97 silicon and metallic silicon have significant differences in composition, structure and properties: the main difference between 97 silicon and metallic silicon is their composition, structure and properties. 97 Silicon mainly contains silicon dioxide, and metallic silicon mainly contains silicon. In terms of physical properties, metallic silicon has electrical and thermal conductivity, while silicon has semiconductor properties. Chemically, metallic silicon can react with oxygen at high temperatures, while silicon generally does not react with oxygen.
Industry classification:
97 Silicon belongs to high silicon ferro silicon, which belongs to ferro alloy industry; Metallic silicon belongs to the class of silicon elemental products and belongs to the nonferrous industry.
Naming method:
97 Silicon is named after silicon content, which means that the proportion of silicon content is greater than 97%; Silicon metal is named after the impurity content, 553 silicon metal refers to iron, aluminum and calcium impurities are less than 0.5%, 0.5%, 0.3% of silicon products.
Industry application:
Silicon is mainly used in iron and steel smelting deoxidizer, part of the application of silicon steel alloy with silicon element, in recent years, a small part of the application to silicon aluminum alloy; Metal silicon is currently mainly used in the production of polysilicon for solar panels, the current industry accounts for more than 50%, and the production of organic silicon intermediates, and the third aspect is applied to the production of aluminum alloy products.
Production process:
Both are used in electric arc furnace smelting, but the requirements for electrodes are different. 97 Silicon multi-purpose self-baking electrode production, metal silicon multi-purpose pre-baking electrode production, the main reason is to reduce the introduction of iron elements.
Classification of metallic silicon
It is usually classified by the content of the three main impurities of iron, aluminum and calcium contained in the metal silicon composition. According to the content of iron, aluminum and calcium in metal silicon, metal silicon can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101 and other different grades.
Metal silicon is mainly divided into ordinary metal silicon, smelting metal silicon and electronic grade metal silicon.
First, common metal silicon
Common metal silicon is the most common type of metal silicon and the most commonly used one in industrial production. Generally speaking, the purity of common metal silicon is relatively low, the impurities are more, and the use is relatively extensive, mainly used in iron and steel smelting, casting industry and other fields. In these fields, common metal silicon is mainly used as raw materials such as deoxidizers, reducing agents, and alloy additives.
Second, smelting metal silicon
Smelting metal silicon, also known as high-purity metal silicon, generally has a higher purity, and its impurity content is relatively low. Mainly used in smelting special casting and fire resistance, photoelectric and other fields. In the field of special casting, smelting metal silicon can be used to produce high-quality stainless steel, alloy steel, carbide and so on. In the fields of fire resistance, photoelectric, etc., it is mainly used for the production of alumina, silicon nitride and other materials.
In short, different kinds of metallic silicon have different uses and characteristics, and different processes are required in the production and processing process. Understanding the characteristics and uses of different kinds of metallic silicon is helpful to select suitable raw materials and improve product quality and efficiency.
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