Titania slag is the primary product of ilmenite smelting, and serves as a feedstock to the TiO(2) pigment industry. The fine material (smaller than 106 mu m in diameter) which is produced during milling of titania slag is enriched in some impurities, notably SiO(2), Al(2)O(3), K(2)O and CaO. Investigation of microstructures of solidified slags confirmed that these oxides partition to the silicate phases which form during final solidification. The presence of silicates on the surfaces of particles in milled slag supports the suggestion that the silicates contribute to fracture during crushing and milling. No significant macro-segregation was found in the slag ingots. (C) 2008 Elsevier Ltd. All rights reserved.