Food grade and industrial grade anhydrous magnesium chloride:
At present, dehydration methods used in the production of anhydrous magnesium chloride are: (1) hydrogen chloride dehydration method; (2) formation of double salt dehydration method; (3) dehydration by forming complex.
6. The physical and chemical properties and uses of magnesium chloride hydrate, magnesium chloride dihydrate and anhydrous magnesium chloride are as follows:
Anhydrous magnesium chloride is a white and glossy hexagonal crystal. Its melting point is 714 ºC and boiling point is 1412 ºC. It has strong deliquescence, higher than that of magnesium chloride 6H2O and magnesium chloride 2H2O. The physical and chemical properties are basically the same as that of magnesium chloride 6H2O. Mainly used in the production of magnesium and chemical, light industry, coal, construction and other sectors.
1. Metallurgical industry:
It is used as binder for refractory and furnace arm. It is also used as raw material for No.2 flux and magnesium smelting.
2. Chemical industry:
It is mainly used to make various magnesium salts, such as magnesium oxide, magnesium hydroxide, magnesium carbonate, firecracker fixative and antifreeze.
3. Building materials:
It is made of magnesia cement and magnesia, which is hard and corrosion-resistant. It can be made into marble, magnesia tile, floor, ceiling, decorative board, fireproof board, greenhouse bracket, partition board, magnesia well cover, bathtub, door and window frame, movable house, etc.
4. Machinery Industry:
In daily life, it can be made into mechanical packing box, triangular cushion edge and furniture, which is a good material of "replacing material with soil".
5. Food industry:
The bean curd made from brine (magnesium chloride solution) is more tender and delicious than that made from stone. It can also be used as an additive in some foods.
6. Transportation industry:
It can be used as road deicing and snow melting agent with high deicing speed and low corrosiveness to vehicles, which is higher than sodium chloride.
7. Medicine:
It can be used as medicine.
8. Agriculture:
It can be used as magnesium fertilizer, potassium magnesium fertilizer and cotton defoliant. Advantages and application methods of anhydrous magnesium chloride for magnesite products in MAGNESITE Building Materials Industry:
Anhydrous magnesium chloride, an industrial by-product, usually contains 92% - 99.9%.
1. Using 99% magnesium chloride as raw material to produce magnesite products, because of high purity and less impurities, it is easy to control the phenomenon of frosting, halogen returning and deformation. The prepared brine is clear and transparent, which is formed by hydrolysis reaction in the process of preparing brine. Anhydrous magnesium chloride can raise the brine temperature by 80 ~ 100 ºC, and can be reused when the temperature is reduced to 40 ºC. It can shorten the dehydration and solidification time of magnesite products, especially when the temperature is low. Because the price is lower than that of brine, the cost of transportation, loading, unloading and storage can be reduced.
2. When mixing brine, add water first and then add it. The product should be added 4-5 times step by step, once every 30 minutes (in order to reduce the temperature of brine). At the same time with stirring, so as to avoid hot water splashing scald, dissolution time than the traditional halogen appropriate to extend 2-3 hours.
3. The bittern prepared with 99% magnesium chloride has high purity, which can be reduced by more than 2-5 degrees compared with the traditional magnesium chloride hexahydrate.
4. Theoretical dosage comparison: 1000 kg brine tablets (43%) is used = 430 kg 99% magnesium chloride is used. 1000 kg of brine tablets (47%) is used = 470 kg of 99% magnesium chloride is used.
5. Comparison of actual dosage: 1000 kg 99% magnesium chloride = 2500 kg brine tablets (43%). 1000 kg 99% magnesium chloride = 2400 kg brine tablets (47%).
It is necessary to know the production process of anhydrous magnesium chloride, such as NaCl, KCl, SO4 & sup2& macr; If there are few or no harmful ingredients, it is most suitable for magnesite products. For example, anhydrous magnesium chloride, a by-product of replacing titanium with magnesium, usually contains no or very few of the above harmful components. Using high purity anhydrous magnesium chloride, such as 99%, we can directly use Baume meter to measure the concentration of brine, which can be used to guide production. On the other hand, the cost of using high purity anhydrous magnesium chloride is very high. It is usually tested according to the following standards according to the source and use of raw materials:
GB / T 8453-87 industrial magnesium chloride (national standard)
Industrial magnesium chloride (instead of: 3706-1999) (standard of Ministry of light industry)
WB / T 1018-2002 industrial magnesium chloride for magnesite products (standard of material department)
GB / T 25584-2010 food additive magnesium chloride
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