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Preparation of Magnesium Nitride

wallpapers News 2021-06-10
Magnesium powder reacts with nitrogen at high temperatures to produce magnesium nitride. In the above reaction, if the nitrogen is not pure, products containing magnesium oxide are easily formed. 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. To prevent back suction, do not insert the tube of the first absorption bottle below the surface of the diluted sulfuric acid. Pour dry NH3 and N2 gas 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 N21.5h to remove the NH3·Mg3N2 adsorbed on Mg3N2. Mg3N2 must be stored in a dry container.
 
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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Tag: Magnesium   nitride