Sökning: "Non-ferrous"

Visar resultat 6 - 10 av 15 avhandlingar innehållade ordet Non-ferrous.

  1. 6. Influences of alumina on fayalite-type slags properties : an experimental study on leaching and melting behaviours

    Författare :Sina Mostaghel; Dan Berg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Recycling of secondary raw materials by non-ferrous metal producers is steadily increasing. These materials inevitably introduce various impurities to the production furnaces, which can change the chemical composition, and thereafter, the physical and chemical properties of the products and by-products. LÄS MER

  3. 7. Novel boron compounds in lubrication

    Författare :Mamoun Taher; Mark Rutland; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : Lubricants are used to control friction and reduce wear by preventing direct contact between surfaces in a relative motion. Most of the modern lubricants and lubricant additives have been designed and optimized for ferrous materials. LÄS MER

  4. 8. Sulphide mineral flotation : a new insight into oxidation mechanisms

    Författare :Alireza Javadi; Jan D. Miller; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

    Sammanfattning : Formation of hydrogen peroxide (H2O2), an oxidizing agent stronger than oxygen, by sulphide minerals during grinding was investigated. It was found that pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite ((Zn,Fe)S), and galena (PbS), which are the most abundant sulphide minerals on Earth, generated H2O2 in pulp liquid during wet grinding in the presence or devoid of dissolved oxygen in water and also when the freshly ground solids are placed in water immediately after dry grinding. LÄS MER

  5. 9. Environmental factors and p53 mutation spectrum in lung cancer

    Författare :Anna Bessö; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Lung cancer; p53; radon; tobacco smoking; arsenic; environmental tobacco smoke; ETS; case-only study; case-control study;

    Sammanfattning : The use of molecular biomarkers, such as mutations in the p53 gene, has raised expectations for improving the resolution power in epidemiological studies. In this thesis we assessed the influence of smoking, environmental tobacco smoke (ETS), residential radon and arsenic on the p53 mutation prevalence and spectrum in lung tumors. LÄS MER

  7. 10. Flotation chemistry of complex sulphide ores : recycling of process water and flotation selectivity

    Författare :Fatai Kolawole Ikumapayi; Jaakko Leppinen; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineral Processing; Mineralteknik;

    Sammanfattning : Recycling of flotation effluents through the ore processing plant is one of the ways of reducing both plant-operating costs and industrial impact onto the local ecosystem. Such waters named acid mine drainage (AMD), if discharged from sulphide flotation are gypsum (CaSO4.H2O) saturated and have a high salinity (on the order of 1000 ppm). LÄS MER