A method for producing magnesium metal is the use of bischofite (hydrous magnesium chloride). The main sources of bischofite are seawater, brines and salt lakes. Molten salt electrolysis of anhydrous magnesium chloride is usually used for the production of magnesium metal. Dehydration of hydrous magnesium chloride is carried out in presence of silica gel and calcium chloride at moderate temperatures. Effects of the ratio of silica gel to bischofite, temperature, and reaction time were studied. Analysis of dehydrated magnesium chloride was performed by FTIR and XRD. Results show that use of silica gel improves the drying process and allows the drying to take place at lower temperatures. The results showed that in the cold stage, ie, at ambient temperature and pressure, the separation of the silica gel / magnesium chloride ratio was 5 to 1, and 8.9% water, which was equivalent to a crystalline water molecule, for 24 hours. After that, the product of the cold stage in the vicinity of silica gel at the hot stage was investigated at160 and the remaining time of 18 hours and the ratio of silica gel to magnesium chloride, 5 to 1, 48.5% water equivalent to 4 molecules of crystallization water It is isolated due to the loss of a cold crystallization water molecule, the product of this process is magnesium chloride monohydrate. Keywords: Magnesium chloride,Bischofit,Dehydration,Silica gel,Calcium chloride
