Main types of refractory bricks

Refractory bricks are the basic materials for high-temperature technology and have a very close relationship with various industrial kilns. Various industrial kilns such as glass kilns have different requirements for refractory bricks, which are the main wood materials, due to their different uses and conditions of use. Different types of refractory bricks also show different fundamental characteristics due to differences in chemical mineral composition, microstructure, and production processes. Therefore, in the process of understanding and researching industrial furnace building materials, it is necessary to express and introduce the types of refractory bricks.

The following is a list of contents:

• Silicon aluminum refractory bricks

• Alkaline series refractory bricks

Silicon aluminum refractory bricks

It is reported that it is based on the phase diagram of the binary system of alumina and silica as the basic theory, which mainly includes the following types. Silica bricks refer to refractory bricks containing more than 93% SiO2 and are the main varieties of acid refractory bricks. It is mainly used for masonry coke ovens, also used for the vaults and other load-bearing parts of thermal kilns of various glass, ceramics, and refractory bricks, and also used in high-temperature load-bearing parts of hot blast stoves, but it should not be below 600 ℃ and used in thermal equipment with large temperature fluctuations; clay bricks, clay bricks are refractory bricks mainly composed of mullite, glass phase, and cristobalite and quartz. Usually, hard clay is used as raw material, clinker is calcined in advance and then mixed with soft clay. A small amount of water glass, cement, and other binders can also be added to make fired products and amorphous materials. It is commonly used refractory bricks in blast furnaces, hot blast stoves, heating furnaces, power boilers, lime kilns, rotary kilns, ceramics, and refractory brick firing kilns; high alumina refractory bricks, the mineral composition of high alumina refractory bricks is corundum, mullite and the glass phase, the content of which depends on the ratio of alumina to silica and the type and the number of impurities, can be graded for refractory bricks by the alumina content. The raw materials are high-alumina bauxite and sillimanite natural ore, and there are also fused corundum, sintered alumina, synthetic mullite, and clinker calcined with alumina and clay in different proportions. It is mostly produced by the sintering method. But there are also fused cast bricks, fused granulated bricks, and unshaped refractory bricks. High alumina refractory bricks are widely used in the iron and steel industry, non-ferrous metal industry, and other industries; corundum refractory bricks, corundum bricks refer to a kind of refractory bricks with AL2O3 content not less than 90%, and corundum as the main phase, which can be divided into sintered corundum Bricks and Fused Corundum Bricks.

Alkaline series refractory bricks

Alkaline refractory bricks refer to refractory products with alkaline oxides such as magnesium oxide and calcium oxide as the main components. The main varieties are as follows. Magnesium refractory bricks refer to refractory bricks with magnesia as raw material, periclase as the main crystal phase, and MgO content of 80% to 85%. Its products are divided into two categories: metallurgical magnesia and magnesia products. According to different chemical compositions and uses, there are martin sand, ordinary metallurgical magnesia, ordinary magnesia bricks, magnesia silica bricks, magnesia alumina bricks, magnesia calcium bricks, magnesia carbon bricks, and other varieties. Magnesia refractory bricks are the most important products in alkaline refractory bricks, with high refractoriness, good resistance to alkaline slag and iron slag, and are an important high-grade refractory brick. Mainly used in the open hearth, oxygen converter, electric furnace, non-ferrous metal smelting, etc. Dolomite bricks are alkaline refractory bricks produced with dolomite as the main raw material. It is widely used in alkaline converters, and can also be used as the lining of some refining bags outside the furnace; forsterite refractory bricks are a kind of refractory bricks with forsterite 2MgO·SiO2 as the main composition. Mainly used for open-hearth regenerator checker bricks, ingot bricks, heating furnace bottoms, and copper smelting furnaces.

In recent years, with the rapid development of various industries in China, the requirements for refractory bricks are getting higher and higher. In the fierce market competition, the company will develop various types of refractory bricks of better quality with the original intention of serving society. After reading the above content, if you are interested in refractory bricks, you can check the website https://www.yufengrefractory.com/ of our company, we look forward to your arrival.