What are the methods of producing silica?

In order to produce high-quality silica, we should start with product design, production process, production environment and production supervision, but the quality and ethics of employees are also decisive factors. Only under a benign mechanism can high-quality silica products be produced. There are three main methods for the production of silica:

The other is chemical vapor deposition. We also call it pyrolysis, dry process or combustion method. The raw materials are silicon tetrachloride, oxygen (or air) and hydrogen, which are produced by high-temperature reaction. The reaction formula is:

SiCl4+2H2+O2=SiO2+4HCl

The second method: precipitation method is also called sodium silicate acidification method. Through precipitation, filtration, washing, drying and calcination, water glass solution reacts with acid to obtain silica. The reaction formula is:

Na2SiO3+2H+->SiO2+2Na++H20

Third, the new method mainly uses non-metallic ores and their extensions as silicon sources. Silica was prepared by precipitation method. The key of this technology is to convert crystalline silica and silicate into amorphous silica. Raw materials mainly include wollastonite, opal, halloysite, olivine, serpentine, kaolin, hard kaolin, coal gangue, fly ash, etc.

At present, precipitation method is adopted in the production of silicon dioxide, and most domestic production enterprises adopt precipitation method. Specific production methods need to refer to relevant materials and production practices. In addition to selecting the correct production method, the method of producing high-quality silicon dioxide is through practice.