Basic Research on Selective Extraction of Iron from Titanium Dioxide Waste Acid to Prepare Iron Phosphate Precursors

In view of the current situation wherein acid resources and valuable components in titanium dioxide waste cannot be effectively extracted are prone to secondary pollution, our research team proposed a new technique consisting step extraction comprehensive utilization acid. this paper, thermodynamics selective precipitation preparation doped iron phosphate from were studied. The results show that content Al3+, Mn2+, Mg2+, Ca2+ reaction system can tuned by adjusting pH during pre-precipitation process. first step, these impurity ions should settled as much possible; then, Fe2+ oxidized Fe3+ so obtain with higher purity next effects temperature, seed crystals, value, P/M on process investigated detail. experimental reduced state, optimal conditions temperature 75 °C, an initial value 4.5, molar ratio 1.1. 60 solution = 2.5, time 25 min. After calcination, precipitate mainly consists phosphate, which basically meets requirements precursor.