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Physical and Chemical Indices of Magnesium Chloride Hexahydrate and Storage Problems


1. The physical and chemical indexes of magnesium chloride hexahydrate

The white crystals of magnesium chloride hexahydrate are columnar or needle-like, with a bitter taste. The pure product is a colorless monoclinic crystal. Industrial products are often yellowish brown, containing about 40-50% magnesium chloride, and also contain impurities such as magnesium sulfate and chloride, and have a bitter and astringent taste. It is easily soluble in water and ethanol, and it is easy to deliquesce when the humidity is high. It can be decomposed by hot melting at 116~118℃.   

Magnesium chloride hexahydrate is mixed with magnesium oxide and water to form magnesium cement: MgCl2·6H2O+3MgO+4H2O→MgO·MgCl2·10H2O.  

Magnesium chloride hexahydrate reacts with alkali metal or alkaline earth metal hydroxide to produce magnesium hydroxide precipitation, and then heating to produce heavy magnesium oxide, MgCl2·6H2O+Ca(OH)2→Mg(OH)2+CaCl2+6H2O, Mg( OH)2→MgO(heavy)+H2O.

Add CO2 to the MgCl2 aqueous solution to generate magnesium bicarbonate and dissolve it, and then heat it at 80-90°C to generate basic magnesium carbonate.

Magnesium chloride hexahydrate reacts with sodium silicate to form magnesium silicate precipitation; it reacts with phosphoric acid or sodium phosphate to form magnesium phosphate precipitation.

2. The storage problem of magnesium chloride hexahydrate

When we store magnesium chloride hexahydrate, what aspects should we pay attention to?

1. Sealing: It is best to use two bags for better sealing. Pay attention to tightly sealing.

2. Marking: After sealing, use pigments that are not easy to be colored to indicate the detailed information of the product, such as batch number, product name.

3. Storage: Store in a dry warehouse. If temporarily stored, cover something to prevent the product from getting wet.

4. Transportation: During transportation, the tools must be clean and have a certain cover.