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Method for improving blast furnace smelting efficiency of high-aluminum iron ore with high-reactivity coke

A technology for high-reactivity coke and blast furnace smelting, which is applied in the field of iron and steel metallurgy and ironmaking, can solve the problems of not considering the effect of high-reaction coke and the production cost of high-alumina iron ore efficiency in blast furnace smelting, and achieves improved efficiency and comprehensive competition. power, reducing iron production costs, and improving economic and social benefits

Active Publication Date: 2017-02-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not consider how to improve the efficiency of blast furnace smelting high-aluminum iron ore to reduce production costs more, nor does it consider the effects of other high-reaction cokes

Method used

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  • Method for improving blast furnace smelting efficiency of high-aluminum iron ore with high-reactivity coke
  • Method for improving blast furnace smelting efficiency of high-aluminum iron ore with high-reactivity coke
  • Method for improving blast furnace smelting efficiency of high-aluminum iron ore with high-reactivity coke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The high-reactivity coke (A) is made into diced coke with a size of 10mm, which is mixed with the iron-containing charge, and the mixing ratio of the coke is 2.5% of the weight of the iron-containing charge. The reduction and softening droplet test under load was used to simulate the reduction and softening droplet behavior of mixed ore / highly reactive coke dices in a blast furnace, and the test method was the same as in Comparative Example 1. The chemical composition of iron-containing raw materials (sinter, pellets, lump ore) is shown in Table 1, and the basic properties of high-reactivity coke (A) are shown in Table 3. The coke reactivity index CRI is 95%, and the wear resistance Intensity M 10 30%. The test results show that under this condition, the droplet performance index S of the charge is 47.22kPa·℃. Compared with the comparative example, the air permeability of the reflow process is significantly better. After analysis, about 90% of the highly reactive coke ...

Embodiment 2

[0030] The high-reactivity coke (A) is made into diced coke with a size of 10mm, which is mixed with the iron-containing charge, and the mixing ratio of the coke is 1.0% of the weight of the iron-containing charge. The reduction and softening droplet test under load was used to simulate the reduction and softening droplet behavior of mixed ore / highly reactive coke dices in a blast furnace, and the test method was the same as in Comparative Example 1. The chemical composition of iron-containing raw materials (sinter, pellets, lump ore) is shown in Table 1, and the basic properties of high-reactivity coke (A) are shown in Table 3. The coke reactivity index CRI is 95%, and the wear resistance Intensity M 10 30%. The test results show that under this condition, the droplet performance index S of the charge is 60.15kPa·℃, and the air permeability of the reflow process is better than that of the comparative example, but due to the reduction of the mixing amount, the degree of impro...

Embodiment 3

[0032] The high-reactivity coke (B) is made into diced coke with a size of 10 mm, which is mixed with the iron-containing charge, and the mixing ratio of the coke is 2.5% of the weight of the iron-containing charge. The reduction and softening droplet test under load was used to simulate the reduction and softening droplet behavior of mixed ore / highly reactive coke dices in a blast furnace, and the test method was the same as in Comparative Example 1. The chemical composition of iron-containing raw materials (sinter, pellets, lump ore) is shown in Table 1. The basic properties of highly reactive coke (B) are shown in Table 4. The coke reactivity index CRI is 65%. Intensity M 10 is 10.0%. The test results show that under this condition, the droplet performance index S of the charge is 70.30kPa·℃. Compared with the comparative example, the air permeability of the reflow process becomes better. Compared with Example 1, the improvement degree of air permeability is lower, and ab...

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Abstract

The invention discloses a method for improving the blast furnace smelting efficiency of high-aluminum iron ore with high-reactivity coke, and belongs to the field of ironmaking of ferrous metallurgy. The method is characterized in that based on the fact that an ore-coke mixed charging technology is universally adopted in present ironmaking production, and aiming at the problems of low breathability, wide soft melting interval and difficulty in slag and iron separation in blast furnace smelting of the high-aluminum iron ore, the high-reactivity coke is adopted to replace the conventional metallurgical coke to be made into coke nut which is fed in a blast furnace, and owning to the high reactivity of the coke nut, the temperature of a heat reserve area can be lowered, the pre-reduction degree of ferrous furnace charge is increased, the FeO content of primary slag containing Al2O3 is reduced, the melting point of the slag containing Al2O3 is increased, the melting interval is narrowed, a soft melting belt moves down, and the breathability of a material layer is further improved on the base of ore-coke mixed charging, so that the purpose of improving the blast furnace smelting efficiency of the high-aluminum iron ore is achieved. The method provided by the invention is conducive to utilization of inferior iron ore and inferior coke resources, reduces the ironmaking production cost of a steel-iron enterprise, guarantees the production efficiency of ironmaking, and has high economic and social benefits.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and ironmaking, and in particular relates to a method for improving the efficiency of blast furnace smelting high-aluminum iron ore by using high-reactivity coke. Background technique [0002] Due to the limited iron ore resources and the gradual increase in the consumption of high-grade iron ore, Al in iron ore 2 o 3 content showed a gradual increasing trend. Although these changes were relatively slow, they still caused problems for blast furnace operation. When Al in the sintered material 2 o 3 When the content is increased by a small amount, the strength and low-temperature reduction pulverization performance of sintered ore may be deteriorated, which may lead to poor air permeability in the upper part of the blast furnace. It is also possible to change the composition and properties of the primary slag formed during sintering near the reflow zone, thereby negatively affecting the...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/007
Inventor 王广王静松薛庆国
Owner UNIV OF SCI & TECH BEIJING
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