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Removal of inclusions and trace elements from Al-Mg-Si alloys using refining fluxe
ID Kovačec, Uroš (Author), ID Zupanič, Franc (Author)

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Abstract
The cleanliness of aluminium alloys has a decisive effect on their properties and performance. In this work, the melts of several Al-Mg-Si alloys (6xxx series) were refined using rotary flux injection (RFI) of the salt fluxes in the industrial environment. A typical charge consisted of 25 % to 30 % external scrap, 45 % to 50 % internal scrap, and 20 % to 30 % primary aluminium. During injection, the entire melt volume was mixed uniformly. The melt was filtered using a porous ring filtration apparatus. The fraction and type of non-metallic inclusions were determined using light and scanning electron microscopy. The contents of alkali and alkaline-earth metals were determined using optical emission spectroscopy. The reduction of alkali and alkaline earth metals and the fraction of nonmetallic inclusions were used to evaluate the process efficiency and the flux selection for the regular production. An analysis of more than 100 industry charges confirmed that the flux selected after the experimental trials, consisting of a mixture of MgCl▫$_2$▫, KCl, NaCl and CaF▫$_2$▫, was effective in regular production.

Language:English
Keywords:aluminium, refinement, flux, cleanlines, non-mtalic inclusion, rotary injection, alkall element
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2025
Number of pages:7 str.
Numbering:Vol. 71, no. 9/10
PID:20.500.12556/RUL-177373 This link opens in a new window
UDC:669.71
ISSN on article:2536-3948
DOI:10.5545/sv-jme.2025.1371 This link opens in a new window
COBISS.SI-ID:259506435 This link opens in a new window
Publication date in RUL:22.12.2025
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Downloads:201
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Fakulteta za strojništvo
ISSN:2536-3948
COBISS.SI-ID:294943232 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Abstract:
Čistoča aluminijevih zlitin ima odločilen vpliv na njihove lastnosti in uporabnost. V industrijskem okolju smo rafinirali taline več Al-Mg-Si zlitin (serija 6xxx) s solnimi talili, ki smo jih vnašali v talino z rotacijskim vpihovanjem. Običajni vložek je bil sestavljen iz 25 % do 30 % zunanjega odpada, 45 % do 50 % notranjega odpada in 20 % do 30 % primarnega aluminija. Talina je bila med vpihovanjem talil enakomerno premešana in nato je bila filtrirana skozi porozni obročasti filter. Za opredelitev deleža in vrste nekovinskih vključkov smo uporabili svetlobno mikroskopijo in vrstično elektronsko mikroskopijo. Z optično emisijsko spektroskopijo je bil izmerjen delež alkalijskih in zemljoalkalijskih kovin. Zmanjšanje deleža alkalijskih in zemljoalkalijskih kovin ter deleža nekovinskih vključkov je bilo merilo za ovrednotenje učinkovitosti rafinacije in za izbiro rafinacijskega sredstva za redno proizvodnjo. Analiza več kot sto industrijskih vložkov je potrdila, da je bilo izbrano talilo, sestavljeno iz zmesi MgCl▫$_2$▫, KCl, NaCl in CaF▫$_2$▫, učinkovito tudi pri redni proizvodnji.

Keywords:aluminij, rafinacija taline, talilo, čistoča, nekovinski vključek, rotacijsko vbrizgavanje, alkalijski element

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