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Battery grade iron phosphate was prepared through three processes of nitric acid dissolution, coprecipitation and calcination. In the first stage, iron phosphate slag was dissolved with strong oxidizing acid to obtain iron phosphate solution containing iron and phosphorus. In the second stage, the pH value of iron phosphate solution was adjusted by ammonia water to make the solution precipitate into iron phosphate. In the third stage, the final product anhydrous iron phosphate was obtained through calcination. The calcined products were evaluated by XRD, SEM, particle size distribution and molar ratio of iron to phosphorus. The process research shows that the best process conditions in the first stage are solid-liquid ratio 1∶12, nitric acid concentration 7.6 mol/L, dissolution time 5 h, dissolution temperature 90 ℃,under which the dissolution rate of ferrophosphorus slag is 96.39%. The optimum technological conditions in the second stage are the molar ratio of iron and phosphorus in the solution is 1∶1, the reaction temperature is 80 ℃, pH=1.0, time is 4 h, and the molar ratio of iron and phosphorus in the prepared FePO4 is 0.97. The optimum calcination temperature is 500 ℃,and qualified iron phosphate is prepared. [ABSTRACT FROM AUTHOR]

The purilication and reuse ol titanium dioxide by-product lerrous sullate are ol great signilicance lor improving the added value ol the iron-containing products and the comprehensive utilization of resources. The removal ol manganese and the reuse of iron in titanium dioxide by-product lerrous sullate were studied. The leasibility ol oxidizing Fe2+ to Fe'十 by hydrogen peroxide and oxidizing Mn2+ to Mn02 by potassium permanganate was theoretically analyzed. The effects ol oxidant dosage, pH value ol the solution and reaction time on the removal rate ol manganese were investigated. The experimental results show that the manganese removal rate could reach 99. 9% under the conditions ol KMnO4 dosage 1. 0 times ol the theoretical value, pH value ol 1. 20 and oxide reaction time lor 30 min. The manganese content in the purified ferric sullate solution was reduced to 0. 28 mg/L alter manganese removal treatment The purified solution was used as the iron source to synthesize iron phosphate by liquid-phase precipitation method, and the nanoscale high-purity amorphous iron phosphate dihydrate precursor was obtained, which can be transformed into a-quartz-type iron phosphate alter calcination. [ABSTRACT FROM AUTHOR]