1. Application of refractory castables in cement rotary kiln.
In new dry process cement rotary kilns, refractory castables have been widely used. According to the different working environments of the kiln, the refractory castables used include ordinary refractory castables, low cement refractory castables, ultra-low cement refractory castables, cement-free refractory castables, steel fiber refractory castables, explosion-proof refractory castables, Anti-crushing refractory castables, phosphate refractory castables, alkali-resistant castables, heat-insulating castables, in addition, there are new castables such as self-flowing refractory castables.
2. Application of refractory castables in glass melting furnaces.
Due to the working environment requirements of the glass melting furnace itself, the refractory castable used should have the characteristics of good high temperature resistance, strong resistance to glass liquid erosion, and low porosity. The main refractory castables used include fused quartz castables, corundum castables, light mullite castables, zircon ramming materials, etc.
3. Application of refractory castables in metallurgical industry.
(1) Refractory castables for iron-making systems
In iron-making systems, refractory castables are mostly used for blast furnace tap troughs, and ASC refractory castables are generally used. ASC castables are generally low cement or ultra-low cement castables, mainly composed of Al2O3 aggregate, SiC, carbon, refractory cement and various admixtures. Different materials are used in different parts of use, such as in the main ditch, slag ditch, branch ditch, etc.
(2) Refractory castables for molten iron pretreatment
The application of refractory castables in molten iron ladles mainly uses aluminum silicon carbide carbon at the furnace bottom, molten pool and slag line. Castable. The spray gun is an important device for the pretreatment of molten iron. Nowadays, the refractory materials used in the spray gun are mostly made of castables and are mainly made of Al2O3-SiO2 series. The integral spray gun made of this castable has the characteristics of uniform structure, no seams, good thermal shock resistance, and long service life.
4. Refractory castables for electric furnace steelmaking
The application of refractory castables in electric furnaces is mainly concentrated in the cover of the electric furnace. In the electric triangle area, the castables are generally prefabricated as a whole. Technical integral castable furnace cover may become a development trend of electric furnace cover materials in the future. The materials of prefabricated blocks are divided into corundum, high alumina, and mullite. The user provides drawings, usage parts, and temperatures. According to the drawings, the manufacturer uses appropriate refractory castables to cast prefabricated parts, which are cured and baked before delivery. It can be assembled and used on-site after being transported to the user's location.
5. Refractory castables for refining outside the furnace
(1) Refractory castables for RH furnace. High-aluminum castables and aluminum-magnesium castables are used in small amounts in the lining of RH furnaces. The upper part of the RH vacuum chamber is integrally lined with Al2O3-MgO·Al2O3 castable or shotgunned integrally. The outer wall of the RH furnace impregnated tube is made of integral aluminum-magnesium castable.
(2) Refractory castables for LF furnace. The materials used for the curtain wall of the LF furnace cover are mainly high-aluminum or corundum series castables. High-alumina-spinel refractory castables are often used to cast large bricks in the impact zone at the bottom of the package;
(3) Refractory castables are used for CAS refining equipment. The CAS refining device is divided into upper and lower parts, and the refractory materials used are all castables; the upper part mostly uses low-expansion Al2O3-SiO2 series castables. The lower part mostly uses corundum-spinel series castables with fused corundum and MgO fine powder added. In the later stage, in order to extend the service life of the device, magnesia-aluminum gunning materials are mostly used.
(4) Refractory castables for ladles. The types of refractory castables used in ladles mainly include aluminum-magnesium castables and aluminum-magnesium spinel castables.
6. Refractory castables for continuous casting
The castables for tundish include: lightweight castables (mainly used for insulation layer), high alumina or mullite self-flowing materials Castables Corundum and magnesia castables (used for the bottom working layer).