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Blast furnace ironmaking method for high-proportion pellets

A blast furnace ironmaking and pelletizing technology, applied in blast furnace, blast furnace details, blast furnace parts and other directions, can solve the problems of poor thermal energy utilization, collapsed material, increased suspended material, and high expansion rate

Active Publication Date: 2021-01-26
德龙钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of pellets are high expansion rate and easy pulverization, and the comprehensive metallurgical performance of sintered ore is higher than that of pelletized ore.
During the blast furnace smelting process with high proportion of pellets, there will be obvious material segregation, and at the same time, there will be wind suffocation, and there will be more collapsed and suspended materials, and frequent pipeline strokes will cause raw materials to fall into the furnace without sufficient preheating and reduction. Cylinder, resulting in lower blast furnace hearth temperature, poor thermal energy utilization, and due to poor thermal stability of the blast furnace, the upper part of the furnace often nodules

Method used

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  • Blast furnace ironmaking method for high-proportion pellets
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  • Blast furnace ironmaking method for high-proportion pellets

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Experimental program
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Embodiment 1

[0025] Embodiment 1: In the blast furnace smelting process, the ore material composed of iron-containing charge, coke and limestone is sent into the blast furnace from the top of the furnace. The iron-containing charge includes pellets and sintered ore, wherein the proportion of pellets is 70%; the ore The mass parts of iron-containing furnace materials in the feed are 75 parts by mass, the parts by mass of coke are 25 parts by mass, and the parts by mass of limestone are 0.5 parts by mass.

[0026] The bosh angle β of the blast furnace is 75.5°, A is 1.4°, B is 0.9A=1.26°, and α is calculated from formula 1 to be 85.39°.

[0027] The oxygen enrichment rate is 12%, and the amount of coal injection in the blast furnace ironmaking process is 180kg / tHM; mixed pulverized coal is used for injection, and the proportion of bituminous coal in the mixed pulverized coal is 50%; Gas 60m3 / tHM, coke ratio control 300kg / tHM.

Embodiment 2

[0028] Embodiment 2: In the blast furnace smelting process, the ore material composed of iron-containing charge, coke and limestone is sent into the blast furnace from the top of the furnace. The iron-containing charge includes pellets and sintered ore, wherein the proportion of pellets is 78%; the ore The mass fraction of iron-containing charge in the material is 78, and the mass fraction of coke is 22.

[0029] The bosh angle β of the blast furnace is 76°, A is 1.2°, B is 0.92A=1.104°, and α is calculated from formula 1 to be 83.88°.

[0030]The oxygen enrichment rate is 13%, and the amount of coal injection in the blast furnace ironmaking process is 190kg / tHM; mixed pulverized coal is used for injection, and the proportion of bituminous coal in the mixed pulverized coal is 70%; Gas 60m3 / tHM, coke ratio control 315kg / tHM.

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Abstract

The invention relates to a blast furnace ironmaking method for high-proportion pellets. Mineral aggregates comprising an iron-containing furnace charge, coke and limestone are fed into a blast furnacefrom the top of the furnace, and the iron-containing furnace charge comprises the pellets and sintered ore, wherein the proportion of the pellets is 65 to 75%; and the mineral aggregates comprise 75to 80 parts by mass of iron-containing furnace charge, 20 to 25 parts by mass of coke and 0 to 0.5 part by mass of limestone. By adopting the method provided by the invention, the proportion of the pellets in the iron-containing furnace charge for blast furnace ironmaking can be increased to 65% to 75%, and stable operation of a blast furnace can be guaranteed; and the method has the characteristics of low production energy consumption, low waste gas emission and capability of improving economic benefits of blast furnace ironmaking.

Description

technical field [0001] The invention relates to a metallurgical ironmaking technology, in particular to a high-proportion pellet blast furnace ironmaking method. Background technique [0002] Blast furnace ironmaking charge is composed of sinter, pellets and lump ore. At present, the proportion of blast furnace ironmaking pellets is generally less than 18%, and the proportion of ironmaking pellets in individual iron and steel enterprises can reach 26%, but there are few blast furnace ironmaking that maintain a high pellet proportion of more than 55% for a long time technology. The main exhaust gas source of the pelletizing process is about 50% lower than that of sintering ore, and the production energy consumption is about 2 / 3 of that of sintering ore. Based on the requirements for energy saving and consumption reduction and the continuous improvement of environmental protection indicators, the use of high-proportion pellet technology in blast furnace ironmaking is the dir...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B7/00
CPCC21B5/008C21B7/00C21B5/003
Inventor 张军红佘雪峰王晓光王静松李丽红王广王艾军刘佳坤朱红芳
Owner 德龙钢铁有限公司
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