Precipitation of iron (III) using magnesium oxide in fluidized bed
DOI:
https://doi.org/10.3989/revmetalm.2006.v42.i4.26Keywords:
Precipitation, Fluidized bed, Magnesium oxide, Wastewater treatment, Iron removalAbstract
A process for iron (III) removal by hydroxide precipitation from an acid synthetic inorganic effluent using magnesium oxide as an alternative precipitant agent in a fluidized bed was developed. An acid synthetic inorganic effluent containing 100 and 200 mg/l of ferric ions (pH = 1.0) was continuously fed up to the acrylic column (30 cm high and 2 cm diameter) during 180 minutes. Magnesium oxide pulp (3% v/v) was injected at the beginning of the experiment in order to allow the iron hydroxides precipitation. The concentration and pH profiles agreed in their curves, while the pH profile rose, the concentration profile decreased and a high percentage of iron removal (higher to 99%) was reached. Extremely low iron concentrations have been reached, thus permitting to attend to the environmental standard of 10.0 mg/l for discharge of effluent containing ferric ions established by the law DN 10/86 of COPAM (Conselho de Política Ambiental do Estado de Minas Gerais-Brazil).
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