Refractory bricks are referred to as refractory bricks. They are refractory materials made of refractory clay or other refractory materials. They are light yellow or brown. They are mainly used to build furnaces. They can withstand high temperatures from 1580°C to 1770°C. They are also used as refractory bricks. Shape and size of refractory material. According to the preparation process, it can be divided into fired bricks, non-fired bricks, fused bricks (electric fused bricks) and refractory bricks; according to the shape and size, it can be divided into standard bricks, ordinary bricks, special bricks, etc., various physical and chemical changes under high temperature And mechanical effects, such as refractory clay bricks, high alumina bricks, silica bricks, magnesia bricks, etc.
The firing process is a very important process in the production of refractory bricks. During the firing process, it will not only determine its performance and quality, but also directly affect the quality of the molding. So, what factors will affect the firing process of refractory bricks? Next, let us take a look.
1.vapor deposition
In many smelting furnaces and flame furnaces, the decomposition of carbon monoxide and the volatilization of lead, zinc, and alkali metal oxides occur during the production process, and they are deposited in the pores and joints of refractory bricks, which can cause cracking and deformation of the brickwork. And chemical attack, this phenomenon is more prominent in the upper part of blast furnace, blast furnace, shaft kiln and coke oven, and even becomes the main reason for these parts.
2. The influence of drastic changes in temperature
Many kilns, especially kilns that operate intermittently, have large temperature fluctuations, and sudden changes in temperature will produce large internal stresses, which will lead to cracks and cracks in the refractory brick masonry, peeling, deforming or collapsing in severe cases. Such as steel-making converter, electric arc furnace, copper-tin smelting reverberatory furnace, etc. The furnace temperature during smelting can reach 1250～1650℃, but after slagging, steel tapping, and copper tapping, the temperature in the furnace drops sharply to 600-800℃. Excessive temperature or large fluctuations in a short time will cause the brick body to be stressed and cracked. , Peeling, damage.
3. slag corrosion
Corrosion caused by the physical and chemical action of molten slag and molten metal or corrosive gas containing dust.
