Chandra, N and S S, Amritphale and Baghel, N.S and Voskresenskaya, E.N and Pashkov, G.L. and Sharma, P (2008) Coal Fly Ash Utilization: Low Temperature Sintering of Wall Tiles. Waste Management.

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Abstract

We present here a study of the sintering of fly ash and its mixture with low alkali pyrophyllite in the presence of sodium hexa meta phosphate (SHMP), a complex activator of sintering, for the purpose of wall tile manufacturing. The sintering of fly ash with SHMP in the temperature range 925–1050 °C produces tiles with low impact strength; however, the incremental addition of low alkali pyrophyllite improves impact strength. The impact strength of composites with ⩾40% (w/w) pyrophyllite in the fly ash–pyrophyllite mix satisfies the acceptable limit (19.6 J/m) set by the Indian Standards Institute for wall tiles. Increasing the pyrophyllite content results in an increase in the apparent density of tiles, while shrinkage and water absorption decrease. The strength of fly ash tiles is attributed to the formation of a silicophosphate phase; in pyrophyllite rich tiles, it is attributed to the formation of a tridymite-structured T-AlPO4 phase. Scanning electron micrographs show that the reinforcing rod shaped T-AlPO4 crystals become more prominent as the pyrophyllite content increases in the sintered tiles.

Item Type:	Article
Subjects:	Waste-to-Wealth
Divisions:	UNSPECIFIED
Depositing User:	Mr. B.K. Prasad
Date Deposited:	10 Jan 2014 07:49
Last Modified:	11 Mar 2014 13:04
URI:	http://ampri.csircentral.net/id/eprint/946

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