Magnesium fluoride

Editing of physical and chemical properties

Magnesium fluoride (MgF2) is a colorless quadrilateral crystal or powder, rutile lattice. Tasteless, insoluble in water and alcohol, slightly soluble in dilute acid, soluble in nitric acid. The relative density is 3.18, the melting point is 1248 ℃, and the boiling point is 2,260 ℃. Under the electric light heating is weak purple fluorescence, its crystal has a good polarization effect, especially suitable for ultraviolet and infrared spectroscopy. is toxic.

Magnesium fluoride is an ionic compound containing only ionic bonds, which reacts with the accruing oxidizer, and the addition of nitric acid can dissolve it. The chemical equations are:

MgF2+2HNO3==Mg (NO3) 2+2HF

Storage editing

Keep the reservoir sealed and can be served in glass bottles.

Put in a tight storage device and store in a cool, dry place.

Preparation or source editing

1, by magnesite (magnesium carbonate) and excessive hydrofluoric acid under the 90~95°C reaction, and then by filtration, washing, drying, crushing to obtain magnesium fluoride finished products.

In the polyethylene beaker, the 50g 46% hydrofluoric acid is loaded and the hydrofluoric acid is diluted to 25% by adding 42g water. Place the beaker in the ice water bath to cool, while stirring edge to add 48g magnesium carbonate, that is, magnesium fluoride precipitation produced, after dehydration, in 400 ℃ drying, the resulting magnesium fluoride 35g.

2, by the reaction of magnesium oxide and ammonium fluoride, other complex decomposition reaction can also be.

MgO + (NH4) Hf2→mgf2+ NH3+ H2O

Usage editing

1, used as the smelting of magnesium metal flux, electrolytic aluminum additives;

2, used as a spectral reagent;

3, the manufacture of ceramics, glass and smelting magnesium, aluminum metal flux, optical instruments in the lens and filter coating.

Toxicity & amp; protection editing

Although the chemical properties of magnesium fluoride are very stable, heating will not decompose, even strong electrolysis is difficult to separate, so generally no harm to the human body, but long-term contact will also cause certain harm to the human body, such as: causing fluorosis teeth and fluorosis. Direct oral administration of magnesium fluoride can cause salivation, nausea, vomiting, diarrhea and abdominal pain, followed by tremors and coma, which can lead to death from respiratory paralysis.