The blast furnace part is divided into throat, furnace body, hearth and hearth. With the large-scale blast furnace, the refractory materials used in various parts of the furnace lining have higher requirements, and the materials used for the lining also become stable, dense, wear-resistant and anti-erosion. Aspect to improve.
There are many types of refractory materials for blast furnace linings, and blast furnace lining is also a continuously improving technology. The spraying lining combined with cement has evolved into a lining material combined with silica sol. Although domestic manufacturers of silica sol combined lining materials are also Just a few, but technological progress is unstoppable.
The throat of the blast furnace is directly impacted and rubbed by the charge, but the temperature is not very high. You can use dense clay bricks, high alumina bricks, clay castables, or spray paint for masonry.
The furnace body part is very severely scoured by materials and high-temperature air flow, and is damaged by the scouring of rising dust and carbon deposits. Dense clay bricks and high alumina bricks are used in the middle and upper parts.
It can also be built with phosphorous bricks or high alumina bricks and sillimanite bricks; the lower part of the furnace body is built with dense clay bricks, high alumina bricks, corundum bricks, and silicon carbide bricks.
The furnace belly is severely corroded by iron slag.
In addition, high temperature, scouring and other comprehensive factors, the use of refractory materials is seriously damaged, and low-porosity clay bricks, high alumina bricks, graphite bricks, silicon carbide bricks, corundum bricks, etc. are used for masonry.
The hearth is the place where the molten iron and the molten slag are loaded. The maximum temperature is about 2000℃, and the temperature of the furnace bottom is about 1500℃.
In addition to being affected by high temperature, the hearth lining is also eroded by slag and iron. The tuyere of the hearth is made of corundum mullite bricks and brown corundum bricks for masonry.
The slag-iron contact hot surface uses corundum mullite bricks and brown corundum bricks. The cold surface uses dense carbon bricks, graphite semi-graphite carbon bricks, and micropores. Carbon bricks and molded carbon bricks are used for masonry, the sidewalls are made of brown corundum low cement prefabricated blocks, the hearth is hot-pressed small carbon bricks, the hearth is made of graphite semi-graphite carbon bricks, microporous carbon bricks, and the hearth and the furnace wall Fill the space with anhydrous pressure into the mud.
Clay bricks, silicon carbide bricks, graphite bricks, fused corundum castables, silicon carbide castables, iron ditch thermal spray repair materials are used for blast furnace tapholes, and low cement and high aluminum castables are used for the ditch cover.
The skimmer part uses low cement corundum castable, the swing nozzle is similar to the iron ditch, and the slag-out ditch can use baking-free castable.
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