Abstract
Pickling waste waters are listed as hazardous wastes in most industrialized countries, mainly due to their corrosive properties and also to their content of ferrous iron and sulphuric acid. In the present work the recovery of iron and sulphuric acid from these wastes has been attained. Iron was recovered by means of the precipitation of basic sulphates (ammoniojarosite and feOHSO 4). The relationship between the ferric hydroxysulphates in the precipitate as a function of heating time was studied. Solids were characterized by XRD and FTIR SEM/TEM techniques. Thermal decomposition studies of the solids were made.
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