Sökning: "Nzotta Mselly"

Hittade 4 avhandlingar innehållade orden Nzotta Mselly.

  1. 1. Experimental and modelling studies of sulphide capacities of some silicate and aluminate melts

    Författare :Mselly M. Nzotta; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 2. Sulphide capacities of mulicomponent slags

    Författare :Mselly M. Nzotta; KTH; []
    Nyckelord :;

    Sammanfattning : In the present thesis, experimental measurements have beencarried out to determine the sulphide capacities of the binaryslags Al2O3-MnO, "FeO"-SiO2, "FeO"-CaO, "FeO"-MnO, ternary slags Al2O3-MgO-SiO2, Al2O3-MnO-SiO2, Al2O3-CaO-MgO, MgO-MnO-SiO2, Al2O3-MgO-MnO,"FeO"-Al2O3-SiO2, "FeO"-CaO-SiO2, "FeO"-MgO-SiO2, "FeO"-MnO-SiO2,quatenary slags Al2O3-CaO-MgO-MnO, Al2O3- CaO-MgO-SiO2,Al2O3-CaO-MnO-SiO2, CaO-MgO-MnO-SiO2, quinary slag Al2O3-CaO-MgO-MnO-SiO2, and the six component slag "FeO"-Al2O3-CaO-MgO-MnO-SiO2.The technique used was to bring the melt to equilibrium witha gas mixturecontaining Ar-CO-CO2-SO2. LÄS MER

  4. 3. Measurements of the thermodynamic activities of chromium  and vanadium oxides in CaO-MgO-Al2O3-SiO2 slags

    Författare :Pengli Dong; Seshadri Seetharaman; Mselly Mbwambo Nzotta; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermodynamic activity; chromium oxide; vanadium oxide; equilibrium; slags; slag basicity; gas-equilibration technique; Metallurgical process engineering; Metallurgisk processteknik;

    Sammanfattning : In the present work, the thermodynamic activities of chromium and vanadium oxide in CaO-SiO2-MgO-Al2O3 slags were measured using gas-slag equilibration technique. The slag was equilibrated with a gas mixture of CO, CO2 and Ar gases enabling well-defined oxygen partial pressures in the gas mixture (PO2=10-3,10-4,10-5 Pa) at temperatures 1803, 1823K, 1873, 1923 K. LÄS MER

  5. 4. A Study of EAF Austenitic and Duplex Stainless Steelmaking Slags Characteristics

    Författare :Saman Mostafaee; Margareta Andersson; Pär Jönsson; Nzotta Mselly; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; EAF; Slag; Duplex steel; 304L stainless steel; Characterization; Microstructural evolution; Spinels; Basicity; Computational thermodynamics; Slag foaming; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

    Sammanfattning : The high temperature microstructure of the solid phases within the electric arc furnace (EAF) slag has a large effect on the process features such as foamability of the slag, chromium recovery, consumption of the ferroalloys and the wear rate of the refractory. The knowledge of the microstructural and compositional evolution of the slag phases during the EAF process stages is necessary for a good slag praxis. LÄS MER