Red mud as a substitute coloring agent for the hematite pigment

Red mud (RM), a highly alkaline iron oxide rich sludge obtained during the production of alumina, was treated to work as a coloring agent for ceramic glazes. The approach aims the valorization of this residue, adding environmental and economic value. RM was sintered at different temperatures (1100 degrees C, 1150 degrees C, 1200 degrees C, 1250 degrees C, 1300 degrees C and 1350 degrees C) to assess changes in its mineralogical composition. The obtained powders were characterized by XRD, UV Vis and CIELab. The samples were added to glazes (transparent, opaque and matte) and their color stability analyzed by CIELab. RM sintered at 1300 degrees C was compared with commercial hematite producing lower coloring power but yielding better color stability on glazes for temperatures of 1100 degrees C +/- 15 degrees C, thus presenting RM_1300C as a suitable substitute for the hematite pigment.