Sökning: "Mineral Chemistry"

Visar resultat 31 - 35 av 166 avhandlingar innehållade orden Mineral Chemistry.

  1. 31. Adsorption of heptyl xanthate at the metal sulphide/aqueousinterface

    Författare :Andreas Fredriksson; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : In sulphide mineral flotation a sufficient hydrophobicity of the mineral surfaces is obtained by the adsorption of collector chemicals at the metal sulphide/aqueous interface. This surface alteration is of fundamental and applied interest. LÄS MER

  3. 32. Kinetics of collector in-situ adsorption on metal sulphide surfaces studied by ATR-FTIR spectroscopy

    Författare :Andreas Fredriksson; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : In sulphide mineral flotation, a sufficient hydrophobicity of the mineral surfaces is obtained by the adsorption of collector chemicals at the metal sulphide/aqueous interface. This surface alteration is of fundamental and applied interest. LÄS MER

  4. 33. A nuclear magnetic resonance study of dialkyldithiophosphate complexes : polycrystalline and surface adsorbed

    Författare :Anna-Carin Larsson; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : 31P, 13C and 207Pb NMR were used to characterize different metal (Ni, Zn, Pb) dialkyldithiophosphate complexes. Eight different sodium or potassium dialkyldithiophosphate salts (alkyl groups R=ethyl-, n-propyl, iso-propyl, n- butyl, iso-butyl, sec-butyl, iso-amyl and cyclo-hexyl) were used as starting materials. LÄS MER

  5. 34. Surface reactions in aqueous metal sulfide systems

    Författare :Zhongxi Sun; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : Surface reactions in aqueous metal sulfide systems have been studied. The composition and stability of various complexes at the PbS-H20 the PbS/H20 and ZnS/H20 interface were evaluated. LÄS MER

  7. 35. Spectroscopic studies of colloidal ZnS

    Författare :Rune Gärd; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : This thesis is a summary and discussion of four papers, mainly dealing with reactions at the ZnS/water interface. The main analysis method has been spectroscopy. In mineral concentration plants valuable minerals are rendered hydrophobic by the action of certain surface active molecules, so called collectors. LÄS MER