Abstract
The purification of wastewater containing dissolved metal ions by in situ precipitation gives rise to a sludge composed mainly of ferrites MeXFe3-xO4 (where Me represents the existing metal ions in the wastewater). Oxides, iron oxy-hydroxides and other impurities are also present in the sludge in smaller proportion. The present investigation proposes magnetic separation of the sludge to recover the ferrites for their possible re-use. Under optimum operating conditions of the magnetic separator, a recovery efficiency of the magnetic fraction in excess of 99% and a high degree of selectivity were obtained.
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