METHODS FOR PRODUCING HIGH-DISPERSION SILICON DIOXIDE

doi: 10.25712/ASTU.2072-8921.2021.02.026

Abstract

The article presents an analysis of methods for obtaining silicon dioxide by liquid-phase (sol-gel) and gas-phase (pyrolysis and plasma-chemical) methods. Technologies for producing silicon dioxide of various forms are considered: precipitated (white soot) and pyrogenic (aerosil). Examples of the use of technologies in industry are given. The research methods included all available sources of information: patent databases of the Russian Federation, electronic sources of the RSCI. Recycled industrial waste and silicon-containing by-products are some of the richest sources of silicon dioxide. It has been shown that the initial technologies for the production of silicon dioxide require modification to eliminate disadvantages and improve the quality of the product. Compared with the initial developments, the variety of raw materials has increased significantly, the methods have been modified by adding stages (for example, carbonization in the liquid-phase method) and eliminating energy-intensive ones. It can be concluded that in the future, in view of the wide scope of application (chemical, construction, food, pharmaceutical and other types of industry) technologies will require the creation of new methods for the extraction and separation of silicon dioxide from secondary silicon-containing raw materials.