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A new process is presented for producing metallic magnesium from seawater. Ion exchange is used to selectively extract Mg2+ from seawater, without introducing Na+ and K+ impurities into the product Mg. The magnesium extracted from the resin is reacted with CaO and precipitates on the surface of fine ferrosilicon suspension to produce a Mg(OH)2-Ca(OH)2-FeSi solids cake, which, after further wash and...
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