Magnesium can be burned directly in nitrogen without oxygen
What is magnesium nitride？
The chemical formula of the ionic compound magnesium nitride is Mg3N2, which is an inorganic compound composed of nitrogen and magnesium. Belongs to the cubic crystal system. It is off-white. Magnesium nitride, like many metal nitrides, will react with water to produce ammonia, which can decompose acid, slightly replace ethanol and connect in series. To prepare magnesium nitride, the magnesium belt can be burned in nitrogen. Often used as a catalyst.
What is magnesium nitride used for？
1. It is used as a catalyst when preparing nitrides of other elements with high hardness, high thermal conductivity, corrosion resistance, wear resistance and high temperature resistance. When cubic boron nitride was successfully synthesized for the first time, the catalyst used was magnesium nitride.
2. Additives used in high-strength steel smelting. Magnesium nitride (Mg3N2
) replaces desulfurized magnesium in construction steel smelting, which is beneficial to improve the density, strength, tensile strength and endurance of steel. In addition, the use of magnesium nitride (Mg3N2) for desulfurization can reduce other additives in an appropriate amount, thereby helping to reduce the production cost of construction steel.
3. Preparation of special ceramic materials.
4. Manufacturing special alloy foaming agent.
5. Used to make special glass.
6. Catalyze polymer cross-linking.
7. Recycling of nuclear waste.
8. Used as a catalyst material for synthetic diamond synthesis and cubic boron nitride.
How to prepare magnesium nitride？
To prepare magnesium nitride, the magnesium belt can be burned in nitrogen. If the nitrogen is not pure, it is easy to produce products containing magnesium oxide. The method of reaction in dry NH3 gas is better.
Place the magnesium scraps in a porcelain boat or a sintered magnesia boat. The boat is installed in a porcelain tube. One end of the porcelain tube is connected to a T-shaped tube. One end of the T-shaped tube can be filled with dry ammonia gas and the other end can be filled with nitrogen. The end of the porcelain tube is connected to a U-shaped tube, and the tube is filled with desiccant, half of which is small flakes of CaO, and the other half is small flakes of KOH. The gas discharged from the reaction tube is absorbed by the absorption device, which is two conical flasks containing dilute sulfuric acid. In order to prevent back suction, do not insert the tube of the first absorption bottle below the surface of the dilute sulfuric acid.
Pour dry NH3 and N2 into the porcelain tube until the second absorption bottle no longer emits bubbles, indicating that the air in the porcelain tube has been purged. Raise the temperature to 800～850℃, heat the magnesium powder for 4 hours, the magnesium powder becomes hot, marking the beginning of the reaction, and at the same time H2 must be produced. During the reaction, the pressure of NH3 should be greater than the outside atmospheric pressure to avoid sucking back. When the reaction is over, turn off NH3, keep the original temperature and continue to pass N2 for 1.5h to remove NH3·Mg3N2 adsorbed on Mg3N2, which is very deliquescent and must be stored in a dry container.
If the magnesium belt is burned in the air, in addition to magnesium oxide, some magnesium nitride will also be produced.
Why does burning magnesium react with nitrogen?
It shows that when magnesium and oxygen are combined together, the energy of the magnesium oxide product is lower than that of the reactant. The heat is so great that magnesium can also react with nitrogen and carbon dioxide, which are usually very inactive.
How to store and transport magnesium nitride？
Because magnesium nitride is easily combined with water (H2O) to decompose, it needs to be stored in a vacuum sealed, waterproof and moisture-proof.
Slightly harmful to water bodies, do not expose undiluted or large amounts of products to groundwater, waterways or sewage systems, and do not discharge materials into the surrounding environment without government permission.
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