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A high-proportion pellet blast furnace ironmaking method

A blast furnace ironmaking and pelletizing technology, applied in the blast furnace, blast furnace details, blast furnace parts, etc., can solve the problems of poor thermal stability of blast furnace, high metallurgical comprehensive performance, wind suffocation, etc., to accelerate the process of reduction and softening of molten droplets , Improve economic benefits, increase the effect of indirect reduction

Active Publication Date: 2022-04-29
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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  • A high-proportion pellet blast furnace ironmaking method
  • A high-proportion pellet blast furnace ironmaking method
  • A high-proportion pellet blast furnace ironmaking method

Examples

Experimental program
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Effect test

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

A blast furnace ironmaking method with a high proportion of pellets. The ore material composed of iron-containing charge, coke and limestone is sent to the blast furnace from the furnace top. The iron-containing charge includes pellets and sintered ore, wherein the proportion of pellets 65-75%; the mass fraction of iron-containing charge in the ore charge is 75-80%, the mass fraction of coke is 20-25%, and the mass fraction of limestone is 0-0.5%. By adopting the method of the invention, the proportion of pellets in the iron-containing charge of the blast furnace ironmaking can be increased to 65%-75%, and the smooth operation of the blast furnace can be ensured, and the production energy consumption is low, the waste gas emission is low, and the economy of the blast furnace ironmaking can be improved. benefit features.

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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Patent Type & Authority Patents(China)
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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