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Topical Advisory Panel Members' Collection Series: Waste Reuse, Recycling, and Recovery—2nd Edition

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Environmental Sciences".

Deadline for manuscript submissions: 1 May 2025 | Viewed by 265

Special Issue Editor

Special Issue Information

Dear Colleagues,

Metallurgical, cement and construction, and chemical industries are the most impacting human activities in terms of solid, liquid, and gaseous emissions. Metal production involves the extraction of metals ores processed using hydro-, pyro-, or hybrid-metallurgical processes, and it is always associated with the generation of significant amounts of wastes. The cement and construction industry excavates large amounts of natural stony materials and utilizes organic and inorganic binders for the manufacturing of concrete and road layers. The chemical industry employs several kinds of reagents for the production of fertilizers, soaps, disinfectant, and pharmaceuticals. These processes are generally associated with harmful solid, liquid, and gaseous wastes that require stabilization before their final disposal. Generally, the waste and by-products of the aforementioned industries still contains valuable elements or compounds (i.e., critical metals, advanced ceramics, chemical reagents, and so on) that can be suitably and profitably recovered and used for other purposes, even outside of the root processes which have been generated. Thus, this Special Issue of Applied Sciences focuses on the possibility of recycling, recovering, and reutilizing metals, oxides, salts, or other compounds from industrial wastes. The purpose of this Issue is to collect novel and promising processes which are able to valorize wastes and create new products, pursuing the circular economy and zero-waste filosofy. Preferable papers will be those explaining feasible processes at the laboratory scale, pilot plants, or existing processes, with special regards to the economic aspects of compound extractions and the environmental impact of process residues.

Dr. Davide Mombelli
Guest Editor

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Keywords

  • circular economy
  • extractive metallurgy
  • metallurgical residues recovery
  • secondary raw materials
  • waste management
  • slag
  • dusts
  • sludges
  • skims
  • dross
  • cement and concrete
  • asphalt
  • exhaust salts

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Published Papers (1 paper)

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Research

20 pages, 3285 KiB  
Communication
The Use of Copper Slag in the Thermolysis Process for Solar Hydrogen Production—A Novel Alternative for the Circular Economy
by Manuel Fuentes, Susana Leiva-Guajardo, Atul Sagade, Felipe Sepúlveda, Alvaro Soliz, Norman Toro, José Ángel Cobos Murcia, V. E. Reyes Cruz, Mario Toledo, Edward Fuentealba and Felipe M. Galleguillos Madrid
Appl. Sci. 2025, 15(9), 4988; https://doi.org/10.3390/app15094988 (registering DOI) - 30 Apr 2025
Abstract
Copper slag, produced in pyrometallurgical processes, has the potential to generate hydrogen through thermolysis, depending on its composition. This manuscript explores the use of copper slag as a highly abundant and low-cost material for thermochemical water splitting using concentrated solar power. Copper slag [...] Read more.
Copper slag, produced in pyrometallurgical processes, has the potential to generate hydrogen through thermolysis, depending on its composition. This manuscript explores the use of copper slag as a highly abundant and low-cost material for thermochemical water splitting using concentrated solar power. Copper slag can undergo endothermic reactions with water vapor at high temperatures, conditions which are favorable for activating hydrogen evolution reactions which can be a potential resource for metal recovery such as magnetite and hematite in the circular economy. While research on copper slag and its components has primarily focused on the recovery of valuable metals and material reuse, its direct application in hydrogen production remains largely unexplored, partly due to historically low interest in hydrogen as an energy source. The vast deposits of copper slag in the Atacama Desert, combined with the growing demand for renewable energy, present a unique opportunity to develop sustainable and cost-effective hydrogen production technologies. Full article
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