Hemijska industrija 2012 Volume 66, Issue 5, Pages: 781-786
https://doi.org/10.2298/HEMIND120228038B
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Evaluation of leaching behavior and immobilization of zinc in cement-based solidified products
Barbir Damir (University of Split, Faculty of Chemistry and Technology, Department of Inorganic Technology, Split, Croatia)
Dabić Pero (University of Split, Faculty of Chemistry and Technology, Department of Inorganic Technology, Split, Croatia)
Krolo Petar (University of Split, Faculty of Chemistry and Technology, Department of Inorganic Technology, Split, Croatia)
This study has examined leaching behavior of monolithic stabilized/solidified
products contaminated with zinc by performing modified dynamic leaching test.
The effectiveness of cement-based stabilization/solidification treatment was
evaluated by determining the cumulative release of Zn and diffusion
coefficients, De. The experimental results indicated that the cumulative
release of Zn decreases as the addition of binder increases. The values of
the Zn diffusion coefficients for all samples ranged from 1.210-8 to
1.1610-12 cm2 s-1. The samples with higher amounts of binder had lower De
values. The test results showed that cement-based
stabilization/solidification treatment was effective in immobilization of
electroplating sludge and waste zeolite. A model developed by de Groot and
van der Sloot was used to clarify the controlling mechanisms. The controlling
leaching mechanism was found to be diffusion for samples with small amounts
of waste material, and dissolution for higher waste contents.
Keywords: stabilization/solidification (S/S), ordinary Portland cement, NEN 7345: 2004, Zinc (Zn)