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Introduction to silicon metal

Weden Metal Co.,Limited | Updated: Nov 30, 2017

Introduction to silicon metal 

English name: Silicon

English alias:silicon coating quality balzers; silicium; silicon, containing by weight not less than 99.99 % of silicon; SiliconpowderNmesh; Silicon Monocrystalline; SiliconchipsNmm; SiliconrandompiecesNcm; Silicon wafer orientation P-doped; Silicon wafer orientation; Silicon powder; Siliconwaferorientation; Siliconwafer; Silicon (low oxygen); Silicon (3 oxygen levels); Silicon chips (99.9999%); Silicon random pieces (99.5%); Silicon solution 1000 ppm


CAS: 7440-21-3

EINECS: 231-130-8

Molecular formula: Si

Molecular weight: 28.0855

HS CODE: 2804.6900


Define the editor

"Metal silicon" (also known as industrial silicon) is a commodity name that emerged in the mid-1960s.Its emergence has been linked to the rise of the semiconductor industry.The international common practice is to divide commodity silicon into silicon and semiconductor silicon.Metal silicon is made from quartz and coke in electric heating furnace smelting products, the main ingredient of silicon content in 98% (99.99% of Si content is also included in the silicon metal), the rest of the impurities of iron, aluminum, calcium, etc.Semiconductor silicon is used to make high purity silicon for semiconductor devices.Sell in polycrystalline, single crystal form, the former cheap, the latter price.It is divided into various specifications for different purposes.According to statistics, in 1985 the world consumes about 500000 tons of silicon metal, which is used for aluminium alloy of silicon metal accounted for about 60%, less than 30% for organic silicon, used in semiconductor accounted for about 3%, the rest used for smelting steel and precision ceramics, etc.


The nature of silicon editing

Silicon is one of the semi-metals, formerly known as "silicon".Melting point is 1420 ℃, the density of 2.34 grams per cubic centimeter.It's hard and crisp.It is not soluble in acid at normal temperature and is soluble in alkali.The properties of metal silicon are similar to germanium, lead and tin.Silicon is abundant in the earth's crust, second only to oxygen, which accounts for more than a quarter of the total weight of the earth's crust, and exists in the form of silica or silicate.The most pure silica minerals are quartz or silica.Silicon has two different types of allotropes: a dark brown amorphous powder that has a lively nature and can be burned in the air.Another is stable crystal (crystalline silicon).Ordinary silica and quartz are used for glass and other building materials, and high quality quartz is used to make alloys, metals and single crystals


Classification of editing

The classification of metal silicon is usually classified according to the content of iron, aluminum and calcium contained in the metal silicon.According to the content of iron, aluminum and calcium in metal silicon, the metal silicon can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101, etc.

In industry, metal silicon is usually made from carbon dioxide in a furnace.Chemical reaction equation: SiO2 + 2C - Si + 2CO has a purity of 97~ 98%, which is called metal silicon.After it is melted, it is recrystallized, and it is used to remove impurities with acid and get the metal silicon with purity of 99.7~ 99.8%.

Silicon is mainly silicon, so it has similar properties to silicon.Silicon has amorphous silicon and crystalline silicon.Amorphous silicon is a grayish black powder and is actually a microcrystal.Crystalline silicon crystal structure and the semiconductor properties of diamond, melting point 1410 ℃, boiling point 2355 ℃, 7, mohs hardness brittle.Amorphous silicon is active in nature and can be combust in oxygen.It can react with halogen, nitrogen, carbon and other nonmetals in high temperature, and can also work with magnesium, calcium, iron and other metals to make silicon.Amorphous silicon is almost insoluble in all inorganic acids and organic acids, including hydrofluoric acid, but is soluble in the mixture of nitric acid and hydrofluoric acid.The sodium hydroxide solution can dissolve amorphous silicon and release hydrogen.Crystalline silicon less lively, even at high temperatures is not combine with oxygen, it does not dissolve in any kind of inorganic acid and organic acid, but soluble in nitric acid and hydrofluoric acid mixed acid and concentrated sodium hydroxide solution.