Date of Award

8-1-2013

Degree Name

Master of Science

Department

Civil Engineering

First Advisor

Kolay, Prabir

Abstract

The extraction of cenospheres from fly ash and the study of their industrial applications have been extensively increased in the recent years. The efficient recovery of cenospheres without polluting the ash ponds or lagoons is a serious concern of the global community. Cenospheres of different density and particle sizes are now available in markets for various applications. The analysis of physical, chemical and mineralogical properties of cenospheres is important as these properties influence the quality of a product. This study finds that cenospheres exists in various densities and they vary in their physical, chemical and mineralogical properties. This research also incorporates the fabrication of a new dry separator system and subsequent modifications of the separator to extract cenospheres from fly ash. The dry method of separation of cenospheres from fly ash can be performed using a centrifugal air classifier. Several factors e.g., geometry and dimensions of the separation chambers, location and rate of the tangential air injection, speed of the rotor and the rate of feeding of sample are responsible for creating an appropriate air field inside the separation chamber for efficient separation. After several modifications, the extraction of cenospheres from fly ash is still a problem in the newly fabricated dry separator that needs further modification.

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