Silica Rock
Silica is the main raw material for siliceous refractory materials. Silica is also called Quartzite, and the main mineral is quartz SiO2
Organizational Structure Classification
Silica used in refractory industry can be divided into crystalline silica (recrystallized Quartzite) and cemented silica (colloidal quartzite).
Crystalline silica
It is Metamorphic rock formed by recrystallization of siliceous sandstone (quartz sandstone) through Metamorphism. The siliceous cement in siliceous sandstone is recrystallized on the surface of the original quartz particles under geological conditions, becoming an enlarged part of the quartz particles. Therefore, its organizational structure is characterized by being composed of crystalline quartz particles, with no or very little cementation between the quartz particles (3% to 8%); Due to the recrystallization process during metamorphism, quartz particles are tightly connected and form various metamorphic structures that are not found in the original siliceous sandstone, such as serrated structure, granite structure, and mosaic structure.
Vein quartz also belongs to crystalline silica, which is Igneous rock. It is characterized by large quartz grains (>2mm), high purity (SiO2>99%), slow transformation during calcination, and large expansibility. It is difficult to directly use it to make bricks.
Cemented silica
The Sedimentary rock is formed by combining quartz particles with siliceous cement. The gel structure is mainly cryptocrystalline secondary quartz, and the cement content is generally about 30%~75%. The quartz particles in cemented silica have smaller crystallization and higher impurity content, making them easy to transform when heated.
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