Advances in Recycling and Reuse of Metals

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

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 860

Special Issue Editors


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Guest Editor
Department of Mechanical Engineering, Universidade do Minho, 4800-058 Guimarães, Portugal
Interests: wastes; extraction metallurgy; recycling
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Materials and Metallurguical Engineering, Faculty of Engineering, University of Porto, Porto, Portugal
Interests: wastes; extraction metallurgy; recycling

Special Issue Information

Dear Colleagues,

The economic and environmental benefits of metal recycling are substantial. The practice reduces energy consumption and greenhouse gas emissions compared to primary production methods, contributing to climate change mitigation. Additionally, metal recycling contributes to the conservation of raw materials, thus reducing the need for extensive mining. This is more relevant when metals are scarce in nature or critical to the operations of modern society.

Metal recycling technologies are developing at a significant pace, enabling more efficient extraction and refinement processes. Innovations in sorting, shredding, separation techniques and extraction metallurgy also offer to enhance the recovery of various metals from complex waste streams. Moreover, advancements in metallurgical science allow the extraction of high-purity metals from recycled materials.

This Special Issue is devoted to the presentation of innovative research works on the field of recycling, extraction of metals from wastes as well as possibilities of reuse of metallic components.

Prof. Dr. Fernando Castro
Prof. Dr. Manuel Fonseca Almeida
Guest Editors

Manuscript Submission Information

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Keywords

  • recycling
  • extraction metallurgy
  • wastes
  • sorting
  • separation
  • reuse
  • critical metals
  • secondary raw materials
  • resources

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Published Papers (1 paper)

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Research

18 pages, 14402 KiB  
Article
Steel Chips as a Raw Material for MEX
by Catarina Duarte Batista and Maria Teresa Freire Vieira
Metals 2024, 14(11), 1293; https://doi.org/10.3390/met14111293 - 15 Nov 2024
Viewed by 550
Abstract
In recent years, metal chip powders obtained from solid-state processes have shown great potential as a sustainable raw material for powder technologies. The material and fragmentation process of the chips has a significant role in the final characteristics of the powder particles, such [...] Read more.
In recent years, metal chip powders obtained from solid-state processes have shown great potential as a sustainable raw material for powder technologies. The material and fragmentation process of the chips has a significant role in the final characteristics of the powder particles, such as size and particle size distribution, shape, surface, and structure, which are essential parameters to consider when converting chips to powder for applications. However, tool steel chips as a powder raw material have not yet been significantly studied. In this study, the steel chips were from machining AISI H13 steel and the milling process used a ball mill, and the challenge was to obtain powder particle sizes of around 20 µm with suitable properties from the application of envisaged material extrusion (MEX). A comparison study with the commercial raw material for MEX, such as powder metal filament extrusion, was performed. This study highlights the behaviors of chip powders during all steps of MEX, namely, feedstock and filament production, 3D object shaping, thermal de-binding, and sintering. A comparison of the mixture based on powder from chips and commercial powders for MEX was performed after evaluating the mixing torque of the powder and the system of binders and additives suitable for the rheological characteristics required for an extrusion mixture, and optimizing the binder removal and the sintering conditions. The 3D objects resulting from chip powders had a refined microstructure, showing an increase of 15% in the microhardness when compared with the those resulting from commercial powders. Full article
(This article belongs to the Special Issue Advances in Recycling and Reuse of Metals)
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