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What is the difference between the models of metal silicon 553, 441 and 3303?


 Metal silicon, also known as crystalline silicon or industrial silicon, is mainly used as an additive for non-ferrous alloys. Silicon is a non-metallic element, gray, metallic color, hard and brittle. The content of silicon accounts for about 26% of the mass of the earth's crust; the atomic weight is 28.80; the density is 2.33g/m3; the melting point is 1410°C; the boiling point is 2355°C; and the resistivity is 2140Ω.m.

The grades of metallic silicon: According to the content of iron, aluminum and calcium in metallic silicon, metallic silicon can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101 and other different grades.
Additional products of metal silicon: including silicon micropowder, edge silicon, black silicon, metal silicon slag, etc. Among them, silica micropowder is also called silica fume, micro-silica fume or silica fume, which is widely used in refractory materials and concrete industries.
Application of metallic silicon: metallic silicon (Si) is an industrially purified elemental silicon, which is mainly used for the production of organic silicon, the preparation of high-purity semiconductor materials, and the preparation of alloys for special purposes.
(1) Production of silicone rubber, silicone resin, silicone oil and other silicones
Silicone rubber has good elasticity and high temperature resistance, and is used to make medical supplies, high temperature gaskets, etc.
Silicone resins are used in the production of insulating paints, high temperature coatings, etc.
Silicone oil is an oily substance whose viscosity is little affected by temperature. It is used in the production of advanced lubricants, polishes, fluid springs, dielectric liquids, etc. It can also be processed into colorless and transparent liquids for spraying as an advanced waterproofing agent. on the building surface.
(2) Manufacture of high-purity semiconductors
Almost all modern large-scale integrated circuits are made of high-purity metal silicon, and high-purity metal silicon is also the main raw material for the production of optical fibers. It can be said that metal silicon has become the basic pillar industry of the information age.
(3) Preparation of alloys
Silicon aluminum alloy is the most widely used silicon alloy. Silicon aluminum alloy is a kind of strong composite deoxidizer, which can improve the utilization rate of deoxidizer by replacing pure aluminum in the steelmaking process, and can purify molten steel and improve the quality of steel. Silicon aluminum alloy has low density, low thermal expansion coefficient, good casting performance and anti-wear performance. The alloy castings cast with it have high impact resistance and good high pressure compactness, which can greatly improve the service life. It is often used to produce aerospace vehicles. and auto parts.

Silicon copper alloy has good welding performance, and it is not easy to generate sparks when it is impacted. It has explosion-proof function and can be used to make storage tanks.
Silicon is added to steel to make silicon steel sheet, which can greatly improve the magnetic permeability of steel, reduce hysteresis and eddy current loss, and can use it to make iron cores of transformers and motors to improve the performance of transformers and motors.
With the development of science and technology, the application field of metal silicon will be further expanded
The main producing areas of silicon metal: silicon metal is mainly distributed in Yunnan, Sichuan, Guizhou, Guangxi, Hunan, Hubei in central China, Fujian in east China, and Heihe, Linjiang, Jilin and Liaoning in Heilongjiang in northeast China. Inner Mongolia, including Shaanxi Qinghai and other places are also produced by manufacturers.

The first two are low-grade metal silicon, and 3303 is high-grade and high-purity, so it can be used to make polysilicon.