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What Is The Difference Between Metallic Silicon 441 And 553?

As an additive to non-iron-based alloys, metallic silicon is widely used in the steelmaking industry. So where is metallic silicon specifically used?

What is the difference between metallic silicon 553 and 441? Let’s learn more about it below.

Metallic silicon, also known as crystalline silicon or industrial silicon, is mainly used as an additive for non-iron-based alloys. Metallic silicon is a product smelted from quartz and coke in an electric furnace.

The main component silicon content is about 98%, and the remaining impurities are iron, aluminum, calcium, etc.

In our country, metallic silicon is usually classified according to the content of its three main impurities: iron, aluminum, and calcium.

According to the percentage content of iron, aluminum, and calcium in metallic silicon, metallic silicon can be divided into different grades such as 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, and 1101. In each grade, the first and second codes represent the percentage content of iron and aluminum, and the third and fourth digits represent the calcium content, so 553 represents the content of iron, aluminum and calcium in metallic silicon, which is 0.5% and 0.5%. %, 0.3%; 441 represents the content of iron, aluminum and calcium in metallic silicon is 0.4%, 0.4%, 0.1%

It can be seen that the difference between 441 and 553 is the difference in purity. The silicon content of 553 is ≥98.7%, while the silicon content of 441 is ≥99.1%.

Specifically, industrial silicon is obtained by the high-temperature reaction of quartz and carbon in a submerged furnace. SIO2+C=SI+CO2.

Quartz can be of poor quality or good quality, and carbon as a reducing agent can also be of poor quality or good quality. The difference in these raw materials determines the purity of industrial silicon. From a cost perspective, obviously the higher the quality of the raw materials, the more expensive they will be.