YAŞ ÖĞÜTME VE MEKANİK DAĞITMANIN KIZILDAM HALLOYSİT CEVHERİNİN SİNTERLEME ÖZELLİKLERİNE ETKİSİ

Kaolin type clay ores are generally ground in mills in the ceramic industry and are included in the body composition. During grinding, hard, coarse-sized impurities are ground into finer size, got involved the body composition and increased defects that cause loss of quality. In this study, the Kızıldam halloyite ore was dispersed by mechanical mixing in the presence of sodium hegzametaphosphate, than it was eliminated from the 212 μm sieve, allowing the separation of hard minerals containing iron-bearing minerals from the relatively soft kaolin group clay minerals. -212 µm sized material that was gained from mechanical mixing and raw halloysite that was ground in the wet media were sintered in the wall tile (1145°C, 49 min.) and porcelain body (1205°C, 63 min.) sintering conditions, then the sintered materials were compared in terms of shrinkage, water absorption and color values. The L (whiteness) values of the materials that were gained with wet grinding were obtained as 64.55 and 58.14 in wall tile and porcelain sintering conditions respectively, while 73.07 and 70.76 were found for mechanical distribution. It was observed that the empurity removal from the halloysite ore by mechanical mixing increased the whiteness (L) value of the sintered product.