The zinc-bearing iron-rich mineral material (wasted magnetite, WMT) was separated from an iron-rich industrial solid waste. This WMT was applied as a heterogeneous Fenton catalyst to investigate decolorization and degradation of the azo-dye orange G (OG) in wastewater. The Fenton catalytic activity of WMT was explored in batch experiments conducted under varying conditions with the emphasis placed on the evaluation of the performance properties via their Fenton process optimization. The result showed that WMT-catalyzed heterogeneous Fenton reactions mostly followed zero-order kinetic model (R²>0.96) in dark irradiation, and followed pseudo-first-order kinetic model (R²>0.97) in visible irradiation. Moreover, WMT represented good heterogeneous photo-Fenton catalytic activity for the OG oxidative removal in the process. It is suggested that WMT may be a potential heterogeneous photo-Fenton catalyst available for the removal of the azo-dyes under the irradiation condition.