The production of ceramic tiles results in the expulsion of many wastes. One of the waste substances which could be eliminated from the tile-making process is the exhausted lime which contains calcium fluoride as the main component. The maximum amount of exhausted lime which can be recycled without modifying the properties of the tiles is determined. The effects of the calcium fluoride on the microstructure of the tiles is investigated. It is discovered that addition of CaF2 greater than 0.5-1.0 wt% results in a strongly modified microstructure. Anorthite is produced at the expense of mullite leading to swelling of the tiles at the industrial firing temperatures.
Reactivity of CaF2 Toward Components of Ceramic Bodies / Andreola, Nora Maria; Manfredini, Tiziano; Pellacani, Gian Carlo; Romagnoli, Marcello. - STAMPA. - 2:(1992), pp. 994-999. (Intervento presentato al convegno Austceram 92 tenutosi a Melbourne nel 1992).
Reactivity of CaF2 Toward Components of Ceramic Bodies.
ANDREOLA, Nora Maria;MANFREDINI, Tiziano;PELLACANI, Gian Carlo;ROMAGNOLI, Marcello
1992
Abstract
The production of ceramic tiles results in the expulsion of many wastes. One of the waste substances which could be eliminated from the tile-making process is the exhausted lime which contains calcium fluoride as the main component. The maximum amount of exhausted lime which can be recycled without modifying the properties of the tiles is determined. The effects of the calcium fluoride on the microstructure of the tiles is investigated. It is discovered that addition of CaF2 greater than 0.5-1.0 wt% results in a strongly modified microstructure. Anorthite is produced at the expense of mullite leading to swelling of the tiles at the industrial firing temperatures.
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