production of magnesium from seawater
(i) Production of pure magnesium chloride from sea water or brine. Where sea-water is the raw material, it is treated with dolomite which has been converted to mixed oxides by heating to a high temperature. Magnesium hydroxide precipitates, while calcium hydroxide remains in solution.ses of magnesium. Magnesium is the third most used metal in construction (after iron and aluminium). Magnesium alloys, typically containing over 90% magnesium, have a very low density, comparatively high strength and excellent machinability.