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Abstract
Abstract A recently developed process for the treatment of zinc leach residue involves dissolution in aqueous sulphuric acid. Soluble ferric ion is then hydrolyzed from the acidic solution either as jarosite or as hematite. depending on the temperature and the acid concentration.Accordingly, experiments have been carried out to define conditions under which hematite is formed. The following results are presented and discussed. (1) Solubilities of ferric oxide in dilute sulphuric acid at temperatures from 150°C to 200°C were determined. (2) The hydrolysis of ferric sulphate proceeds in one of three ways, depending on the acidity of the solution. (3) In the hydrolysis of ferric sulphate solution at 200°C in the absence of zinc sulphate, Fe2O3 is stable below 60 gil H2SO4, and FeOHSO4 is stable above 60 g/l H2SO4. (4) When ZnSO4 or CUSO4 is added to the solution, Fe2O3 is stable over a wider range of acid con...
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