Iron removal behavior and mechanism of oxygen pressure hydrothermal enhanced goethite method in ZnSO4-FeSO4 solution
In order to solve the problems such as the low efficiency of zinc-iron separation and poor performance of iron residues in the process of zinc hydrometallurgy,this paper proposed a method for iron removal using goethite method in an oxygen pressure hydrothermal environment.The results indicate that increasing reaction temperature,oxygen partial pressure,stirring speed,seed addition and pH are all beneficial for iron removal.Under the optimized reaction conditions with a reaction temperature of 110 ℃ and an oxygen partial pressure of 0.2 MPa,the contents (mass fraction) of iron,zinc and sulfur in iron precipitate product are 55.2％,3.2％ and 1.5％,respectively.The iron crystal clusters with high crystallinity are formed in iron precipitate product.During the oxygen pressure hydrothermal iron removal process,the iron removal reaction at the time from 0 min to 60 min follows the first order reaction kinetics characteristics,and then follows the second order reaction kinetics characteristics at the time from 60 min to 100 min.The activation energy of the iron removal reaction is 34.50 kJ/mol,and the rate constant(k) of the iron removal reaction is 0.021 dm3/(mol·min) at 110 ℃.
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