Details Of Ferro Silicon Nitride

Ferrosilicon nitride can be divided into two categories according to its use: ferrosilicon nitride for refractory materials and ferrosilicon nitride for steelmaking. Powdered ferrosilicon nitride (see Fig. 1) is mainly used in the plugging mud of large blast furnaces, and a small amount is used in trench materials or other amorphous refractory materials. Granular ferrosilicon nitride (see Figure 2) is mainly used for oriented silicon steel or other steel grades that use nitride to improve strength (such as HRB400 steel bar).

According to its characteristics, ferrosilicon nitride for steelmaking can be divided into: ordinary ferrosilicon nitride for steelmaking and high-purity ferrosilicon nitride for steelmaking. According to its characteristics, ferrosilicon nitride for refractory materials can be divided into: ordinary ferrosilicon nitride for refractory materials and high-purity ferrosilicon nitride for refractory materials.

2. Application in refractory materials

①Al2O3-SiC-C 

Ferrosilicon nitride is widely used in Al2O3-SiC-C gun mud, iron hook material and refractory bricks. In particular, it is widely used in blast furnace mud in developed countries, which significantly improves the opening and blocking performance of blast furnace mud, meets the needs of blast furnace tapping, and becomes an indispensable part of modern large blast furnace mud. Adding a small amount of ferrosilicon nitride to the iron groove material can greatly increase the iron flux of the iron groove, and Japan began to adopt this method in the 70s of the last century.

The domestic application of ferrosilicon nitride is relatively short. In 1994, Baosteel first added silicon nitride to blast furnace clay, which improved the performance of clay and met the needs of ironmaking production. Since the price of ferrosilicon nitride is only one-half of that of silicon nitride, and the two are basically close in terms of performance, in recent years, domestic key large-scale iron and steel enterprises have basically used ferrosilicon nitride in blast furnace plug mud of more than 2000M3. The clay with ferrosilicon nitride can well meet the needs of large blast furnaces, so that the number of blast furnace tapping times is generally reduced from 18 times to 12 times, and the lowest time is reduced to 6 times. The consumption of clay has been reduced from 1.2 kg/t iron to 0.5 kg/t iron.

②Fe-Si3N4-SiC compound materials

Si3N4-SiC material has good physical and chemical properties, especially high-temperature properties, and is widely used in high-temperature fields such as blast furnaces and aluminum electrolytic cells, and has a good application effect. Compared with pure silicon nitride, ferrosilicon nitride has better sintering properties and can be used as a high-temperature binding phase. Fe-Si3N4-SiC composites not only contain high-temperature reinforcing phase SiC and silicon nitride, but also metal plastic phase (Fe, FeSi or Fe3Si), which can improve the thermal shock resistance of the material and have a good application prospect in the high-temperature field.

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