Brown Aluminium Oxide Grit Manufacturers Belarus

The initial conditions for the reduction and manufacturing of the blast furnace, the hearth, especially the tuyere area, are the areas with the highest temperature in the blast furnace(46 grit aluminum oxide). The temperature is above 1700 ~ 2000 ℃, and the bottom temperature is generally within 1450 ~ l500c(white fused alumina for refractory). In addition to the high temperature, the hearth lining is mainly eroded and scoured by slag iron, and the bottom is mainly eroded by infiltration of molten iron.

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The hearth is the place where the molten iron and slag are contained, and the coke is burned to produce a large amount of gas(brown fused alumina). Two typical patterns of hearth erosion. Although the blast furnace is developing towards large scale, the material and structure of furnace bottom are different, but the comprehensive furnace bottom is still used more, especially in the United States, Japan, starved rose and China and other countries(green carborundum).

Permeability, thermal conductivity, chemical resistance, etc. with the help of cooling effect of cooling wall(pink corundum). The 1150C isotherm (solidification line of molten iron) is pushed to the center as far as possible, and a protective "flooded skin" or "iron shell" can be formed on the hot surface of the carbon brick, so as to prevent the carbon brick from being damaged by chemical infiltration, scouring and thermal stress, so as to extend its service life(aluminum oxide blast media 60 grit).

Therefore, the most important thing is that the carbon brick should have excellent impermeability and high thermal conductivity(brown aluminum oxide). According to Russian experience, when the bottom of 1513m blast furnace is not cooled, the erosion depth is about 1950mm, when there is cooling, it is about 700mm(glass beads supplier). The United States, Japan and China have successively used clay brick (or high aluminum brick) - carbon brick to build the comprehensive furnace bottom.

Therefore, the erosion of hearth and bottom is mostly garlic like or pan like(silicon carbide price). The production practice shows that the high thermal conductivity carbon brick is laid on the hearth wall, the lower layer of furnace bottom and the surrounding area, and the aluminum silicate refractory brick is laid on the middle part of the upper layer of furnace bottom, and the cooling facilities are strengthened(black oxide aluminum). The application effect is good and it has been widely used. 

The furnace was ignited in November 1978, with a maximum daily output of 8741t(brown aluminium oxide). It has been put into operation for 14 months, producing nearly 4 million tons of iron, and the equipment is in normal operation. For example, the hearth diameter of No. 5 blast furnace in Fukuyama plant, Japan is 14.4m(fused alumina), and the furnace bottom is composed of two layers of clay bricks, three layers of flat bricks and one layer of vertical carbon bricks from top to bottom. 

The furnace bottom thickness is 4.8m(white alumina). In general, American blast furnaces use full carbon brick bottom (such as 3680m blast furnace in America), air-cooled bottom and air duct to vibrate and make carbon materials. After leveling, four layers of carbon bricks are laid. The total thickness of furnace bottom is 3500mm(silicon carbide companies). The hearth wall is made of carbon bricks with a thickness of 991mm and the tuyere area is 914mm.

In order to enhance the heat transfer effect of furnace bottom, graphite brick is generally used as the cooling layer at the bottom of large and medium-sized blast furnaces in Western Europe(black corundum). Bottom structure and temperature distribution of No.3 BF in lanwayne plant, UK. The thermal conductivity of carbon brick used in the furnace is about 1980kj / m · h · C, and the total thickness of furnace bottom is 2.4m, and carried out different structural tests(arc fused alumina).