Basic information of
magnesium chloride hexahydrate known halogen flake, the 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 magnesia and water to form magnesium cement. It reacts with an alkali metal or alkaline earth metal hydroxide.
Appearance: light yellow or white flake, powdery, irregular granular
Properties: colorless and deliquescent crystal, highly soluble in water, usually with six molecules of crystal water, namely MgCI2.6H2O, but heated to 95 At °C, the crystal water is lost. When it is above 135 °C, it begins to decompose and releases hydrogen chloride (HCI) odor. The halogen sheet is colorless monoclinic crystal. The industrial product tends to have a yellow-brown magnesium chloride content of about 30%-50% and also contains magnesium sulfate. Impurities such as compounds, have a bitter taste. Soluble in water and ethanol, it is easy to deliquesce at higher temperatures
Categories
chloride by product quality is divided into white film, sheet P
1 refers to the process for producing a white film is mainly an acid chloride method, the color white, transparent solution free of impurities, a transparent, generally used for export, high-quality, content is generally about 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 less than 30. Hou Zhensheng producing magnesium chloride generally are lower than the
feed process: natural halide crystals (Qinghai) and industrial preparation of magnesium chloride
hexahydrate and anhydrous powder has
a temperature of 20-30 deg.] C to dissolve the magnesium chloride hexahydrate
anhydrous magnesium chloride was dissolved at 90 -120 °C
Packaging
regular packing: 25kg (foreign multi-use) 50kg (multi-domestic use) or ask in English packaging, general packaging neutral English
Implementation of quality standards
of industrial magnesium chloride execute QB / T2605-2003 "industrial-grade magnesium chloride standard"
Note: only industrial enterprise standards, there is no national standard
food additive magnesium chloride implementation of the national standard GB25584-2010 "national food safety standards."
Acid magnesium chloride ph value 6-8
Magnesium chloride production process
1 seawater desalination method
2 large equipment soil method tanning
3 small workshop soil
method tanning 4 acid method (hydrochloric acid and magnesium chloride reaction)
magnesium chloride production process is divided into acid method and cauldron tanning method, as well as natural in Qinghai area The halogen
acid method is prepared by reacting hydrochloric acid and magnesium oxide. At present, the manufacturers of Tai'an and Weifang areas are
divided into large equipment and earthenware. The large equipment manufacturers mainly include Haihua, Changyilian. The sea and the innocent ones in Binzhou are mainly in the Houzhen
area. The natural halogen crystals in Qinghai are directly mined from the underground. The quality is relatively good and can be processed into food grade.
Common flake
1 saturated brine (sodium chloride, magnesium chloride, potassium chloride total concentration of 27) after four-effect evaporation of sodium chloride (refined salt)
2 continued heating and evaporation, potassium extraction
3 evaporation of magnesium sulfate
4 purified brine Introduced into the tablet machine, cooled and prepared to obtain the finished magnesium chloride
Supplement
1 One of the main raw material brines is seawater, which directly purifies magnesium chloride from seawater. It requires large equipment such as Jinsheng Marine Tianjin Yihua and Sanhua. Some factories in Lianyungang
2 use underground salt water.
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 insulation chicken house, corrugated 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 from 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 a road ice melting agent, which has a fast ice-making speed and is less corrosive to vehicles and higher than sodium chloride.
7. Agriculture It
can be used as 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.
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