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Partial Replacement of Zircon by Waste Kiln Rollers

In the interest of cost reduction, ceramic tile manufacturers and suppliers have for several years been conducting various studies and industrial trials for the replacement of zirconium silicate, which is used for lending whiteness and opacity, by alternative materials.

Zircon is of particular use in the composition of ceramic engobes to generate their opacity to obscure body colour; and to produce the desired lightness (L) for subsequent design printing or glazing applications. Achieving a successful replacement depends on understanding the active mechanism of zircon to avoid consequences such as water­marks and engobe detachment defects resulting from substituting whitening agents.

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