Silica SiO2 specification: 1-3mm/2-4mm

SiO2 is also called silica. It is widely distributed in nature, such as quartz, quartz sand, etc. White or colorless, light yellow with high iron content. Density 2.2 ~ 2.66 Melting point 1670 ℃ (lepidolite); 1710 ℃ (cristobalite). The boiling point is 2230 ℃, and the relative dielectric constant is 3.9. Insoluble in water and slightly soluble in acid, it can act with molten alkali when it is in granular state. Used for making glass, water glass, pottery, enamel, refractory, ferrosilicon, molding sand, simple silicon, etc.


Silica SiO2 uses:

Silicon standard solution. Water glass, silicon compound preparation material. In transistors and integrated circuits, it is used as a masking film and protective layer for impurity diffusion, and a silicon dioxide film is made as an integrated circuit device. Glass industry.

The bond energy of Si-O bond in SiO Ψ is very high, and the melting point and boiling point are high (melting point 1723 ℃, boiling point 2230 ℃).

SiO₂ + 4HF = SiF4↑ + 2H₂O

Acid oxygen permeability:

Silica and alkaline oxides

SiO Ψ + Cao = (high temperature) CaSiO3

Silicon dioxide can be dissolved in concentrated hot strong alkali solution:

SiO₂ + 2NaOH = Na2SiO3 + H₂O
(the reason why the reagent bottle containing alkali cannot use glass stopper but rubber stopper)

Under high temperature, silicon dioxide can be reduced by carbon, magnesium and aluminum:

SiO Ψ +2c= (high temperature) si+2co

Physical properties of silica and SiO2:

Silicon dioxide, also known as silica, has the chemical formula of sio‹. There are two kinds of crystalline silica and amorphous silica in nature. Crystalline silica can be divided into quartz, scaly quartz and cristobalite due to different crystal structures. Pure quartz is colorless crystal, and large and transparent prismatic quartz is called crystal. If the crystal containing trace impurities has different colors, there are Amethyst, tea crystal, ink crystal, etc. Ordinary sand is fine quartz crystal, including yellow sand (more iron impurities) and white sand (less impurities and purer). In silicon dioxide crystal, the four valence electrons of silicon atom form four covalent bonds with four oxygen atoms. The silicon atom is located in the center of the regular tetrahedron, and the four oxygen atoms are located on the four vertex angles of the regular tetrahedron. SiO Ψ is the simplest formula for composition, which only represents the ratio of the number of silicon and oxygen atoms in silicon dioxide crystal. Silicon dioxide is an atomic crystal.

Diatomite existing in nature is amorphous silicon dioxide, which is the remains of low aquatic plant diatoms. It is a white solid or powdery, porous, light, soft solid with strong adsorption.

The company takes "new concepts, new technologies, new products" and "pursuing customer satisfaction" as its goal. We are committed to implementing the IS9001 quality management system and have obtained a number of patents. After years of efforts, SiO2 with high purity, high density and monomer has been developed and produced for precision optical applications