dc.contributor.author |
Παπαϊωάννου, Δημήτρης
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el |
dc.contributor.author |
Papaioannou, Dimitris
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en |
dc.date.accessioned |
2016-06-29T11:26:50Z |
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dc.date.available |
2016-06-29T11:26:50Z |
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dc.date.issued |
2016-06-29 |
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dc.identifier.uri |
https://dspace.lib.ntua.gr/xmlui/handle/123456789/42898 |
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dc.identifier.uri |
http://dx.doi.org/10.26240/heal.ntua.12480 |
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dc.rights |
Default License |
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dc.subject |
Μεταλλουργία |
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dc.subject |
Φρύξη |
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dc.subject |
Λατερίτες |
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dc.subject |
Καύσιμα |
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dc.subject |
Λιγνίτης |
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dc.subject |
Ferronickel |
en |
dc.subject |
Rotary Kilns |
en |
dc.subject |
Laterite ores |
en |
dc.subject |
Larco S.A |
en |
dc.subject |
Lignite |
en |
dc.title |
Αναγωγική φρύξη λατεριτικών μεταλλευμάτων με στερεά καύσιμα |
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heal.type |
bachelorThesis |
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heal.classification |
Μεταλλουργία |
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heal.language |
el |
|
heal.access |
free |
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heal.recordProvider |
ntua |
el |
heal.publicationDate |
2015-10-27 |
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heal.abstract |
Στην παρούσα διπλωματική εργασία εξετάστηκε η αναγωγική φρύξη τριών Ελληνικών νικελιούχων λατεριτικών μεταλλευμάτων (Ευβοίας, Αγ. Ιωάννη και Καστοριάς) με στερεά καύσιμα (λιγνίτη, γαιάνθρακα και κωκ). Πραγματοποιήθηκαν δύο κατηγορίες πειραμάτων αναγωγικής φρύξης. Κατά την πρώτη, πραγματοποιήθηκε αναγωγική φρύξη των μεταλλευμάτων ΜΕΕ, ΜΕΙ και ΜΕΚ με μίγμα στερεών καυσίμων, ενώ κατά την δεύτερη πραγματοποιήθηκε αναγωγική φρύξη μίγματος μεταλλευμάτων με μίγμα στερεών καυσίμων. Οι αναλογιών μίξης μεταλλευμάτων και καυσίμων οι οποίες χρησιμοποιήθηκαν, έχουν εφαρμοστεί στην βιομηχανία από την ΛΑΡΚΟ Γ.Μ.Μ.Α.Ε. |
el |
heal.abstract |
The production of ferronickel is a complex process which comprises two main stages, the reductive roasting of the laterite ores by solid fuels followed by the smelting of the material produced. The reductive roasting, i.e. the partial reduction of the iron oxides is carried out in the Rotary Kilns (R/K). Following this stage, the calcine which is produced by the R/K’s is fed into the Electric Arc Furnaces (EAF) where it undergoes reductive smelting. During this latter stage, the surplus of carbon leads to further reduction, which yields ferronickel at a typical concentration of 12-14% Ni.
The energy requirement of the R/K’s constitutes a large portion of the total energy required for the production of ferronickel. Therefore, the optimization of the reductive roasting stage contributes decidedly to the profitability of the method.
In the current thesis, the reductive roasting stage of three nickel-rich laterite ores was studied. The ores where from the deposits of Εvia, Αg. Ιoannis and Κastoria and their reduction by lignite, coal and coke was studied. Two sets of experiments were carried out. In the first set, reductive roasting was carried out by a mixture of solid fuels, while in the second batch of experiments, a mixture of ores was reduced via a mixture of solid fuels. The concentration of each of the constituents in the fuel mix followed from industrial practice established at LARCO S.A.
On the basis of the results, the highest degree of reduction was achieved for the Kastoria ore while the lowest was achieved for the ore of Αg. Ιoannis. Based on the reductive roasting experiments via mixtures of solid fuels it was established that a mix of 50 kg, coal, 150 kg lignite and 10 kg coke per ton of laterite led to higher degrees of reduction. |
en |
heal.advisorName |
Ξενίδης, Άνθιμος |
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heal.committeeMemberName |
Χαλικιά, Ηλιάννα |
el |
heal.committeeMemberName |
Παπασιώπη, Νυμφοδώρα |
el |
heal.academicPublisher |
Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Μηχανικών Μεταλλείων Μεταλλουργών. Τομέας Μεταλλουργίας και Τεχνολογίας Υλικών |
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heal.academicPublisherID |
ntua |
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heal.numberOfPages |
84 σ. |
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heal.fullTextAvailability |
true |
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