Kinetic aspects of basaltic glass dissolution at 90°C: role of aqueous silicon and aluminium

The dissolution rates of natural glasses as a function of their composition at pH 4 and 10.6, and temperatures from 25 to 74°C

“…Ewing and Haaker, 1979;Byers et al, 1985;Lutze et al, 1985). To model the long-term behaviour and stability of this radioactive waste confinement host studies have concentrated on laboratory corroded basaltic and synthetic borosilicate glasses and naturally altered basaltic glasses (Furnes, 1975(Furnes, , 1978Seyfried Jr. and Bischoff, 1979;Allen, 1982;Malow et al, 1984;Crovisier et al, 1983Crovisier et al, , 1985Crovisier et al, , 1987Crovisier et al, , 1989aCrovisier et al, , 1989bGrambow, 1985;Grambow et al, 1985;Berger et al, 1987Berger et al, , 1988Berger et al, , 1994Gislason and Eugster, 1987a;Eggleton et al, 1987;Guy and Schott, 1989;Murukami et al, 1989;Jercinovic et al, 1990aJercinovic et al, , 1990bAdvocat et al, 1990Advocat et al, , 1991Advocat et al, , 1998Nesbitt and Wilson, 1992;Ghiara et al, 1993;Gislason et al, 1993;Morgenstein and Shettel, 1994;Daux et al, 1994Daux et al, , 1997Leturcq et al, 1999;Abraitis et al, 2000;Techer et al, 2001). Most of the natural glass dissolution studies were performed in either high ionic strength/seawater solutions or at high temperatures, and many were carried out in closed system batch reactors.…”

Pedogenesis and weathering rates of a Histic Andosol in Iceland: Field and experimental soil solution study

“…The dissolution rate expression for basaltic glass (Eq. (2)) ( Gislason and Oelkers, 2003) with the addition of the saturation effect (ΔG r ) of the hydrated glass with respect to the reacting solutions (Daux et al, 1997) can be written as…”

“…(2) is between 0.99 and 1 and the dissolution rate is independent of the saturation state of the dissolving hydrated glass (Daux et al, 1997;Gislason and Oelkers, 2003). When ΔG r is − 4 kJ mol − 1 the last term is 0.8 and the dissolution rate is slowed down by 20%.…”

Influence of electric arc furnace slag on characterisation of the produced geopolymer composites

“…On the contrary, using 75% EAFS gives total M 2 O/Al 2 O 3 , total M 2 O/SiO 2 and SiO 2 /Al 2 O 3 equal to 2.08, 0.20 and 6.54, respectively, the increased previous ratios results in lowering in strength where the formed geopolymer structure is of two dimensional chains from poly-sialate disilioxy rather than the three dimensional network formed by using 50% EAFS, in addition to the pessimum effect of the increased iron content as stated by Daux et al [44] where, dissolution of aluminosilicate precursors containing significant levels of network-forming Fe 3+ under slightly alkaline conditions, reprecipitation of dissolved Fe was much faster than the reprecipitation of Si and Al. It is therefore most likely that any reactive Fe present during geopolymerization behaves similarly, and reprecipitates very rapidly as hydroxide or oxyhydroxide phases and so lowers the alkali activator content necessary for the activation.…”