Journal Published Online: 09 July 2018
Volume 7, Issue 1

Dissolution and Leaching of Fly Ash in Nitric Acid Using Automated Scanning Electron Microscopy

CODEN: ACEMF9

Abstract

This article studies the physical and chemical changes in two Class F fly ashes exposed to 3 % HNO3 solution for 15 min. Automated scanning electron microscopy was used to simultaneously determine the physical and chemical properties of thousands of individual particles before and after being exposed to the solution.

Exposure for 15 min in the HNO3 solution resulted in the selective dissolution of particles containing over 30 % CaO content but did not cause significant physical or chemical changes in other particles for both fly ashes. In addition, the leaching of sulfur was observed from all particles. Two possible mechanisms are discussed. This work reveals that fly ash particle dissolution is not homogenous and is dependent on the chemical consistency of the particle. This work provides new insights into fly ash dissolution in aqueous solutions and characterization.

Author Information

Kim, Taehwan
School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia
Moradian, Masoud
Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK, USA
Ley, M. Tyler
Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK, USA
Pages: 17
Price: $25.00
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Stock #: ACEM20180016
ISSN: 2379-1357
DOI: 10.1520/ACEM20180016