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Title:DOLOČANJE MAGNEZIJA V NODULATORJIH FEROSILIKO MAGNEZIJ FeSiMg 25-5-1 Z ICP-OES
Authors:ID Hamzić Gregorčič, Staša (Author)
ID Brodnjak-Vončina, Darinka (Mentor) More about this mentor... New window
Files:URL VS_Hamzic_Gregorcic_Stasa_2013.pdf (2,11 MB)
MD5: A956F872AA5991154EC919AB4650B4BF
 
Language:Slovenian
Work type:Undergraduate thesis
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Osnovna dejavnost podjetja TDR Ferolegure d.o.o. je proizvodnja in prodaja legur, med katere spadajo nodulatorji, cepiva in polnjene žice. V nalogi bomo izpostavili nodulatorje z besedo ferosiliko magnezij, FeSiMg. Nodulatorji so po sestavi visokokakovostne kompleksne zlitine, katerih osnovna naloga je vnos magnezija v sivo litino. FeSiMg delajo iz osnovne zlitine FeSi, ki mu dodajajo določen delež magnezija, ki je glavni element v zlitinah. Zlitine FeSiMg vsebujejo 5 do 35 % magnezija. Poleg magnezija zlitina vsebuje še naslednje osnovne elemente: Si, Al, Ca, Fe in redke zemlje, predvsem Ce, La, Pr, Nd in druge lantanide – pod skupnim imenom ''Mischmetall'' (MM). Namen diplomske naloge je certificiranje vrednosti masnega deleža magnezija v FeSiMg 25 – 5 – 1. Število 25 pomeni, da je masni delež magnezija v zlitini 25%, kar prišteva ta nodulator k skupini predlegur tipa FeSiMg z visoko vsebnostjo magnezija (5 za 5% Ca, 1 za 1% CeMM). Za zagotavljanje zanesljive vsebnosti magnezija je potreben ustrezen analizni postopek, pri katerem sta pomembna parametra ponovljivost postopka in pravilnost rezultatov. Zaradi specifičnih karakteristik magnezija se v nalogi osredotočamo na določanje magnezija v vzorcu z optično emisijsko spektrometrijo z induktivno sklopljeno plazmo, ICP–OES. Za primerjavo rezultatov smo vzorce vzporedno analizirali z že uveljavljeno metodo kot referenčno metodo, s kompleksometrično titracijo, ki pa je v nalogi ne bomo statistično obravnavali. Študirali smo tudi vpliv načina vzorčenja na analizo zlitine in s tem povezano homogenost vzorca. Obdelali smo pripravo vzorcev za analizo in ugotovili potrebne eksperimentalne pogoje za magnezij. V zlitini ima vsak element svojo določeno vlogo. Zato smo obdelali medelementne vplive, ki smo jih primerjali na podlagi rezultatov, dobljenih z analizo multielementnih vzorcev in vzorcev, pripravljenih s postopkom vakuumske filtracije, da smo izločili druge osnovne elemente kot možne interference. Kakovost FeSiMg je glede zrnatosti in kemijske sestave območij vsebnosti Si, Al, Ca, Fe, Mg in redkih zemelj prilagojena zahtevam kupca, zato mora biti v ozkem koncentracijskem območju zanesljivo nadzorovana.
Keywords:ICP OES, nodulatorji, ferosiliko magnezij, FeSiMg, kompleksometrična titracija, EDTA
Place of publishing:Maribor
Publisher:[S. Hamzić Gregorčič]
Year of publishing:2013
PID:20.500.12556/DKUM-42173 New window
UDC:669.721.5:543.061(043.2)
COBISS.SI-ID:17452310 New window
NUK URN:URN:SI:UM:DK:DOJ6AQFE
Publication date in DKUM:10.10.2013
Views:2960
Downloads:103
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:DETERMINATION OF MAGNESIUM IN NODULARISES FERROSILICON MAGNESIUM FeSiMg 25-5-1 BY ICP-OES
Abstract:The main activity of the company TDR Ferolegure d.o.o., is the production and sale of alloys, including nodularises, inoculants and cored wires. This thesis refers to nodularises with the term Ferrosilicon Magnesium (FeSiMg). Nodularises are structurally high quality complex alloys mainly used for magnesium addition into grey cast iron. FeSiMg is produced from the basic alloy FeSi by adding a certain amount of magnesium as the alloy’s main element. FeSiMg alloys contain between 5 – 35% of magnesium. In addition to magnesium, the alloy contains the following elements: Si, Al, Ca, Fe and rare earths, especially Ce, La, Pr, Nd and others lanthanides – under the common name ‘’Mischmetall’’ (MM). Purpose of this thesis is the certification of the mass fraction of magnesium in FeSiMg 25 – 5 – 1. The number 25 indicates that the mass fraction of magnesium in the alloy is 25%, this classifies this nodulariser as a magnesium-rich master alloy (5% Ca, 1% CeMM). To ensure the required amount of magnesium we need an appropriate analytical procedure, with a focus on repeatability and accuracy. Due to the specific characteristics of magnesium the thesis focuses on two analytical methods for determination of magnesium content, which are also compared. A study of how the sampling method affects the analysis of the alloy and the related sample homogeneity is included. We did a sample preparation and determined the required experimental conditions for magnesium. Within the alloy each element has a certain role. Therefore, we studied the inter - elemental effects, and compared them based on the results from the analysis of multi - elemental samples and samples prepared through vacuum filtration to eliminate other elements as possible interferences. The samples are analyzed with inductively coupled plasma optic emission spectrometry (ICP – OES). We determine the mass fraction of calcium and magnesium in the filtered samples for the determination of magnesium through complexometric titration. The quality of FeSiMg is regarding the granularity and chemical composition of content ranges of Si, Al, Ca, Fe, Mg and lanthanides determi adjusted to the client’s needs, therefore we need to ensure reliable control within a narrow concentration range.
Keywords:ICP OES, nodularises, ferrosilicon magnesium, FeSiMg, complexometric titration


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