How to buy high quality silicon metal
In fact, silicon metal can be divided into many kinds. In order to let everyone have a more comprehensive understanding of silicon metal, the kinds of silicon metal will be introduced.
Silicon metal can be divided into different grades according to the components of iron, aluminum, calcium and other three main impurities in the composition of silicon metal.
Industrially, silicon metal is usually made by reducing silicon dioxide from carbon in an electric furnace. Chemical reaction equation: SiO2 + 2C Si + 2CO so made of silicon purity of 98-99%, called metallic silicon. After melting it again recrystallize, remove impurity with acid, get purity of 99.7-99.8% silicon metal.
The silicon metal is mainly composed of silicon, so it has similar properties to silicon. Silicon has two allotropes: amorphous silicon and crystalline silicon. Amorphous silicon is a gray-black powder that is actually a microcrystal. Crystal silicon has the crystal structure and semiconductor properties of diamond, melting point 1410℃, boiling point 2355℃, Mohrs hardness, brittle. Amorphous silicides are active and can burn violently in oxygen. It reacts with non-metals such as halogens, nitrogen and carbon at high temperatures, and can also react with metals such as magnesium, calcium and iron to produce silicides. Amorphous silicon is almost insoluble in all inorganic and organic acids, including hydrofluoric acid, but soluble in the mixture of nitric acid and hydrofluoric acid. The concentrated sodium hydroxide solution dissolves amorphous silicon and gives off hydrogen gas. Crystal silicon is less reactive and does not combine with oxygen even at high temperatures. It is also insoluble in either inorganic or organic acids, but soluble in a mixture of nitric and hydrofluoric acids as well as in concentrated sodium hydroxide solutions.
Due to the limited time, the introduction of silicon metal is here first, I hope you can through the information, deepen the understanding of silicon metal, and then choose high-quality silicon metal. Of course,
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