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Calcium nitride is a compound with the formula Ca3N2. It is produced by heating calcium nitrate in a stream of nitrogen.

The calcium nitride is black when the temperature is around 350 degC, milky white at 350 to 1150 degC or golden yellow when the temperature is above 1150 degC. It is a chemical reagent and used in the production of light-emitting diode (LED) phosphors.

Synthesis of Calcium Nitride

Traditionally, calcium nitride is obtained by bisublimation. This is a reaction between pure calcium and nitrogen in an electric furnace. It is characterized by a very low weight increase at an initial stage and by a very stable formation of dark blue nitride with metallic lustre that slows down the kinetics of the reaction.

This process is particularly suitable for the synthesis of large quantities of the compound. It can also be applied to the synthesis of melamine, urea and certain cyanide salts.

A device 1 enabling the synthesis of calcium nitride according to claim 3 includes a tank 18 equipped with heating means 17 designed to keep the zinc-calcium alloy 18 molten in the tank 16. The latter is transferred via a feed pipe 3 to a furnace 4 in which it is heated to and/or kept at a preset, temperature, greater than or equal to its melting temperature.

The zinc-calcium alloy is then sprayed in the form of fine droplets propelled by a jet of pressurized nitrogen heated to a temperature close to that of the molten and sprayed zinc-calcium alloy. The reaction in the reactor 6 can be observed through a transparent observation port 35 arranged near the sprayer 33.