Dow Seawater
Dow Seawater : A process for extracting magnesium from seawater. Calcined dolomite (CaO+MgO, dololime), or calcined oyster shell, is added to seawater, precipitating magnesium hydroxide. This is flocculated, sedimented, and filtered off. For use as a refractory it is calcined; for the manufacture of magnesium chloride for the manufacture of magnesium metal, it is dissolved in hydrochloric acid