Up to now, white carbon black products are still very popular with major enterprises. Its product value and application range have always kept it in the first place. So, do you think that such an excellent product should be difficult to produce? In fact, it exists widely. Today, our little editor of IOTA will tell you about its existence and review its physical and chemical properties.


1. Existence of white carbon black:


In nature, white carbon black widely exists in the earth's crust, mainly in silica, quartz, diatom, crystal and sand, and widely exists in the nature in both crystalline and amorphous forms. Colorless and transparent hexagonal prism crystal with hexagonal pyramid at the end is called crystal; Ordinary yellow sand is quartz containing iron compounds, and quartz is also a component of granite and gneiss. Diatomite is a kind of amorphous white carbon black. It is the remains of dead diatoms and other micro organisms. It is a porous, light and soft solid material after deposition and cementation. It has a large surface area and strong adsorption capacity.


2. Structure, physical and chemical properties of white carbon black:


(1) structure of white carbon black: crystal white carbon black is a three-dimensional network crystal formed by silicon atoms and oxygen atoms with covalent bonds. There is no single white carbon black molecule in the crystal. The silicon atoms of white carbon black are in the center of the tetrahedron, and they combine with the four oxygen atoms at the top corner of the tetrahedron with covalent single bonds to form [SiO4] tetrahedron. The Si-O bond is repeated in space to form a large molecule. In the crystal, there are 6 silicon atoms and 6 oxygen atoms on the smallest ring, a total of 12 atoms. The number ratio of silicon to oxygen atoms is 1:2, so the simplest formula of composition is SiO2. There is no single molecule in the crystal.


⑵ physical properties: white carbon black crystal is a hard, brittle, non-conductive, refractory (melting point 1710 ℃) and colorless solid that is difficult to dissolve in water.


(3) chemical property: white carbon black is the anhydride of silicic acid, but it cannot react with water to form silicic acid. Due to the strong silicon oxygen bond, the chemical properties are very stable. It is an acidic oxide with some properties of acidic oxide, such as reacting with basic oxide, alkali and soda ash at high temperature to form silicate; White carbon black does not react with general acid and has good acid resistance, but can be corroded by hydrofluoric acid, so people often use hydrofluoric acid to carve glass; It can be reduced by strong reducing agent (carbon) at high temperature to obtain crude silicon.


Did you not think that it still exists widely? At that time, I also thought that white carbon black should be very difficult to obtain. Now you know it. If you need it, you can find our small editor in IOTA for consultation and purchase.