Raw material for blast furnace smelting and blast furnace smelting method

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

Inactive Publication Date: 2017-08-25
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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  • Raw material for blast furnace smelting and blast furnace smelting method
  • Raw material for blast furnace smelting and blast furnace smelting method
  • Raw material for blast furnace smelting and blast furnace smelting method

Examples

Experimental program
Comparison scheme
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 and low-magnesium blast furnace smelting raw material and a method for using the charge for high-aluminum and low-magnesium blast furnace smelting, wherein the charge is composed of high-aluminum and low-magnesium sintered ore, pellets and raw ore, and the blast furnace No magnesium-containing ore is added to the burden. The high-alumina and low-magnesium sintered ore is sintered from a mixture of high-aluminum and low-magnesium iron ore powder and sintering auxiliary materials. The pellets are ordinary pellets. The raw ore It is a high-grade iron ore concentrate. The present invention selects high-alumina and low-magnesium sintered ore and ordinary pellets in the blast furnace smelting process, and rationally mixes raw ore. By selecting a suitable blast furnace operation system, the gas flow distribution in the blast furnace smelting process is reasonable, and the performance of the blast furnace slag is good. The smooth discharge of iron keeps the blast furnace running smoothly and reduces the cost of pig iron smelting.

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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Patent Type & Authority Patents(China)
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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