Characterization of Waste Sludge Pigment from Production of ZnCl2

This study is focused on the treatment of waste sludge from a zinc chloride production in order to prepare iron-rich pigments usable for glazes. In galvanizing plants, yellow containing significant amount ZnO, Cl, and Fe2O3, formed. raw cannot be used as pigment glaze. Therefore, three methods treating this material were proposed: (a) washing with H2O, (b) calcination at 180 °C by (c) 900 H2O. These helped reduce Zn Cl content up 97%. According X-ray fluorescence analysis percentage Fe2O3 increased ~41% ~98%. power diffraction confirmed formation α-Fe2O3 (hematite) prepared. Scanning electron microscopy Energy dispersive showed clusters rounded particles, also change size particles after was observed. Particle size, specific surface area, density measurements together thermogravimetric differential thermal analyses performed. Pigments prepared added transparent glaze amounts 1, 5, 10, 15 wt.%. Pigment-containing glazes applied spraying fired ceramic tiles then 1060 °C. Color determined (Commission Internationale de l’Eclairage) CIE L*a*b* coordinates colorless, light brown shades, brown-red, brown-yellow, deep red-brown. Comparison colors using commercial Waste can an alternative products.