Magnetic separation of ferrite sludge from a wastewater purification process

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作者：
Department of Inorganic Chemistry, Faculty of Sciences, University of Valladolid, 47005 Valladolid, Spain [1 ]
不详 [2 ]
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来源：
Water Air Soil Pollut. | / 1-4卷 / 385-394期
关键词：
Ferrites - Impurities - Iron oxides - Magnetic separation - Precipitation (chemical) - Purification - Sewage sludge;
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摘要：
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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