A PROCESS FOR PRODUCING GLAZED CERAMIC TILE FROM WATER GRANULATED FERROCHROME SLAG

摘要

The present invention relates to the technology of utilizing waste ferrochrome slag to produce glazed ceramic tiles. The present invention utilizes ferrochromium slag: (1) to produce unglazed sintered tiles (2) as a source of Cr2O3 for dye purpose in glaze part of tiles. The raw materials for preparation of unglazed sintered part of the tile consist of water granulated ferrochrome slag, kaolin clay. The raw materials for preparation of the glazes consist of silica, borax, ZrO2, ZnO, CaO, B2O3 and FeCr slag. The production process for making of unglazed part includes grinding/milling of slag into fine powders, mixing with kaolin clay and moisture, shaping in press and sintering at 1100-1200 o C for 2-3 hr. the method of making frits and glaze application includes mixing ferrochrome slag powder with oxide powders (silica, borax, ZrO2, ZnO, CaO, B2O3), melting the mixture at 1550 o C, water quenching to make frits, milling the frits to form frits powder, making slurry of frits powder with water and 0.2% bentonite, painting the slurry on unglazed part, firing at 1050 o C for 10 min, cooling inside furnace.