1. What business we do for blast furnace
1．Participating the tender for whole blast furnace projects.
2．Provide with whole refractory bricks，insulation materials，machines and equipments for blast furnace projects.
2．The refractory bricks for blast furance
1．Refractory bricks for furnace top and throat
The throat of furnace is mainly used to protect the liners and burden distribution. Its normal work temperature is 400~500℃.The throat area is mainly effected by impact and friction of raw material and the gas atmosphere affects less. Therefore, it is often made by water-cooling or non-cooling steel brick and refractory castables between non-cooling steel brick and shell of furnace.
The metal firmware and sprayed refractory added by anti wearing materials are used in obturation of furnace top.
2．Refractory bricks for furnace shaft
Furnace shaft is the main part of blast furnace that plays the part of heating, loading, deoxidization and making slag. It is always impacted by loading and gas. But the temperature is low (400~800℃）in the upper and middle part of furnace and it has no slag forming and endangerment of erosion by slag. This part is impacted by loading, wears out by gas dust and heat shock (reach to 50℃/min) or damaged by inbreak of alkalescency, zinc and carbon aggradations. So the low porosity fire clay bricks and high alumina bricks are used in this part.
The super duty refractory brick that has anti-desquamate and anti wearing is used in this part according to the conditions of harsh operation for large and middle size blast furnace and systems of extending working life times. The Phosphoric acid immersed fireclay bricks are used in the upper shaft and also the silimanite bricks and anti desquamate high alumina bricks are used in middle and upper side of shaft.
Supper duty fire clay bricks, high alumina bricks, corundum bricks,alumina carbon brick and silica carbide bricks are used in the lower part of shaft because this area is not only in high temperature but also is main heat exchange area that having large number of low-melting-forming and dust friction and the alkali metal corrosion. Refractory bricks for this area are required in good slag resistance, anti-alkali, high temperature strength and high wear resistance.
3．Refractory bricks for belly
The belly acts as buffer to coal gas that going up. The loading in the belly revert to slag in portion that makes permeability becomes bad and erosion by slag becomes severity at the same time the erosion by dregs becomes strictness. In addition, the temperature in the belly is as high as 1400~1600℃ and its high temperature radiation becomes severity. The hot gas containing dusts goes up that come in to being strong action of erosion to liner of furnace. The loading like coal coke bring friction and the temperature changes rapidly when hot air pass. The refractory bricks in the belly lay waste badly because the factors mentioned above act together. So the refractory bricks are selected for the belly requires having anti erosion by dregs and anti wash out.
4．Refractory bricks for bosh
The bosh connects crucible and belly in which temperature is higher and in its lower part the temperature is around 1600~1650℃. A lot of medium slag form and begin to drop because of air of high temperature. This part accepts very heavy heat radiation and erosion by slag. The chemistry by alkali metals invading and carbon aggradations becomes prick up. The wash out action by melt from up to down and the hot gas from down to up also becomes prick up. So the bosh is always the key point of working life time for blast furnace. The high anti erosion, wash out resistance and heat shock resistance are required to refractory bricks for bosh. So the corundum bricks, chrome-corundum bricks, silica carbide bricks and nitrogen-silica carbide bricks are used in bosh. The alumina carbon brick is used at large because that have very good heat shock resistance and cheap in price.
5．Refractory bricks for crucible and hearth
The crucible is the place where the molten iron and slag are loaded. A lot of coal gas is produced by burning coal coke that makes early condition of deoxidization in blast furnace. The crucible especially the place with a draught is the place where the temperature is up most (1700~2000℃) and the temperature in hearth is 1450~1500℃. The liner of crucible bears high temperature and erosion by chemical of dregs of iron.  But it mostly erodes by infiltration of molten iron, alkali and zinc. The infiltration of molten iron makes refractory brick going up and the chemical erosion makes the brittle layer of refractory bricks extending that havoc refractory brick in crucible. The anti molten iron erosion, anti molten iron penetrability, anti alkali, cubage stability and suitable thermal conductivity are required to refractory bricks for this place.