Yadong Zhang, Ming Li, Dong Liu, Xulian Hou, Jinglun Zou, Xiaotong Ma, Fanyi Shang, Zhaowen Wang
In this work, aluminum and iron existing in coal fly ash were extracted by the method of hydrochloric acid leaching. Effects of solid-liquid ratio, reaction temperature, reaction time, acid concentration, and raw ash mesh on recovery efficiencies of Al2 O3 and Fe2 O3 were investigated. X-ray diffraction analysis indicated that anhydrite, hematite, mullite and quartz were the dominant minerals in the raw fly ash sample. X-ray fluorescence technique was applied to determine the mass fractions of chemical components in the raw ash and leached residues, while the concentrations of Al2 O3 and Fe2 O3 in leaching solutions were measured by titration method...
February 15, 2018: Environmental Technology