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Blast furnace iron-making raw material and blast furnace iron-making method

A blast furnace smelting and charging technology, which is applied in the fields of high-aluminum and low-magnesium blast furnace smelting and high-aluminum and low-magnesium blast furnace smelting raw materials, can solve the problems of high cost of blast furnace ironmaking and low smelting performance.

Inactive Publication Date: 2015-04-22
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low smelting performance and high cost of blast furnace ironmaking in the prior art

Method used

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  • Blast furnace iron-making raw material and blast furnace iron-making method
  • Blast furnace iron-making raw material and blast furnace iron-making method
  • Blast furnace iron-making raw material and blast furnace iron-making method

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Experimental program
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Effect test

Embodiment 1

[0037] The blast furnace smelting charge required for blast furnace smelting in this embodiment includes, by weight percentage: 82% of high-alumina and low-magnesium sintered ore, 10% of pellet ore and 8% of raw ore. For the furnace capacity is 3200m 3 blast furnace with 36 tuyeres and an area of ​​0.4035m2 2 . The kinetic energy of the blast furnace blast is controlled at 155kJ / s, and the air volume is controlled at about 5900m 3 / min, the wind speed control is 285m / s. The blast oxygen enrichment rate is controlled at 2.7%. Blast air temperature is controlled at 1200°C. The heat of molten iron is controlled at 1520°C. The charging system of opening the center and suppressing the edge is adopted. The ore batch weight is 105t, the depth of the material line is 1.4m, and the material speed is 5.5 batches / hour. The tapping time is 100min, the tapping flow rate is 5.8t, and the slag seeing rate is 90%. The mass percentage of pig iron Si is 0.41%, and the slag Al 2 o 3 The...

Embodiment 2

[0045] The blast furnace smelting charge required for blast furnace smelting in this embodiment includes, by weight percentage: 80% of high-alumina and low-magnesium sintered ore, 8% of pellet ore and 12% of raw ore. For the furnace capacity is 3200m 3blast furnace with 36 tuyeres and an area of ​​0.415m2 2 . The kinetic energy of the blast furnace blast is controlled at 150kJ / s, and the air volume is controlled at about 6050m 3 / min, the wind speed control is 280m / s. The blast oxygen enrichment rate is controlled at 3%. Blast air temperature is controlled at 1200°C. The heat of molten iron is controlled at 1520°C. The charging system of opening the center and suppressing the edge is adopted. The ore batch weight is 110t, the depth of the material line is 1.4m, and the material speed is 5.5 batches / hour. The tapping time is 110min, the tapping flow rate is 6.0t, and the slag seeing rate is 90%. The mass percentage of pig iron Si is 0.41%, and the slag Al 2 o 3 The con...

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Abstract

The invention provides a high-aluminum low-magnesium blast furnace iron-making raw material and a method for high-aluminum low-magnesium blast furnace iron-making by using the high-aluminum low-magnesium blast furnace iron-making raw material. The high-aluminum low-magnesium blast furnace iron-making raw material consists of high-aluminum low-magnesium sintered ore, pellet ore and raw ore; the blast furnace material is free of magnesium-containing ore; the high-aluminum low-magnesium sintered ore is prepared from a mixture of high-aluminum low-magnesium iron ore powder and auxiliary sintering materials in a sintering way; the pellet ore is ordinary pellet ore; the raw ore is high-grade iron ore concentrate. In the blast furnace iron-making process, the high-aluminum low-magnesium sintered ore and the ordinary pellet ore together with reasonably added raw ore are adopted, and appropriate blast furnace operation mechanisms are selected, so that the coal gas flow can be reasonably distributed in the blast furnace iron-making process, the blast furnace slag is good in property, the slag iron can be smoothly discharged, stable and smooth operation of a blast furnace is maintained, and the pig iron making cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of iron and steel making, and in particular relates to a high-aluminum and low-magnesium blast furnace smelting raw material and a method for using the furnace charge to carry out high-aluminum and low-magnesium blast furnace smelting. Background technique [0002] In recent years, the proportion of imported ore in ironmaking raw materials has been increasing, and blast furnace Al 2 o 3 Load climbs, A1 in slag 2 o 3 The content also increases accordingly, resulting in poor fluidity of slag, decreased desulfurization ability, increased coke ratio, and difficult operation. To accommodate high Al 2 o 3 According to the smelting conditions, the MgO content in the slag needs to be adjusted appropriately. Most domestic blast furnaces add magnesium-containing ores during sintering or smelting, and generally control the MgO content in the slag to more than 8%, and the magnesium-aluminum ratio is about 0.7. ...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 刘元意蒋学健刘汉海王云术汤登军郭新超张惠包卫华弭希雨杨雷房盼盼
Owner SHANDONG IRON & STEEL CO LTD
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