Many types of industrial wastes, such as Al-rich anodizing sludge, Cr/Ni galvanizing sludge, foundry sand, ferrochromium fly ash and agricultural wastes, have been studied as ceramic glaze colorants, while the utilization of iron ore slag for ceramic glaze colorants has not been well considered [6–12]. Limited works have reported that reddish, black and blue
glazes could be prepared by using the iron ore slag as colorants [1,13]. However, impurities in the wastes can affect the color of glazes as well as the decorative quality of products, which limit its applications and further commercial success.
Fortunately, these problems could be solved by using iron ore slag as the separative-phase glaze colorant.