The magnesium silicide method uses a magnesium silicate powder and ammonium chloride to chemically react in a liquid ammonia environment to prepare a silane. Magnesium silicide method, also known as Komatsu method, is the world's first industrialized silane preparation technology, and is one of the most mature preparation technologies in China. Due to the high cost, the process has not yet developed a production scale of 100 tons. Its chemical reaction equation is:

Mg2Si + NH4CL------ MgCL2·6NH3 + SiH4

The production process of the process includes the synthesis of magnesium silicide, silane synthesis, molecular sieve adsorption, ammonia tail gas absorption, etc.; the reaction raw materials are mainly silicon powder, magnesium powder and ammonium chloride, ammonia water, etc. These raw materials are abundant in supply and relatively inexpensive. At the same time, the process is simple to operate, and the temperature (-20 ° C) and pressure (0.2 MPA) are easily achieved;

However, the shortcomings of this technology are also obvious.
First, if the drying of ammonium chloride is not complete, it will greatly affect the yield of silane. At the same time, since the magnesium powder is easily chemically reacted with ammonia gas, the drying of the magnesium powder and the ammonium chloride is extremely strict with the environment, and the cost is invisibly increased.

Secondly, the large amount of by-product hexaammonium chloride produced by the reaction is not easily recovered and utilized.

Again, since the reaction is carried out in a liquid ammonia environment, the liquid ammonia consumption is large, all of which increase the production cost, and the requirements for the treatment of the three wastes are high. Moreover, the single scale of the magnesium silicide method is not easy to be large, and is suitable for small-scale production.