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Weden Metal Co.,Limited

Add:1105RM Rainbow Mansion, Renmin Road 23rd, Dalian, Liaoning Province, China.

Contact us:Chi Yanhui

Tel:+86-411-88858678

Fax:+86-411-82561639

Mob:+8618640867867

E-mail:dlglt@126.com


Classification

Weden Metal Co.,Limited | Updated: Apr 21, 2017

The classification of metallic silicon is usually classified according to the content of three main impurities of iron, aluminium and calcium in metallic silicon. According to the content of iron, aluminium and calcium in silicon metal, the silicon can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101 and other different grades.

In industry, silicon is usually made of carbon dioxide in an electric stove. Chemical reaction equations: SiO2 + 2C → Si + 2CO The purity of silicon is 97, called silicon Metal. After melting it again recrystallization, with acid to remove impurities, the purity of 99.7 metal silicon.

Silicon is mainly composed of silicon, so it is similar to silicon. Silicon has amorphous silicon and crystalline silicon two kinds of allotrope. Amorphous silicon is a gray-black powder, and is actually a micro-crystalline. Crystalline silicon with diamond crystal structure and semiconductor properties, melting point 1410 ℃, boiling point 2,355 ℃, density 2.32~2.34 grams/cm 3, MO hardness 7, brittle. Amorphous silicon chemical properties lively, in oxygen can burn violently. It reacts with halogen, nitrogen, carbon and other nonmetallic materials at high temperatures, and can also produce silica with the metal effect of magnesium, calcium and iron. Amorphous silicon is almost insoluble in all inorganic acids and organic acids, including hydrofluoric acid, but soluble in nitric acid and hydrofluoric acids. Concentrated sodium hydroxide solution can dissolve amorphous silicon, releasing hydrogen. Crystalline silicon is less lively, even at elevated temperatures not with oxygen, it is not soluble in any kind of inorganic acids and organic acids, but soluble in nitric acid and hydrofluoric acids mixed with concentrated sodium hydroxide solution