What are the factors that affect the hanging kiln coating

　　The conditions for the formation of the kiln coating include the following points. First, the kiln material must have a liquid phase; the aluminum content, particle size, and proportion of the kiln material must be appropriate; in addition, the surface of the refractory material is sweating; the reaction layer of the refractory material kiln coating should not be burnt out; " Freeze", "tear" balance, etc. Based on these conditions, we will introduce the factors that affect the hanging kiln coating.

　　1. The influence of kiln feed liquid relative to hanging kiln coating

　　If the temperature is low and the liquid phase of the kiln material is small, the kiln coating cannot be hung; on the contrary, if the liquid phase is too much, the kiln coating is easy to be burnt. In terms of refractory materials, if the surface of the kiln lining does not "sweat", it is difficult for the surface of the refractory brick to stick to the kiln material. However, if the kiln lining "sweats" too much, the refractory material will be severely eroded, and the life of the kiln lining will also be reduced.

　　2. The ratio of coarse and fine particles in kiln materials

　　From the perspective of cement clinker, the adhesion tendency of fine particles is large, and the erosion ability of coarse particles is strong. There needs to be a certain proportion of coarse and fine particles in the kiln material to ensure the balance between the speed of being adhered to the kiln material and the speed of being torn off the kiln coating. In short, the kiln coating is the product of the interaction between cement clinker and refractory materials under high temperature conditions. Hanging the kiln coating requires coordination of cement production conditions and refractory materials.

　　3. Effect of clinker chemical composition on hanging kiln coating

　　The aluminum ratio of cement clinker significantly affects the clinker adhesion behavior. The clinker adhesion becomes stronger as the aluminum ratio decreases. However, as the aluminum rate decreases, the infiltration of silicate in the clinker relative to the refractory material becomes serious. Although the infiltration of silicate is beneficial to the formation of kiln coating, excessive infiltration means the reduction of thermal shock stability. The composition of cement clinker has a great influence on the hanging kiln coating. When designing the clinker composition, cement technicians should not only consider high yield, high quality and low consumption, but also consider the influence of clinker composition on the kiln coating hanging property.

　　4. Effect of refractory brick performance on hanging kiln coating

　　The chemical mineral composition, porosity, and firmness of the organizational structure of the refractory material determine whether the clinker component can easily enter the brick body, and what kind of substance is produced after reacting with the refractory material. Therefore, it is determined whether the refractory material is easy to "sweat", whether it is easy to be wetted by the clinker liquid phase, and whether it is easy to bond cement clinker particles to form a kiln coating.

　　Further reading:

　　1. What are the important effects of magnesia-iron spinel bricks on cement kiln coating?

　　The firing zone of the cement rotary kiln is the key area for cement to complete the transformation of the silicate crystal phase. In the firing zone of the kiln, the flame temperature is as high as 1800 ℃ to 2000 ℃, and a large amount of radiant energy is emitted to the surroundings. The long-term licking effect of the flame will Any refractory bricks are quickly decomposed and damaged. In order to resist the high temperature, a layer of kiln coating needs to be glued to protect the lining bricks. Magnesia-iron-spinel refractory bricks are products used in the firing zone of rotary kilns. The effect of hanging the kiln coating is excellent, which can ensure the long-term normal operation of the rotary kiln system and effectively protect the cylinder.

　　2. The relationship between magnesia iron spinel brick and cement kiln coating

　　Magnesia-iron spinel brick is a patented product invented by Zhengzhou Zhenjin Refractories Co., Ltd. (zl 2012 1 0183880.1). In magnesia-iron bricks, iron and aluminum oxides easily react with calcium oxide in cement clinker to form ferric acid Mineral phases with low melting points such as dicalcium and calcium ironite, these mineral phases with a certain viscosity can adhere to the working surface of refractory bricks, and gradually form a uniform and stable kiln coating with a thickness of about 200mm. The "kiln coating" exists stably for a long time, which reduces the high-temperature melting loss and wear of the material on the refractory bricks, so as to achieve a good effect of protecting the kiln lining.