Publication Date:
2021-03-29
Description:
The dissolution kinetics of gypsum and anhydrite have been measured under various conditions. For gypsum an almost linear rate equation R=ks1(1-c/ceq)n1 is valid, where R is the surface rate, n1 1 is the kinetics order, c is the total calcium concentration at the surface, and ceq the equilibrium concentration with respect to gypsum. For the determination of the entire dissolution kinetics a batch set-up was used. This batch experiment reveals a dissolution rate equation R=ks1(1-c/ceq)n1 which switch close to equilibrium to a nonlinear rate equation R=ks2(1-c/ceq)n2 with n2 4.5. The experimentally observed dissolution rates from the batch experiment could be fitted by only minor variations with a mixed kinetics model. The rotating disk experiment on anhydrite reveals a surface controlled rate equation. For anhydrite the observed experimentally dissolution rates by a batch experiment are described by R=ks(1-c/ceq})n, where ks is the surface rate constant and n 4.2 is the kinetic order. Furthermore, a method for the determination of the rate equation parameters was developed ...
Description:
thesis
Keywords:
549
;
VJK 000
;
VHB 600
;
VGC 000
;
Experimentelle Geochemie
;
Sulfate, Chromate, Molybdate und Wolframate {Mineralogie}
;
Mineralchemie
Language:
German
Type:
monograph
,
publishedVersion
Format:
120 S.
Format:
application/pdf
