A. The chemical formula of silica is SiO2, and it has two forms: crystalline and amorphous.
B. Silica existing in nature such as quartz, quartz sand, etc. are collectively called silica.
C. Pure quartz is a colorless crystal. Large and transparent prismatic quartz crystals are called crystals. Those that contain trace impurities and are purple are called amethysts. Light yellow, golden and brown ones are called smoky quartz.
D. Chalcedony, agate and jasper are all colored quartz crystals containing impurities. Sand is fine grains of quartz mixed with impurities. Opal and diatomaceous earth are amorphous silica.
E. Silica has a wide range of uses. It is mainly used in making glass, water glass, pottery, enamel, refractory materials, airgel felt, ferrosilicon, molding sand, elemental silicon, cement, etc. In ancient times, silica was also used Making the glaze and body of porcelain.
F. Ordinary stones are mainly composed of silica, calcium carbonate and other components.
1. Silica is a raw material for manufacturing glass, quartz glass, water glass, optical fiber, important components of the electronic industry, optical instruments, handicrafts and refractory materials. It is an important material for scientific research.
2. When silica crystallizes, it becomes crystal. After gelation and dehydration, it becomes agate. After the water-containing colloid solidifies, it becomes opal. When the silica grains are smaller than a few microns, it forms chalcedony, chert, and secondary quartzite.
3. Mineral resources with very stable physical and chemical properties. The crystal belongs to the oxide mineral of the trigonal crystal system, that is, low-temperature quartz (α-quartz). It is the most widely distributed mineral species among the quartz minerals.
4. Quartz in a broad sense also includes high-temperature quartz (β-quartz). Quartz block, also known as silica, is mainly the raw material for the production of quartz sand (also known as silica sand), as well as the raw material for quartz refractory materials and fired ferrosilicon.
In addition, silica can also be used as a lubricant and an excellent flow promoter, mainly used as a lubricant, anti-sticking agent and flow aid.
5. It is especially suitable for granulating oils and extract drugs. The granules produced have good fluidity and compressibility. It can also be used as a glidant in direct compression tableting.
6. As a disintegrant, it can greatly improve the fluidity of particles, increase bulk density, increase the hardness of the prepared tablets, shorten the disintegration time, and increase the drug dissolution rate.
7. It can be used as an internal desiccant in the manufacture of granules to enhance the stability of the drug. It can also be used as a filter aid, clarifying agent, defoaming agent, as well as a suspending agent and thickener for liquid preparations.
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A. The chemical formula of silica is SiO2, and it has two forms: crystalline and amorphous.
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