What are the types and types of refractory materials?

What are the refractory materials? Materials and products made of inorganic non-metallic materials with a fire resistance of not less than 1580 ℃ are all refractory materials. Refractory materials can be divided into two categories: fixed (refractory bricks) and amorphous (castable materials, plastic materials, ramming materials, etc.), heavy and light, ordinary and special, and can also be classified according to industry kiln equipment, chemical properties, materials, etc. For a detailed introduction, please refer to Baidu Baike Refractory Materials. Refractory raw materials

According to the "Recent Social and Economic Industry Categories", the metallurgical industry and thermal insulation and refractory materials are classified as category C processing industry, and category 40 mining enterprise physical products industry.

According to B2B platform classification, there are chemical industry, building materials industry, and metallurgy industry. Refractory materials belong to inorganic non-metallic industries, but also belong to manufacturing, heavy industry, construction, and high-tech industries. They are widely used in industries such as metallurgy, chemical industry, petroleum, mechanical manufacturing, silicate, and power, accounting for 50% to 60% of the total production in the metallurgical industry.

Silicon based raw materials, wax based raw materials, clay based raw materials, high alumina raw materials, dolomite based raw materials, magnesium based raw materials, and others.

The main raw material for siliceous refractory minerals is silica. Silica is not a mineral name but an industrial term, and in industry, it is referred to as a block like siliceous raw material as silica. Its main mineral is quartz, with the main chemical composition being SiO2. Silica can be classified according to its structural density, crystal transformation rate, and degree of heating expansion. Generally speaking, crystalline silica is relatively pure and dense, and can be used as a raw material for making bricks and preparing siliceous refractory concrete. Cemented silica, due to its high content of impurities, is prone to loosening after burning and is rarely used.

Wax based raw materials: Generally speaking, wax refers to minerals with a slippery texture mainly composed of pyrophyllite, so it is also called pyrophyllite. The wax stone used in industry is mostly composed of pyrophyllite, which is a dense block ore coexisting with minerals such as kaolinite, bauxite, quartz, chalcedony, and mica. Natural paraffin can be used to produce semi silica refractory products.

Clay is not a single mineral, but is composed of a diameter of less than 0.001mm (or less than 1-2 μ m) A mixture of various hydrated aluminum silicate minerals. It is characterized by plasticity in both wet and fine powder states (obtained by mixing with crushed water), hardening after drying, and vitrification by heating at a sufficiently high temperature. Clay can be divided into primary clay, secondary clay, and soft clay and hard clay based on their plasticity. According to rock type, it can be divided into kaolin, kaolinite clay, and kaolinite clay rock.

The raw materials for producing high alumina products can be divided into aluminosilicate minerals according to their main mineral phases, such as sillimanite, kyanite, and andalusite, as well as artificially synthesized mullite. Aqueous alumina minerals include bauxite, such as boehmite, boehmite, and gibbsite. Anhydrous alumina raw materials, such as natural alumina, industrial alumina, fused alumina, etc. According to the main mineral composition, bauxite can be divided into: (1) diaspore high alumina (D-K) type, (2) diaspore pyrophyllite (D-P) type; (3) Boehmite kaolinite type (B-K); (4) Hydroaluminite Ili stone (D-I) type; (5) Water alumina kaolin rutile (D-K-R) type.

The main raw material for producing magnesia refractory materials, magnesia, refers to sintered magnesia with a certain particle composition. It is made by crushing sintered magnesia. Sintered magnesite can be obtained by calcining magnesite. In addition, sintered magnesia can also be extracted from seawater, salt lake brine, dolomite, serpentine, and brucite. However, currently, sintered magnesia in China is mainly obtained by calcining natural magnesite, and the salt lake magnesium extraction project is under construction. Olivine minerals include a group of minerals with similar composition and belonging to the same orthorhombic system. This type of mineral is commonly found in nature, mainly consisting of magnesium olivine and magnesium iron olivine. But only pure peridotite with low iron content or serpentinized pure peridotite can be used as raw materials for producing refractory materials.