Study on Washing Method of Hydrothermal Synthesis Zeolite from Coal Fly Ash

摘要

The large amount of waste lye was generated during hydrothermal synthetic zeolite from coal fly ash by microwave-assisted heating. The environment will be polluted, if the improper handing of waste lye, and discharged into the surface water. The washing process of the synthetic zeolite was studied in this paper. Rational recycling of waste lye and reduce the amount of it emissions in the washing process were found. By comparing the environmental effects and the technical and economic, the method of washing with water-acid-water was determined to be the best solution of the zeolite washed. The waste lye can be recovered in this method, and it will be used for preparation of lye in the next synthetic zeolite. Cost was saved, and emissions of waste lye was reduced, too.