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Primary Study of the Phase Relationship in the MgO-"V2O3" System at 1873 K and pO2=10-11 atm
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM).
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Vanadium can be found in some iron ores as an impurity. Since vanadium is a valuable alloy element there lies an interest in development of a stable and economic way for extraction of it. For this, knowledge about the thermodynamics behind the V-O system combined with other elements, like Mg, is indispensable. A transitional metal like vanadium exists in multiple valences which makes it difficult to study. When vanadium oxide is mixed with other metal oxides the vanadium tends to concentrate in spinels. To investigate the types of phases formed in the Mg-O-V system at 1873 K and an oxygen partial pressure of 10-11 atm, multiple samples containing MgO and V2O3 in different proportions were equilibrated under these conditions. The samples were examined using SEM/EDS and XRD. A three, one and two phase region were found during analysis. In the three phase region MgV2O4, Mg2VO4 and an unidentified solid solution were found when the fraction of V2O3 was 0,234 and 0,448. In the one phase region only MgV2O4 was found at a V2O3 fraction interval of 0,500-0,530. Lastly in the two phase region MgV2O4 and V2O3 was found within the V2O3 fraction interval of 0,549-0,799. In conclusion when there was a higher amount of V2O3 more vanadium rich spinels were formed until a certain point where the spinel was saturated.

Abstract [sv]

Vanadin finns i vissa typer av järnmalm som ett spårämne. Eftersom vanadin är ett värdefullt legeringsämne finns det ett stort intresse av att hitta ett hållbart och ekonomiskt sätt att utvinna detta. För att göra det krävs kännedom om termodynamiken bakom V-O-systemet kombinerat med andra ämnen som Mg. Övergångsmetaller som vanadin existerar i ett flertal valenser vilket kan göra det svårt att undersöka dem. När vanadinoxid blandas med andra metalloxider tenderar vanadin att samlas i spineller. För att undersöka vilka faser som bildas i Mg-O-V-systemet vid 1873 K och ett syrepartialtryck på 10-11 atm läts en serie prover bestående av olika andelar MgO och V2O3 nå jämvikt under dessa förhållanden. Analys av dessa prover gjordes med SEM/EDS och XRD. Analysen visade att det existerade ett tre-, en- och tvåfasområde i serien. I trefasområdet hittades MgV2O4, Mg2VO4 och en oidentifierad fast lösning vid V2O3- fraktionen 0,234 och 0,448. I enfasområdet hittades MgV2O4 vid V2O3-fraktionen 0,500-0,530. Till sist hittades MgV2O4 och V2O3 i tvåfasområdet vid V2O3-fraktionen 0,549-0,799. Utifrån detta drogs slutsatsen att mer vanadinrika spineller bildades då fraktionen V2O3 ökar till en viss gräns efter vilken spinellfasen blev mättad.

Place, publisher, year, edition, pages
2018. , p. 28
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-231901OAI: oai:DiVA.org:kth-231901DiVA, id: diva2:1230822
External cooperation
SSAB AB Oxelösund
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-07-04Bibliographically approved

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