LAUSR

The mother solution of high purity ferric sulfate can be extracted by water washing, acid leaching, high-temperature aging, water leaching and removing K, Ca and Si elements with high content in sintering dust with sintering dust as raw material. Under the optimal acid leaching scheme, the leaching rate of Fe element can reach 99.8%. Subsequently, the mother solution of high purity ferric sulfate was configured to 100 ml 3 mol L−1 Fe2(SO4)3, and then add 0.1 mol FeSO4.7H2O, mixing reaction 1 h at room temperature, the liquid polyferric sulfate product can be just made. Then the liquid polyferric sulfate can be dried to SPFS product with the 17.4% base degrees at 50 °C. Through the comparison and analysis of TG, DTG and IR test results of purchased SPFS and self-made SPFS, it can be concluded that the self-made SPFS has the similar hydroxyl bridged frame structure with that of purchased SPFS. The experiment of purifying different kinds of simulated dye wastewater with self-made SPFS shows that the optimal pH range of these three dyes is 5–9 in the dye wastewater decolorization experiment and all their chrominance removal rates can reach above 96% at pH = 7.0. In addition, the adsorption isotherm of orange GGL solution is well represented by the Langmuir isotherm model in this experiment.