Recycling of aluminum scrap through direct Hot Rolling Process
type: CreativeWork
description: Aluminum, with its unique blend of properties, has risen to become one the most abundant structural metal. In terms of industrial-scale production, it ranks second only to iron and steel. Aluminum can be produced from raw materials, referred to as primary aluminum, or by recycling scraps (secondary aluminum). Recycling offers a more sustainable solution, minimizing the environmental footprint that comes with primary production. The term "Solid State Recycling (SSR)" denotes a group of recycling processes that eliminate the need for melting. When comparing recycling efficiency, energy use, cost, and environmental consequences, SSR stands out as a more fitting choice. It can transform scrap, particularly chips, directly into bulk and semi-finished products with enhanced mechanical properties, avoiding the remelting phase. While various SSR methods exist, a process solely reliant on rolling is missing. To grasp the industrial importance of metal rolling in the industry, consider this: approximately 90% of steel, aluminum, and copper alloys are subjected to a rolling process at least once during their manufacturing. That’s why a solid-state recycling process based on rolling could be crucial in the industrial field. Particularly important would be the development of a process that can be directly applied into existing industrial rolling plant, with little or no alterations. The purpose of this dissertation is to discuss and develop a process with this very purpose in mind. The newly developed process was applied to the major family of wrought aluminum alloy: AA1xxx (Pure Al), AA5xxx (Al-Mg), AA6xxx (Al-Mg-Si) and AA3xxx (Al-Mn). The samples were studied in terms of mechanical properties, microstructure, and corrosion properties. In the last part of this dissertation, LCA analysis will be applied to study the environmental impact of the recycling technique compared to traditional routes based on melting. The thesis highlights several key findings regarding the solid-stat…
abstract: Aluminum, with its unique blend of properties, has risen to become one the most abundant structural metal. In terms of industrial-scale production, it ranks second only to iron and steel. Aluminum can be produced from raw materials, referred to as primary aluminum, or by recycling scraps (secondary aluminum). Recycling offers a more sustainable solution, minimizing the environmental footprint that comes with primary production. The term "Solid State Recycling (SSR)" denotes a group of recycling processes that eliminate the need for melting. When comparing recycling efficiency, energy use, cost, and environmental consequences, SSR stands out as a more fitting choice. It can transform scrap, particularly chips, directly into bulk and semi-finished products with enhanced mechanical properties, avoiding the remelting phase. While various SSR methods exist, a process solely reliant on rolling is missing. To grasp the industrial importance of metal rolling in the industry, consider this: approximately 90% of steel, aluminum, and copper alloys are subjected to a rolling process at least once during their manufacturing. That’s why a solid-state recycling process based on rolling could be crucial in the industrial field. Particularly important would be the development of a process that can be directly applied into existing industrial rolling plant, with little or no alterations. The purpose of this dissertation is to discuss and develop a process with this very purpose in mind. The newly developed process was applied to the major family of wrought aluminum alloy: AA1xxx (Pure Al), AA5xxx (Al-Mg), AA6xxx (Al-Mg-Si) and AA3xxx (Al-Mn). The samples were studied in terms of mechanical properties, microstructure, and corrosion properties. In the last part of this dissertation, LCA analysis will be applied to study the environmental impact of the recycling technique compared to traditional routes based on melting. The thesis highlights several key findings regarding the solid-stat…
author: CARTA, MAURO
language: eng
keywords: Settore ING-IND/16 - Tecnologie e Sistemi di Lavorazione
date published: 2024-02-09T00:00:00+01:00
date modified: 2026-07-24T01:29:52Z
provider: Università di Cagliari
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Università degli Studi di Cagliari

PropertyValue
property ID: Handle
value: https://hdl.handle.net/11584/390305