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Fly Ash Lab Report

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Fly Ash Lab Report
Calcium
Calcium is present in fly ash in multiple modes of occurrence, primarily lime, anhydrite, calcite and within the glassy matrix. It is the most largely released cation (Kim et al., 2003). In the present column experiment, leached concentration of calcium was recorded as 50 ppm at 10th day of experiment. At 20th day of experiment, calcium concentration in leachate was found as 120 ppm. While at 30th day of experiment, calcium concentration in leachate was 280 ppm and at 45th day it was 450 ppm. Calcium showed a pH independent leaching behavior. Calcium is found to be leached from fly ash throughout the study period. The concentration of calcium in leachate was found to be increased with respect to time. The maximum concentration of leached calcium was found at 45th day of experiment as 450 ppm.
Magnesium
Magnesium was not found to be present in leachate collected at 10th day of column experiment. At 20th day of experiment it was observed in very small amount as 6.2 ppm. While at 30th day and 45th day of experiment, magnesium concentration in leachate was found as 70 ppm and 150 ppm respectively. The minimum concentration of …show more content…
It is due to the extremely slow dissolution rates of the glassy matrix and crystalline aluminosilicate phases (Dudas, 1981). Aluminium was found to be leached from fly ash in column study, as 0.5 ppm at 10th day of experiment. At 20th day of experiment, concentration of aluminium in leachate was recorded as 1.4 ppm and at 30th and 45th day of experiment it was found as 2.5 and 3.8 ppm respectively. The Aluminium was found to be leached throughout the study period in both alkaline and acidic condition of ash slurry into the column but the leaching was found to be more with increasing time as the pH was decreased. Aluminium is considered as amphoteric element (Makela, 2012) which can leach in both alkaline and acidic
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