Blast Furnace Lining
The blast furnace is made of steel plate with refractory brick lining inside.
From top to bottom, the blast furnace body is divided into 5 parts: furnace throat, furnace shaft, furnace waist, furnace bosh, and furnace hearth. Due to the advantages of good technical and economic indicators, simple process, large production capacity, high labor production efficiency, and low energy consumption, the iron produced by this method accounts for the vast majority of the world's total iron output.
Blast Furnace Lining
A layer of 345 ~ 1150mm thick refractory bricks is laid inside the blast furnace shell to reduce the heat dissipation of the furnace shell. Cooling equipment is set in the bricks to prevent the furnace shell from deformation.
The damage mechanism of each part of the blast furnace brick lining is different. In order to prevent the local brick lining from being damaged first and shorten the service life of the blast furnace, different refractory brick lining must be selected according to the factors such as damage, cooling, and blast furnace operation.
The hearth and bottom traditionally use high-grade and super high-grade clay bricks. This part of the bricks gradually melted away. Due to shrinkage and poor bricklaying quality, major burn-through accidents were often caused in the past. Carbon refractories are mostly used for hearth and bottom, basically solving the burn through the problem of furnace bottom.
There are three types of carbon bricks used in furnace bottom: all are carbon bricks; Around and above the furnace bottom are carbon bricks, and the lower part is clay bricks or high alumina bricks; Around and below the furnace bottom are carbon bricks, and the upper part is clay bricks or high alumina bricks. The latter two are also called integrated furnace bottoms.
The design furnace bottom thickness tends to decrease (from 0.5d to about 0.3d or 1/4 of the furnace shell inner diameter, D is the hearth diameter).
The disadvantage of carbon bricks is that they are easily eroded by air, carbon dioxide, water vapor, and alkali metals. The furnace waist, especially the brick lining at the lower part of the furnace body, is easy to be damaged due to wear, thermal stress, chemical erosion, etc.
When the blast furnace with cooling staves is put into operation for about two years, the brick lining at the lower part of the furnace body is often eroded. The upper part of the furnace body and the furnace throat brick lining shall be made of materials with abrasion resistance and thermal stability, and the clay brick is preferred. After the bosh brick lining is eroded, the production is maintained by "slag skin".
In recent years, the application of gunning technology to repair brick lining has been quite common. Gunning high alumina refractory (including Al2O3 340 ~ 60%), with a service life of 3/4 of that of the lining.
The main products of Hani Metallurgy are: electric arc furnace, LF ladle refining furnace, electro slag furnace, submerged arc furnace, metallurgical electric furnace short network system, submerged arc furnace short network system, water-cooled cable, bare copper stranded wire air-cooled cable, rotatable water-cooled cable , high-current copper tube busbar, insulated copper tube busbar, copper-steel composite conductive cross arm, water-cooled compensator, water-cooled furnace cover, water-cooled furnace shell, water-cooled furnace wall, fully enclosed combined handle, direct-cooled forged copper tile, electrode Chuck, electrode holding ring, pressure ring, hydraulic brake, collector ring, conductive element, ladle, tundish, ladle car, cross flat car, steel pouring car, furnace door water-cooled carbon-oxygen gun, furnace wall speed oxygen collector Electric furnace accessories such as guns, ladles, scrap steel tanks, ladle roasters, ladle gantry hooks, water-cooled cable jacket hoses, jacket protection rings and insulating materials.