Sökning: "process metallurgy"

Visar resultat 21 - 25 av 410 avhandlingar innehållade orden process metallurgy.

  1. 21. An Operational View on Foaming and Slopping Control in Top-blown BOS Vessels

    Författare :Mats Brämming; Henrik Saxén; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : 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, undissolved particles and solid precipitates will, together with process gases, form an expanding foam. LÄS MER

  3. 22. Fundamental Studies on Direct Chromium Alloying by Chromite Ore with Designed Alloying Precursor

    Författare :Xianfeng Hu; Timo Fabritsius; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Chromium is an important alloying element for stainless steels and other Cr-bearing steels. During the steelmaking process chromium is added to the steels mainly in the form of ferrochrome, which is largely produced by the energy-intensive smelting reduction process of chromite ore in the submerged arc furnace. LÄS MER

  4. 23. Hydrometallurgical upgrading of a tetrahedrite-rich copper concentrate

    Författare :Samuel Ayowole Awe; Gouzhu Ye; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Removal of impurity elements in copper metallurgy is one of the major problems encountered today since pure copper ore reserves are becoming exhausted and the resources of unexploited ores often contain relatively high amounts of antimony, arsenic, mercury and bismuth, which need to be eliminated. The present work aims at pre-treating a tetrahedrite rich complex copper sulphide concentrate by selective dissolution of the impurities, therefore, upgrading it for pyrometallurgical processing. LÄS MER

  5. 24. Antimony recovery from complex copper concentrates through hydro- and electrometallurgical processes

    Författare :Samuel Ayowole Awe; Olof Forsén; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Today, one of the major difficulties confronted during copper metallurgy is the elimination of antimony and arsenic impurities from the process. This is because the pure copper ore reserves are becoming exhausted and the resources of unexploited ores often contain relatively high amounts of antimony and arsenic. LÄS MER

  7. 25. The use of LCA for the environmental evaluation of the recycling of galvanized steel

    Författare :Christina Viklund-White; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : The goal for this project was to build and spread knowledge about the use of LCA in the metallurgical industry, as well as to evaluate the use of LCA within the metallurgical industry in general, particularly for the management of waste- and by-products. For this, the assessment of the recycling of zinc coated scrap to an electric arc furnace was considered as a suitable case study. LÄS MER