Materiales de Construcción, Vol 49, No 256 (1999)

Mineralogical and morphological changes of fly ashes with leaching phenomenon


https://doi.org/10.3989/mc.1999.v49.i256.435

J. Marta , Spain

M. I. Sánchez Rojas
Instituto Eduardo Torroja-CSIC, Spain

M. Frías
Instituto Eduardo Torroja-CSIC, Spain

Abstract


In this study, three Fly Ashes (FA) from Spanish Power Plants with CaO contents between 2-30% in weight were examined. They were leached using a variation on EPA-EP leaching test, checking the influence of the leaching process on FA. Leaches were analyzed by ICP. XRD and SEM-EDX technique were used to analyze the leached FA.
The study carried out was mainly centered in following the evolution of the most soluble elements and the formation of new secondary crystalline phases. The relationship between dissolution pH and the percentage of the extracted element was also confirmed.

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