Selection of raw materials for silica bricks

Selection of raw materials for silica bricks

 The selection of silica brick raw material types is a key link in manufacturing high-quality silica brick products, and the process needs to be rigorous and professional. The following are the detailed steps and considerations for selecting raw materials for silica bricks:

 Main raw material selection: The main raw material of silica bricks is silica, and its silica (SiO₂) content must reach more than 93% to meet the manufacturing needs of silica bricks. The high purity SiO₂ in silica ensures that the silica bricks have good fire resistance and resistance to acidic slag erosion. In addition, quartz stone is also a common raw material for silica bricks, and its SiO₂ content is also above 90%, providing a stable chemical basis for silica bricks.

 Addition of auxiliary raw materials: In addition to silica and quartz stone, appropriate amounts of auxiliary raw materials need to be added to improve the performance of silica bricks. Limestone, as a calcium-containing raw material, can increase the strength and fire resistance of silica bricks. Clay and sand are used to adjust the density and porosity of the silica bricks and optimize their physical structure. As an acidic refractory material, charred gemstone can significantly improve the high-temperature performance and service life of silica bricks.

 Mineralizing agent and binding agent: During the manufacturing process, mineralizing agents (such as iron scale, lime milk) and binding agents (such as sulfurous acid pulp waste liquid) also need to be added. The mineralizer helps to promote the transformation of quartz in the green body into tridymite and cristobalite, improving the crystallinity and stability of the silica bricks. The binder helps in the mixing and shaping of raw materials, ensuring that the silica bricks maintain good structural strength during the firing process.

 In summary, the selection of raw materials for silica bricks requires comprehensive consideration of the purity, chemical composition, physical properties and production process requirements of the raw materials. Through scientific proportioning and fine processing, silica brick products with excellent performance can be produced to meet the needs of various high-temperature industrial fields.