Refractory gunning material for inner lining maintenance of blast furnace
Refractory gunning material for inner lining maintenance of blast furnace
The unshaped refractory material used when repairing the lining of thermal equipment by spray construction method is called refractory gunning material. It is made of a refractory set with a certain particle gradation
Refractory gunning material for inner lining maintenance of blast furnace
The unshaped refractory material used when repairing the lining of thermal equipment by spray construction method is called refractory gunning material. It is composed of refractory aggregates with certain particle gradation, chemical binders and additives, and is generally a thermosetting or gas-hardening material. The selection of the main material is based on the maximum temperature fluctuation range that may be reached in the kiln, the properties of the slag, and the material of the lining itself.
The particle size composition and limit particle size of the gunning material and the spraying layer should be determined according to the structure of the gunning machine, the thickness of the gunning layer and different gunning methods. Improper selection of particle size or unreasonable particle gradation have a great influence on the adhesion of gunning material and the density of the gunning layer. Under normal circumstances, the wet and dry spraying particles are too coarse and too many particles will lead to a decrease in the adhesion rate. Generally, the multi-critical particle size of the dry gunning material is larger than that of the wet spray gunning material, and sometimes it can reach 6~7mm or even larger. Fire spray gunning material is divided into wet method (mud method) gunning material, semi-dry method (nozzle mixing type) gunning material and flame method (melting method) gunning material according to the construction method: according to the main material of the gunning material Divided into magnesia, magnesia-calcium, magnesia-chromium, magnesia-carbon, aluminum silicate and alumina-silicon-oxide-carbon gunning materials, etc.: according to the conditions of use, it is divided into gunning materials for converters and gunning for electric furnaces material, gunning material for ladle, gunning material for vacuum degassing furnace (RH, DH), gunning material for tapping ditch and gunning material for blast furnace lining, etc.
Acid resistant refractory gunning material is used for spraying of blast furnaces, hot blast stoves, hot blast pipes, flue protection layers, working layers, etc.
Refractory wet mud used to block the iron outlet can be divided into two categories: water cannon mud and waterless gun mud. On large and medium -sized blast furnaces on high top pressure and high degree of smelting.
Coke furnace silicon bricks are mainly used in the heat storage room, oblique road, charcoal room, combustion room, top of the furnace, and bottom of the furnace.
High alumina brick is one of the indispensable basic refractory materials in the upper and middle parts of blast furnace body in iron and steel industry