaO/FexO ratios were prepared to simulate the slag in the initial stage of converter melting. The viscosity and surface tension of the slag at 1300–1600 °C were measured, and the microscopic essence of physical properties was further analyzed using Raman spectroscopy technology. The findings reveal that as CaO replaces FeO, [SiO4]-tetrahedra gradually depolymerize from Q4(Si) to Q0(Si), while [FeO6]-octahedra gradually transform into [FeO4]-tetrahedra, resulting in a decrease in the degree of polymerization of the slag. The slag with a lower degree of polymerization exhibits reduced activation energy of viscous flow and increased surface tension. Therefore, it is of great significance to appropriately control the CaO/FexO ratio in the early stage of smelting to improve the rheological and surface properties of the slag. Full article
(This article belongs to the Special Issue Advances in Slag Metallurgy—Second Edition)
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