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Metals
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Recovery and Extraction of Valuable Metal
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Special Issue "Recovery and Extraction of Valuable Metal"

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

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 1094

Special Issue Editor

Prof. Dr. Yang Tian

E-Mail Website
Guest Editor
National Engineering Research Center For Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, China
Interests: light metals; recycling; second resources; metallurgical process; high purity metals

Special Issue Information

Dear Colleagues,

Valuable metals are the basis of social development. From one point of view, the history of human social development is also the history of extraction and utilization of various valuable metals. In recent years, with the aggravation of global warming, metal resources becoming increasingly exhausted and changes in environmental protection policies, the traditional metallurgical methods and production concepts have also changed. How to reduce environmental pollution and improve the utilization of limited resources has become a key issue. On the one hand, with the reduction in rich ores and the increase in lean ores, more efficient extraction of valuable metals from lean ores can alleviate the pressure on resources and environment. On the other hand, with the extensive use of metal resources, the recovery of secondary resources is also important for the sustainable development metallurgy.

This Special Issue of Metals will focus on the latest research on the separation, extraction and purification of valuable metals from primary resources and secondary resources, the comprehensive utilization of secondary resources or metallurgical waste and new low-cost methods with high implementation potential and high efficiency.

Prof. Dr. Yang Tian
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 2000 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

  • metallurgy
  • recovery
  • secondary resources
  • separation
  • extraction
  • valuable metals
  • purify
  • efficient utilization
  • vacuum
  • conservation of natural resources

Published Papers (2 papers)

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Research

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Article
Magnesium Alloy Scrap Vacuum Gasification—Directional Condensation to Purify Magnesium
by
Rui Li
,
Lipeng Wang
,
Bin Yang
,
Baoqiang Xu
,
Dong Liang
,
Fei Wang
and
Yang Tian
Metals 2023, 13(4), 675; https://doi.org/10.3390/met13040675 - 29 Mar 2023
Viewed by 481
Abstract
Magnesium alloys, known as a “21st-century green engineering material”, are widely used in many fields, including during the production and consumption of magnesium alloys die-casting products such as AZ91D, AM50, and AM60B. In addition, a large amount of waste is generated, which not [...] Read more.
Magnesium alloys, known as a “21st-century green engineering material”, are widely used in many fields, including during the production and consumption of magnesium alloys die-casting products such as AZ91D, AM50, and AM60B. In addition, a large amount of waste is generated, which not only pollutes the environment but also wastes secondary resources. Hereby, we reported the vacuum gasification—directional condensation method, calculated the vapor pressure separation coefficient parameters, and drew the gas-liquid phase equilibrium diagram depending on the distillation temperature, condensation temperature, and system pressure for the magnesium volatilization process. The results showed that under the following conditions (distillation temperature: 1073 K, system pressure: 100 Pa, condensation temperature: 873 K, and condensation duration: 30 min), the magnesium volatilization yield could approach 93.76%, and the purity of magnesium could reach 99.98%. This research is a good theoretical and practical basis for the recovery of magnesium alloy waste using the vacuum gasification method. Full article
(This article belongs to the Special Issue Recovery and Extraction of Valuable Metal)
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Article
Kinetics and Mechanisms of Artificial Willemite Leaching in Low-Sulfuric-Acid Solution at Elevated Temperature
by
Hongsheng Xu
,
Yanan Qian
,
Quanfa Zhou
,
Chang Wei
,
Qi Wang
,
Wenjie Zhao
,
Binglong Zhu
,
Juan Wu
,
Fang Ren
and
Jingxu Xu
Metals 2022, 12(12), 2031; https://doi.org/10.3390/met12122031 - 26 Nov 2022
Viewed by 417
Abstract
The present study was undertaken to investigate the effects of temperature, sulfuric acid concentration, agitation speed, and particle size on the high-temperature leaching kinetics of artificial willemite in low sulfuric acid solution. A mathematical model taking into account the change in acid concentration [...] Read more.
The present study was undertaken to investigate the effects of temperature, sulfuric acid concentration, agitation speed, and particle size on the high-temperature leaching kinetics of artificial willemite in low sulfuric acid solution. A mathematical model taking into account the change in acid concentration was evaluated for the leaching rate increased with increasing sulfuric acid concentration, temperature, and agitation speed and decreasing particle size. The kinetic analysis indicated that the leaching process was well interpreted by a modified grain model with product layer diffusion as the main rate-controlling step, and the shrinking core model was used to represent the reaction of each grain. The characteristic changes of the sample before and after leaching were studied using a scanning electron microscope/energy dispersive X-ray spectrometer (SEM/EDS) and X-ray diffraction (XRD) to elucidate the leaching mechanism. The apparent activation energy was found to be 22.06 kJ/mol at 373–413 K, and the reaction order with sulfuric acid concentration was 1.6472. On the basis of the grain model, the following rate equation was established: 1.07ln(1−0.93x)−[1.28ln0.17+(1−x)23−0.42(1−x)130.17+(1−x)23+0.84(1−x)13+4.5arctan(2.76(1−x)13−0.58)]+3.8=43.55e−22060RTt. Full article
(This article belongs to the Special Issue Recovery and Extraction of Valuable Metal)
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