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This work presents chemical modeling of solubilities of metal sulfates in aqueous solutions of sulfuric acid at high temperatures. Calculations were compared with experimental solubility measurements of hematite (Fe 2 O 3 ) in aqueous ternary and quaternary systems of H 2 SO 4 , MgSO 4 and Al 2 (SO 4 ) 3 at high temperatures. A hybrid...