Furnace burden structure ratio for adjusting blast furnace slag MgO

Abstract

The invention is applicable to the technical field of blast furnace slag and provides a furnace burden structure ratio for adjusting blast furnace slag MgO. A blast furnace smelting furnace burden iscomposed of low-MgO sintering ores, pellet ores, lump ores and additional dolomite, wherein the furnace burden structure ratio (%) is shown as follows: 65.77% of low-MgO sintering ores, 20% of lump ores, 14.23% of pellet ores, and additionally 4% of dolomite blocks of 10-40 mm for supplementation. According to different blast furnaces and different furnace burden structures, the MgO content of furnace slag has an appropriate range, and the MgO content does not mean the higher the batter or the lower the better. For this reason, the MgO content of the furnace slag is adjusted not through the MgO content of the sintering ores, but through the blast furnace burden structure; the MgO content of the sintering ores is stabilized, and technical-economic indexes such as the sintering ore quality and the metallurgical performance are stabilized and improved; the MgO content of the blast furnace slag can be accurately adjusted in time, and the requirement for the fluidity of the blast furnace slag is met, the desulfuration and dealkalization capability of the furnace slag is improved, and the softening-melting properties of the furnace slag are improved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace slag, and in particular relates to a method for adjusting the furnace charge structure ratio of blast furnace slag MgO. Background technique [0002] MgO is an important component of blast furnace slag, which is essential. Its role is to effectively improve the fluidity and stability of slag, improve the desulfurization and dealkali ability of slag, inhibit the circulation of alkali metals in the blast furnace, reduce the enrichment, and the content of MgO in blast furnace slag It is brought in by sintering ore, pellet ore, lump ore, coke, and coal powder, and the content of MgO brought in by sintering ore accounts for more than 90%. [0003] The current methods of adjusting MgO content in blast furnace slag have the following disadvantages: blast furnace slag MgO / Al 2 o 3 When the ratio is inappropriate, it is necessary to adjust the MgO content of the sintered ore. To adjust the MgO cont...

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Problems solved by technology

[0003] The current methods of adjusting MgO content in blast furnace slag have the following disadvantages: blast furnace slag MgO / Al 2 o 3 When the ratio is inappropriate, it is necessary to adjust the MgO content of the sintered ore. To adjust the MgO content of the sintered ore, one needs to adjust the ratio of other materials at the same time, which affects the fluctuation of the alkalinity and chemical composition of the sintered ore. The second is to adjust the MgO content of the sintered ore. From adjusting the sinter ratio to using the adjusted sinter in the blast furnace, it takes at least 10 hours, and at most it takes more than 16 hours

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