Sökning: "PHREEQC"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet PHREEQC.

  1. 1. Characterization of Raw Materials for Salt Extraction from Lake Katwe, Uganda

    Författare :Hillary Kasedde; Stefan Jonsson; Baohua Zhu; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lake Katwe; salt extraction; brine; evaporites; characterization; PHREEQC;

    Sammanfattning : Uganda is well endowed with economic quantities of salt evident in the interstitial brines and evaporite deposits of Lake Katwe, a closed saline lake located in the western branch of the great East African rift valley. Currently, rudimentally methods of salt mining based on solar evaporation of brine continue to be used for salt extraction at the lake. LÄS MER

  2. 2. Towards the Improvement of Salt Extraction from Lake Katwe Raw Materials in Uganda

    Författare :Hillary Kasedde; Pär Jönsson; Anders Tilliander; Eric Forssberg; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lake Katwe; salt extraction; brine; evaporites; saltpan; characterization; evaporation - crystallization; solubility; Pitzer ’s ion - interaction model; PHREEQC software; dissolution kinetics; Avrami model.;

    Sammanfattning : Uganda is well endowed with economic quantities of mineral salts present in the interstitial brines and evaporite deposits of Lake Katwe, a closed (endorheic) saline lake located in the western branch of the great East African rift valley. Currently, rudimentally and artisanal methods continue to be used for salt extraction from the lake raw materials. LÄS MER

  3. 3. The mobility of natural uranium at Forsmark, Sweden, through geologic time

    Författare :Lindsay Krall; Carl-Magnus Mörth; David Read; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; uranium; radium; mineralogy; geochronology; submarine groundwater discharge; spent nuclear fuel; geochemical modelling; Geology; geologi;

    Sammanfattning : In this thesis, the response of uranium minerals and poorly crystalline phases to changes in geochemical conditions through geological time has been assessed in order to understand the mobility of natural uranium in the fracture network of a proposed site for a spent nuclear fuel repository in Forsmark, Sweden. Identification and characterization of solid phase uranium have been performed through electron microprobe analysis and optical petrography (Article I). LÄS MER

  4. 4. Sorption and weathering properties of naturally occurring chlorites

    Författare :Åsa Gustafsson; KTH; []
    Nyckelord :chlorite; nickel; sorption; surface complexation; dissolution rate.;

    Sammanfattning : Chlorite is a ferrous silicate mineral occurring as afracture filling mineral in the Swedish granite bedrock thatsurrounds the area of the candidate Swedish geologicalrepositories for nuclear waste. To investigate the importance of chlorites as a naturalbarrier for radionuclide migration sorption of Ni(II) onto anatural chlorite was chosen as the studied system. LÄS MER

  5. 5. Weathering of mining waste rock containing alum shale and limestone

    Författare :Erik Puura; KTH; []
    Nyckelord :;

    Sammanfattning : Geochemical processes occurring in the waste rock dumps ofan old phosphate mine, located in Maardu, northem Estonia, havebeen studied and modelled. The waste rock contains pyritic,metalliferous and organic-rich shale, as well as limestone.Production of acidity during pyrite oxidation is a potentialmechanism for heavy metal release. LÄS MER