Separation of Cenospheres from Fly Ashes by Floatation Method
Fly-ashes are non-combustible mineral residues which are produced from coal in thermal power plants.
Four different types of fly ashes were collected from different power station in Gujarat. Characterization
through SEM shows that fly ash contains cenosphere i.e. gas bubble containing ceramic particle independent
of their bulk density. Floatation technique was used for the separation of cenosphere from fly ash. Two
solvents with extremely different densities were used for the separation of cenospheres. All methods gave
approximately yield of less than 1% cenosphere in fly ash. Color of cenospheres varied from gray to almost
white and the value of density range from 0.4 – 0.8 g/cc. Further, chemical composition analysis revealed
that cenospheres do not contain any high concentration of hazardous elements.
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