Sökning: "fluorite"

Visar resultat 1 - 5 av 19 avhandlingar innehållade ordet fluorite.

  1. 1. A surface approach to understanding the dissolution of fluorite type materials : Implications for mineral dissolution kinetic models

    Författare :José Ricardo Assunção Godinho; Sandra Piazolo; Andreas Lüttge; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dissolution; topography; fluorite; surface; geokemi; Geochemistry;

    Sammanfattning : Traditional dissolution models are based in the analyses of bulk solution compositions and ignore the fact that different sites of a surface dissolve at different rates. Consequently, the variation of surface area and surface reactivity during dissolution are not considered for the calculation of the overall dissolution rate, which is expected to remain constant with time. LÄS MER

  3. 2. Dissolution of fluorite type surfaces as analogues of spent nuclear fuel : Production of suitable analogues and study the effect of surface orientation on dissolution

    Författare :Jose Godinho; Sandra Piazolo; Tonci Balic-Zunic; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fluorite; spent nuclear fuel; crystal structure; CeO2; CaF2; crystal orientation; topography; confocal profilometry; Mineralogy; Mineralvetenskap; Geology; geologi;

    Sammanfattning : It is accepted worldwide that the best final solution for spent nuclear fuel is to bury it in deep geological repositories. Despite the physical and chemical barriers that are supposed to isolate the nuclear waste for at least 100.000 years, some uncertainty factors may cause underground water to get in contact with the nuclear waste. LÄS MER

  4. 3. The channeling technique applied to disorder analysis of single crystals of the fluorite type

    Författare :Göran Skog; Kvartärgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:1978:Skog;

    Sammanfattning : [abstract missing].... LÄS MER

  5. 4. Surface complexation at calcium mineral-water interfaces

    Författare :Liuming Wu; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

    Sammanfattning : Surface reactions occurring at solid-water interfaces in calcium mineral-ligands systems have been studied. Both hydrous apatite and fluorite surfaces show clear amphoteric properties. An ion exchange process between lattice ions of F- on fluorite and OH- ions in bulk solution is discovered. LÄS MER

  7. 5. Fluid inclusion studies of the Laisvall sandstone lead-zinc deposit, Sweden

    Författare :Sten Lindblom; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The ore forming environment at Laisvall was characterized by a total salt content of 24 eq. wt-% NaCl with as much as 9 wt-% CaCl2. Its temperature fluctuated between 180°C and 120°C but generally decreased with time. The cementing mineral assemblage was deposited in the general sequence calcite, barite, fluorite, galena, sphalerite. LÄS MER