Search for dissertations about: "Bo Björkman"

Showing result 1 - 5 of 12 swedish dissertations containing the words Bo Björkman.

  1. 1. Quantitative equilibrium calculations on systems with relevance to copper smelting and converting

    University dissertation from Umeå : Umeå universitet

    Author : Bo Björkman; Umeå universitet.; [1984]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Assessment of silicate systems; model for liquid silicates; lead silicates; iron silicates; cuprous silicates; quantitative equi¬librium calculations; emf measurements; Gibbs free energy; cup¬rous sulphide; dicalcium ferrite; wüstite-calcia solid solution; copper smelting and converting;

    Abstract : The present thesis gives a summary of results obtained through theoretical and experimental studies of systems with relevance to copper smelting and converting.Many chemical elements are involved in the copper production pro­cesses and a detailed experimental study would be very time- consuming and expensive. READ MORE

  2. 2. Bio-coal as an alternative reducing agent in the blast furnace

    University dissertation from Luleå : Luleå University of Technology

    Author : Asmaa El-Tawil; Lena Sundqvist Öqvist; Bo Björkman; Henrik Saxen; [2020]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Devolatilization; torrefied biomass; bio-coal; volatile matter; reduction; blast furnace; Process Metallurgy; Processmetallurgi;

    Abstract : The steel industry is aiming to reduce CO2 emissions by different means; in the short-term, by replacing fossil coal with highly reactive carbonaceous material like bio-coal (pretreated biomass) and, in the longer term, by using hydrogen. The use of bio-coal as part of top charged briquettes also containing iron oxide has the potential to lower the thermal reserve zone temperature of the Blast furnace (BF) and, due to improved gas efficiency, thereby give a high replacement ratio to coke. READ MORE

  3. 3. Blast furnace coke properties and the influence on off-gas dust

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Maria Lundgren; Luleå tekniska universitet.; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Abstract : In blast furnace ironmaking, efforts are made to decrease the coke consumption mainly by increasing the pulverized coal injection rate. This will cause changes in in-furnace reduction conditions, burden distribution and demands on raw material strength, etc. READ MORE

  4. 4. Avoiding slopping in top-blown BOS vessels

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Mats Brämming; Luleå tekniska universitet.; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering - Metallurgical process and manufacturing engineering; Kemiteknik - Metallurgisk process- och produktionsteknik; Process Metallurgy; Processmetallurgi;

    Abstract : Slag formation plays a decisive role in all steelmaking processes. In top-blowing Basic Oxygen Steelmaking (BOS), i.e. in the LD process, an emulsion consisting of liquid slag, dispersed metal droplets and solid particles will, together with process gases, form an expanding foam. READ MORE

  5. 5. Interactions between iron oxides and the additives quartzite, calcite and olivine in magnetite-based pellets

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Pär Semberg; Luleå tekniska universitet.; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Abstract : In the present study, magnetite pellets with large amounts of the additives olivine, calcite and quartzite were isothermally reduced in a tubular furnace to study the interaction between iron oxides and the additives. A first attempt at using exaggerated amounts of additives was made in order to enable analyses of phases that do not otherwise occur in sufficient amounts for Xray diffraction and EDS-analyses. READ MORE