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. ...