The hexahydrate magnesium chloride is also known as a halogen sheet, the chemical formula MgCl2·6H2O, molecular weight: 203.3. Colorless crystals. Soluble in water and ethanol, it is easy to deliquesce when the humidity is high. 116~118 °C hot melt decomposition. It is mixed with magnesium oxide and water to form magnesium cement. Reacts with an alkali metal or alkaline earth metal hydroxide.
Appearance: light yellow or white flake, powdery, irregular grain
Properties: colorless and deliquescent crystal, highly soluble in water, usually with six molecules of crystal water, namely MgCI2.6H2O, but loses crystal water when heated to 95 ° C, begins to decompose at 135 ° C or higher, and releases Hydrogen chloride (HCI) odor, halogen flakes are colorless monoclinic crystals, industrial products tend to exhibit yellowish brown magnesium chloride containing about 30%-50% and also contain impurities such as magnesium sulfate chloride, which has bitter taste. Soluble in water and ethanol, it is easy to deliquesce at higher temperatures.
Product Classification
Magnesium chloride is divided into white film and slab according to product quality
. 1. White film mainly refers to magnesium chloride produced by acid process. The color is white, transparent, the solution is free of impurities, transparent, generally used for export, high quality, the content is generally around 47.
2. The film is a general name for the production process of the cauldron method. The appearance is generally milky white or brown. The main producing areas are in Haihua, Changyi, Binzhou and other places. Shouguanghou Town is the concentrated place for the production of magnesium chloride in small workshops. According to the quality of the product, the product is divided into a net piece, a sheet and a salt sheet. The net content is about 42-45, the film content is more than 30, and the salt tablets are generally 30 or less. The magnesium chloride produced by Houzhen generally does not reach the national standard.
Uses:
1. Metallurgical industry
The adhesive used to make refractory materials and furnace arm, and is the raw material for manufacturing No. 2 flux and smelting metal magnesium.
2, the chemical industry is
mainly used to make a variety of magnesium salts, such as magnesium oxide, magnesium hydroxide, magnesium carbonate, firecracker solids, also used as raw materials for antifreeze.
3, building materials
and diamond bituminous soil (MgO) made of hard corrosion-resistant magnesia cement, can be made into artificial marble, bitter tile, floor, ceiling, decorative board, fire board, greenhouse bracket, inorganic glass steel greenhouse skeleton, Magnesite insulated chicken house, wavy tile, ventilation duct, partition wall panel, magnesite manhole cover, bathtub, door and window frame and mobile home. Used as antifreeze in winter construction.
4, machinery industry In
daily life, the use of diamond bitter soil can be made into mechanical packaging boxes, triangular cushions and furniture, etc., is a good material for "materials by earth."
5. The food industry
is a protein coagulant. The tofu made with brine (food grade magnesium chloride aqueous solution) is more tough than the gypsum-made tofu, and is also used as an additive for some foods.
6. Transportation industry It is
used as road ice melting agent, which has fast ice making speed and less corrosiveness to vehicles, which is higher than sodium chloride.
7, medicine
with magnesium chloride made of "halogen dry" can be used for medicinal purposes.
8. Agriculture It
can be used to make magnesium fertilizer, potassium magnesium fertilizer and cotton defoliant.
In addition, it can also be used as a coal mine fire retardant, road dustproofing agent, and stable soil.
