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http://dx.doi.org/10.7844/kirr.2016.25.4.32

Precipitation of Magnesium Sulfate from Concentrated Magnesium Solution for Recovery of Magnesium in Seawater  

Cho, Taeyeon (Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University)
Kim, Myoung-Jin (Department of Environmental Engineering, Korea Maritime and Ocean University)
Publication Information
Resources Recycling / v.25, no.4, 2016 , pp. 32-41 More about this Journal
Abstract
The precipitation test, which is the last step of magnesium recovery process consisting of three processes (pre-precipitation, selective dissolution of magnesium, precipitation) is performed to obtain magnesium sulfate powder from seawater. In the study, we succeed in precipitating the magnesium sulfate by adding acetone into the solution of magnesium over 4 times concentrated from seawater. The yield efficiency of magnesium sulfate increases with increasing pH and the ratio of added acetone. More than 99% of magnesium is obtained as magnesium sulfate hydrate ($MgSO_4{\cdot}6H_2O$) under the following conditions; pH 1.0 ~ 1.5, and the ratio of solution and acetone 1 : 1.5 (v:v). The acetone used in the precipitation process is recovered by the fractional distillation.
Keywords
Mg; seawater; precipitation; magnesium sulfate; acetone;
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Times Cited By KSCI : 3  (Citation Analysis)
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