Χρήση υδρογόνου για την αναγωγική φρύξη μεταλλευμάτων

Παλαβός - Χέσπερ, Βαγγέλης; Palavos - Chesper, Vangelis

dc.contributor.author	Παλαβός - Χέσπερ, Βαγγέλης	el
dc.contributor.author	Palavos - Chesper, Vangelis	en
dc.date.accessioned	2024-02-07T08:46:16Z
dc.date.available	2024-02-07T08:46:16Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/58796
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.26492
dc.rights	Default License
dc.subject	Λατερίτης	el
dc.subject	Υδρογόνο	el
dc.subject	Αναγωγή	el
dc.subject	Φρύξη	el
dc.subject	Νικέλιο	el
dc.subject	Laterite	en
dc.subject	Hydrogen	en
dc.subject	Reduction	en
dc.subject	Roasting	en
dc.subject	Nickel	en
dc.title	Χρήση υδρογόνου για την αναγωγική φρύξη μεταλλευμάτων	el
heal.type	bachelorThesis
heal.classification	Μεταλλουργία	el
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2023-10-16
heal.abstract	This thesis studies the application of hydrogen in mining metallurgy and more specifically in iron ore, which is crucial for Europe's transition to a climate-neutral continent by 2050. In this context, the use of hydrogen as a reducing agent in metallurgy is essential to replace conventional methods using mineral coal, as the by-product of this process is water vapour. Research studies show that the production of ferronickel from laterite ore, using hydrogen, is possible either through a complex pyrometallurgical/hydrometallurgical process or through a direct pyrometallurgical process using additives. This study focuses on the evaluation of ore reduction using hydrogen as the reducing agent, at low temperatures, and the extractability of the results obtained. A Greek hematitic nickel-containing laterite from the LARCO GMMSA company from the BRYSAKIA mine was used. The material, after being properly pre-treated, was fed into a tubular furnace, without the presence of atmospheric air, into which a H2/N2 mixture is introduced. The products of this process were analyzed by XRD and by Rietveld, Mössbauer spectroscopy methods. Finally, tests were carried out to determine the chemical composition and extractability of the material in order to investigate the possibility of further hydrometallurgical treatment for the production of nickel and cobalt. A total of nine experiments were carried out to compare the effect of temperature and duration of the experiment on the final product. Based on the experimental results, it is concluded that the hematite (Fe+3) phase progressively transforms into magnetite (Fe+3/Fe+2) and wustite (Fe+2) at temperatures above 350 °C, while a secondary metallic iron phase starts to form at 450 °C. For the reduction at 500 °C the hematite phase is reduced to magnetite and wustite from the first 30 minutes, while the metallic iron phase shows rapid formation after 120 minutes.	el
heal.advisorName	Ξενίδης, Άνθιμος	el
heal.committeeMemberName	Πάνιας, Δημήτριος	el
heal.committeeMemberName	Πέππας, Αντώνιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Μηχανικών Μεταλλείων Μεταλλουργών. Τομέας Μεταλλουργίας και Τεχνολογίας Υλικών. Εργαστήριο Μεταλλουργίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	72 σ.	el
heal.fullTextAvailability	false