A Sustainable Methodology for Recycling Electric Arc Furnace Dust
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In a race to save the planet of its rapidly depleting natural resources, the use of Secondary Raw Materials (SRMs) as replacements in several processes is currently intensively pursued. In fact, this is currently one of the European Union (EU)’s mandates. Valorization of SRMs is consistent with circular economy, where resource efficiency is maximized for the benefit of both businesses and the environment. In line with this mandate, this paper focuses on investigating process phenomena related to hydrometallurgical recycling of Electric Arc Furnace (EAF) dust. In the experimental study, selective dissolution of zinc and other metals is investigated to acquire a recyclable leach residue. Based on the experimental and theoretical investigations, zinc could be extracted from the EAF dust and a recyclable leach residue produced, having chemical composition suitable as a feed material into electric arc furnace.
KeywordsSRMs Recycling EAF dust DSC-TGA curves Alkaline roasting
This work has been financed by the Association of Finnish Steel and Metal Producers (METSEK project) and supported by “RawMatTERS Finland Infrastructure” (RAMI) by Academy of Finland and CMEco-project (Finnish Funding Agency for Innovation, 7405/31/2016). Some part of the work has been also done as part of the activities of the Johan Gadolin Process Chemistry Centre at Åbo Akademi University under the project “Thermodynamic investigation of complex inorganic material systems for improved renewable energy and metals production processes”, which is also financed by the Academy of Finland. The provider of the raw material, Ovako Imatra Oy, is also greatly acknowledged by the authors.
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