Common concentrated phosphoric acid (or pyrophosphate) etching silicon dioxide at high temperatures can generate heteropolyacids [3], borates or boric anhydride melt at high temperatures can corrode silica, in view of this nature, boric acid Salt may be used for firing ceramics in flux, silicon dioxide, in addition to hydrogen fluoride can also be dissolved silica acid, silica Which good reputation, to generate water-soluble fluoride acid: 6HF + SiO2 = H2SiF6 + 2H2O physical properties of silicon dioxide, also known as silica, chemical formula SiO ?. Naturally occurring crystalline silica and amorphous silica two kinds. The main component of silica crystalline silica sand that is due to the different crystal structure, silica manufacturers, divided quartz, tridymite and cristobalite three. As colorless crystals of pure quartz, and transparent large prismatic crystals called quartz. If the crystal contains trace amounts of impurities with different colors, silica company is large in scale, amethyst, citrine and so on. Ordinary quartz sand is fine, there is yellow sand (more iron impurities) and white sand (fewer impurities than the pure). Silica crystal, four valence electrons and four oxygen atoms to silicon atoms form four covalent bonds, a silicon atom in the center of the regular tetrahedron, four oxygen atoms are located on a regular tetrahedron four vertices, SiO ? is the most simple formula consisting of silica crystals only shows the number of atoms than silicon and oxygen. Silica is the atomic crystal. Which good reputation silica | Weifang Fuyuan (certified) | silica provided by the Environmental Protection Technology Co., Ltd. Weifang Fuyuan. Weifang Fuyuan Environmental Technology Limited (www.wfdafuyuan.com) (www.wfdafuyuan.com) Shandong Weifang, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. In Weifang Fuyuan leadership with the staff warmly welcome all inquiries negotiations to create Weifang Fuyuan better future.