Silicon Dioxide

Silicon dioxide (chemical formula: SiOz) is an acidic oxide, the corresponding hydrate is silicic acid (H2SiOs), silicon dioxide is one of the most important compounds of silicon. The natural silica existing on the earth accounts for about 12% of the mass of the crust, and its existence forms are crystalline and amorphous two categories, collectively known as silica.

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Product Introduction

Products Description

Silica is also known as silica, chemical formula SiO₂. There are two kinds of crystalline silica and amorphous silica in nature. Because of the different crystal structure, crystalline silica can be divided into three kinds: quartz, squamous quartz and cristobalite. Pure quartz is a 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 and so on. Ordinary sand is a fine quartz crystal, with yellow sand (more iron impurities) and white sand (less impurities, more pure).

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►Basic use

1.Silicon dioxide is the manufacturing of glass, quartz glass, water glass, optical fiber, electronic industry important components, optical instruments, crafts and refractory materials, is an important material for scientific research. 2.Applications of silica: flat glass, glass products, casting sand, glass fiber, ceramic glaze, sand blasting for rust prevention, sand for filtration, flux, refractory and manufacture of Autoclaved Lightweight Concrete. Silica has many uses. The relatively rare crystals in nature can be used to manufacture important components of the electronics industry, optical instruments and crafts, and silicon dioxide is an important raw material for the manufacture of optical fiber. Generally more pure quartz, can be used to make quartz glass, quartz glass expansion coefficient is very small, equivalent to ordinary glass 1/18, can withstand drastic changes in temperature, good acid resistance (except HF), therefore, quartz glass is commonly used to make high temperature resistant chemical instruments. Quartz sand is commonly used as glass raw materials and building materials.

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►Synthesis method

1. Ion exchange method: The diluted water glass is filtered to remove impurities through cation exchange, anion exchange, pH value adjustment, evaporation or ultrafiltration concentration, silica sol is prepared.

2. Silica powder method: Distilled water and sodium hydroxide (reagent grade) are added to the reaction tank, the temperature is raised to 65℃, a certain amount of ammonia is added to adjust the alkalinity, and silica powder is added in batches under agitation, and the temperature is controlled below 8.3℃. After the silica powder is added, it is continued to stir for 2~3h, and when the pH value is reduced to 9~10, the sample is analyzed, and the reaction is cooled to 50℃ under agitation after the reaction is completed. Silica sol product was prepared. The unreacted silica powder can be recovered and reused.

3. Sulfuric acid method: the diluted water glass and dilute sulfuric acid are mixed at 20~30℃ for reaction to produce silicon gel, aging for 4h, soaked with 2%~2.5% dilute sulfuric acid for 1h, washed with water at 40~50℃, dehydrated to water content s80% in the rotary dryer, dried to water content s10%, and activated in the activation furnace at 500~550℃. The coarse pore microspheres were prepared by screening.

4 When refining pig iron, the waste residue contains silica.