...zirconia, mullite and clay. Substantial amounts of water are also used, particular in the milling of raw materials and to finish the fired tiles. To produce 1 000 square metres of tiles, between 8-18 cubic metres of water are needed for milling, 7-15 cubic metres for preparing the enamels, and 800 cubic metres for cutting, grinding and polishing. Tile production also generates waste, especially in ...