One. The basic information of 
magnesium chloride hexahydrate, 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 flaky, powdery, irregular granular 
Properties: colorless and deliquescent crystals, highly soluble in water, usually with six molecules of water of crystallization, ie MgCI2.6H2O, but heated to 95 ° C When it loses crystal water, it begins to decompose at 135 ° C or higher and releases hydrogen chloride (HCI) odor. Magnesium chloride hexahydrate is a colorless monoclinic crystal. Industrial products tend to have a yellow-brown magnesium chloride content of about 30%-50% and also contain magnesium sulfate. Impurities such as compounds, have a bitter taste. Soluble in water and ethanol, it is easy to deliquesce at higher temperature. 
Second, product classification 
Magnesium chloride is generally divided into anhydrous magnesium chloride and magnesium chloride hexahydrate. 
Magnesium chloride is further classified into industrial grade magnesium chloride and food grade magnesium chloride according to Uses. 
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 of large pots and simmering methods. Appearance is generally milky white or brown. The main producing areas are in Haihua, Changyi, Binzhou and other places. Shouguanghou Town is a concentrated place for the production of magnesium chloride in small workshops. Quality divides the product 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. 

Raw material process: natural halogen crystal (Qinghai) and industrial preparation of magnesium chloride 
hexahydrate and anhydrous powdered 
hexahydrate magnesium chloride dissolved temperature 20-30 ° C
After the anhydrous magnesium chloride is dissolved, the temperature is 90-120 °C. 
3. 
Packing: 25kg (for foreign use) 50kg (for domestic use), medium or English packaging, generally used in English neutral packaging 
flower packaging: other chemical products Recycling of discarded bags after use of fertilizers and feeds 
Remarks: Flower packaging is generally 5-20 per ton cheaper than bags packed with magnesium chloride hexahydrate (not necessarily) 
4. Performing quality standards for 
industrial magnesium chloride QB/T2605-2003 Industrial grade magnesium chloride standard 
Note: Industrial grade only enterprise standard, no national standard 
food additive magnesium chloride implementation of national standard GB25584-2010 "food national safety standard" 
acid method magnesium chloride ph value 6-8 
five, magnesium chloride production process 
1 seawater desalination method 
2 large equipment soil method brewed 
3 indigenous small workshops brewed 
4 acid method (hydrochloric acid and magnesium chloride) 
chloride acid method into the production process and method brewed cauldron, there is a natural halide crystals in Qinghai 
acid method is the reaction with hydrochloric acid and magnesium oxide obtained, the current manufacturers have Tai'an and Weifang home 
cauldron boil Act is divided into large indigenous brewed equipment and large equipment manufacturers are Haihua, Changyi even without sea and Binzhou In a factory, indigenous brewed Hou town areas mainly 
natural halide crystal Qinghai area directly from the underground mining digging up, better quality, processed into food grade 
Pu sheet process 
a saturated brine (sodium chloride, magnesium The total concentration of potassium chloride reaches 27). After four-effect evaporation, sodium chloride (refined salt) is precipitated.
2 heating was continued evaporated to afford potassium 
3 over magnesium sulfate and evaporated to precipitate 
the brine introduced into the purified 4 tableting machine, cooling the producer to obtain refined magnesium 
supplement 
1, wherein the main raw material with some brine water, sea water directly from the purified magnesium chloride requires a large equipment such as Jinsheng Marine Tianjin Yihua, Sanhua, 
another plant in Lianyungang 2 another underground brine, the color should be light 
six, Uses 
1, the metallurgical industry 
used to make refractory materials and the arm of the furnace arm, and is the manufacture of No. 2 flux and Raw materials for smelting magnesium metal. 
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, in the 
daily life of the machinery industry , the use of diamond bitum soil can be made into mechanical packaging boxes, triangular cushions and furniture, etc., is a good material for "materials by the soil." 
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. The transportation industry is 
used as a road ice melting agent, which has a fast ice-making speed and is less corrosive to vehicles, higher than sodium chloride. 
7. Medicine
It is medicinal to make "halogen dry" with magnesium chloride. 
8, agriculture 
can be used to make magnesium fertilizer, potassium magnesium fertilizer and cotton defoliants. 
In addition, it can also be used as a coal mine fire retardant, road dustproofing agent, and stable soil.