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Percolation column tests and investigation of contaminant leaching from mineral wastes: theory and experiment with metallurgical slag
Gottvald, Matouš ; Ettler, Vojtěch (advisor) ; Vítková, Martina (referee)
Leaching represents an essential concept related to the natural processes that occur at the contact between solids and solutions. The leaching properties of mineral wastes point to the mobility of contained contaminants in various scenarios and, thus, the environmental risk of the wastes. Experimental tools have been developed to determine the leachability over a range of conditions and to be a part of the waste evaluation workflow. Special emphasis is given to the dynamic column leaching tests that approximate percolation occurring in the field and enable to describe the time dependence of leaching. Processes that are observed in full-scale systems may substantially differ from those in the laboratory simulations. Apart from the field experiments and geochemical modelling, also modifying the original leaching test protocols expands our awareness of the mineral waste behaviour. We performed a column leaching test. Secondary Pb metallurgical slag coming from the Pb-scrap recycling was leached according to the standardised column leaching test EN 14405 as a part of broader research on the leachability of slag exposed to the wetting-drying cycles. The cumulative leached mass of both metal and major elements was lower compared to the previous turn; bulk leached masses of the main contaminants related...

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4 Gottvald, Martin
2 Gottvald, Michael
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