Refractory castable refers to the mixture composed of refractory aggregate, binder and admixture, which is mixed with water (or liquid binder) to form a mud that can be constructed by pouring method. The difference from other unshaped refractory materials is that the refractory castable has a certain setting and hardening time after construction. Therefore, the refractory castable needs to be cured for a certain period of time before it can be demolded, and then it can be put into use after an appropriate period of natural curing. Baking use. Today, the editor of magnesia brick manufacturers will introduce the application of refractory castables.
Compared with refractory bricks, refractory castables have the characteristics of simple process, energy saving, low cost, and easy mechanized construction. At present, it has been widely used in various types of thermal equipment such as cement, steel, glass, and electricity.
1. Refractory castable for cement rotary kiln
Refractory castables have been widely used in new dry process cement rotary kilns. There are many kinds of refractory castables used in this kiln. According to the different working environments of the kiln, the applied refractory castables include ordinary refractory castables, low-cement refractory castables, ultra-low cement refractory castables, and cement-free refractory castables. refractory castables, steel fiber refractory castables, anti-cracking refractory castables, anti-skin refractory castables, phosphate refractory castables, alkali-resistant castables and heat-insulating castables, in addition, there are new types of castables such as self-flowing refractory castables.
2. Refractory castables for glass melting furnaces
Due to the working environment requirements of the glass melting furnace itself, the refractory castables used should have the characteristics of good high temperature resistance, strong resistance to glass liquid erosion, and low porosity. The main refractory castables used are fused silica castables, corundum castables, and lightweight mullite castables.
3. Refractory castables for metallurgical industry
1) Refractory castables for iron-making system In the iron-making system, there are many refractory castables for blast furnace tapping trenches, and ASC refractory castables are generally used. ASC castables are generally low-cement or ultra-low-cement castables, mainly composed of Al2O3 aggregates, SiC, carbon, cement and various additives.
2) Refractory castables for molten iron pretreatment
Fourth, the application of refractory castables in ladle
In the application of refractory castables, aluminum silicon carbide carbon castables are mainly used in the furnace bottom, molten pool and slag line. The spray gun is an important device for the pretreatment of molten iron. The spray gun refractory material has gradually developed into a castable integral pouring spray gun, and its material is mainly Al2O3-SiO2 system. The overall spray gun made of the castable has the characteristics of uniform organization, no joints, good thermal shock resistance and long service life.
5. Refractory castables for electric furnace steelmaking
The application of refractory castables in electric furnaces is mainly concentrated in the furnace cover of electric furnaces. In the late 1990s, the technology of fully water-cooled furnace tops was widely used, and the overall prefabrication technology of castables was generally used in the electrode triangle area. On the whole, the overall castable cover may become a development trend of electric furnace cover materials in the future.