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Metals
Special Issues
Green Recovery of Rare Earth Elements from Secondary Resources
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Green Recovery of Rare Earth Elements from Secondary Resources

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

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 1150

Special Issue Editor

Prof. Dr. Wenning Mu

E-Mail Website
Guest Editor
School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
Interests: extraction and separation of non-ferrous metals; high-value material utilization of secondary resources; recycling of waste battery materials; photocatalysis; capacitor material preparation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Rare earth elements are an important part of modern high-tech new materials such as permanent magnet materials, polishing materials, catalytic materials, etc., and have become an important strategic resource in the world. With the large-scale use of rare earth elements, the discharge of secondary resources such as residuals and scrapped products will not only endanger the environment and human health, but also be a waste of resources. At present, the recovery of rare earth elements from secondary resources is in the primary stage of research, and it is of great scientific significance to develop a green process for the recovery of rare earth elements.

This special issue will be devoted to collecting papers on the recent green processes and methods for recovering rare earth elements from different secondary resources.

Dr. Wenning Mu
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. 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

  • rare earth elements
  • hydrometallurgy
  • recovery
  • extraction
  • secondary resources
  • recycling
  • separation

Published Papers (1 paper)

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Research

17 pages, 7272 KiB  
Article
Experimental Study on the Recovery of Arsenic and Iron from Arsenic–Iron Precipitate by Carbon Thermal Magnetization Reduction
by Xuepeng Li, Dachun Liu, Juan Wang, Jun Chang and Ziyang Wang
Metals 2023, 13(2), 407; https://doi.org/10.3390/met13020407 - 16 Feb 2023
Cited by 1 | Viewed by 913
Abstract
Arsenic–iron precipitate was treated using a carbon thermal magnetization reduction method in order to recover arsenic and iron. Arsenic–iron precipitate mixed with coke powder was roasted at a low temperature; arsenic was recovered in the form of As2O3, and [...] Read more.
Arsenic–iron precipitate was treated using a carbon thermal magnetization reduction method in order to recover arsenic and iron. Arsenic–iron precipitate mixed with coke powder was roasted at a low temperature; arsenic was recovered in the form of As2O3, and iron was recovered in the form of Fe3O4. The volatilization rate of arsenic was 97.45%, and the content of arsenic in the precipitate was decreased to 0.60%. Iron and arsenic were recovered in the form of Fe3O4 and As2O3 with a purity of 99.91 wt.% under the conditions of a roasting temperature of 650 °C, coke powder addition of 25 wt.%, a roasting time of 180 min, and an argon flow rate of 10 L/min. The volatilization of arsenic was controlled by a chemical controlling step at 20–100 min, and this was switched to a diffusion controlling step at 120–180 min by kinetic experiments. The reaction mechanism of arsenic and iron under carbon thermal magnetization reduction was as follows: in the early stage of the reaction, a large amount of FeAsO4 was decomposed into As2O3 and Fe3O4; in the middle and late stages of the reaction, FeAsO4 was continuously decomposed and reduced, and the content of Fe3O4 was continuously increased until all iron was magnetized to generate Fe3O4, and the decomposed As2O3 volatilized into dust. Arsenic reacted with CaO to generate Ca3(AsO4)2, and this may be the reason why arsenic could not be removed completely. Full article
(This article belongs to the Special Issue Green Recovery of Rare Earth Elements from Secondary Resources)
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