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A Method of Adding Steel Scrap in Large Proportion to Blast Furnace

A blast furnace and steel scrap technology, which is applied in the field of iron and steel smelting, can solve the problems of poor economic and technical indicators of blast furnaces, hinder the development of edge airflow, and bond the blast furnace body, achieve good air permeability index, small distribution influence, and reduce blast furnace energy consumption Effect

Active Publication Date: 2020-10-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a large proportion of blast furnace scrap steel is put into the furnace, the structure of the blast furnace charge changes, thereby changing the position of the blast furnace reflow zone, which may easily cause the blast furnace body to stick, hinder the development of edge airflow, reduce the blast furnace air volume, make operation difficult, and the economic and technical indicators of the blast furnace will deteriorate

Method used

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  • A Method of Adding Steel Scrap in Large Proportion to Blast Furnace
  • A Method of Adding Steel Scrap in Large Proportion to Blast Furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A domestic ironmaking A blast furnace (2516m 3 )

[0047] Step 1: Add scrap steel bucket and scrap steel weighing bucket in the open place under the tank, and add belt 1 and belt 2 respectively between the scrap steel bucket and scrap steel weighing bucket, and between the scrap steel weighing bucket and the main belt;

[0048] Step 2: A blast furnace crushed steel scrap load is 4.9t, coke is loaded with 0.8t, and the two are fully mixed; the scrap steel is transported from the scrap steel hopper to the scrap steel weighing hopper through the additional belt 1, and then through the additional belt 2 directly onto the main belt;

[0049] A blast furnace usually adopts a batch weight of 70t;

[0050] Step 3: Blast furnace A adopts the method of feeding lump ore into the furnace in batches, and the order of distribution is: coke, sintering + jaw ball + South African block, scrap steel + coke diced; the ratio of scrap steel consumption to ore batch mass is 7:100;

[0051...

Embodiment 2

[0054] A domestic ironmaking A blast furnace (2516m 3 )

[0055] Step 1: Add scrap steel bucket and scrap steel weighing bucket in the open place under the tank, and add belt 1 and belt 2 respectively between the scrap steel bucket and scrap steel weighing bucket, and between the scrap steel weighing bucket and the main belt;

[0056] Step 2: The amount of crushed blast furnace steel scrap is 10.5t, and the amount of coke is 1.5t. The two are fully mixed; added to the main belt;

[0057] A blast furnace usually adopts a batch weight of 70t;

[0058] Step 3: Blast furnace A adopts the method of feeding lump ore into the furnace in batches, and the order of distribution is: coke, sintering + jaw ball + South Africa block, scrap steel + coke diced; the ratio of the amount of scrap steel to the mass of ore batch is 3:20;

[0059] A blast furnace adopts the distribution matrix from the outer ring to the inner ring, and the charging matrix is: Among them, C is coke, O is sinter...

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Abstract

The invention discloses a method for adding waste steel into a blast furnace in a large proportion. The method comprises the following steps that S1, two belts, a waste steel hopper and a waste steelweighing hopper are added on a blast furnace, and the waste steel are directly conveyed to a blast furnace main belt; S2, the waste steel and coke powder are fully mixed according to the mass ratio of4:1 to 10:1 to obtain a mixture; S3, the mass ratio of the amount of waste steel to the batch weight of ore in each batch of the furnace burden is 1:20 to 3:20, then the mixture obtained in the step2 is added into a middle ring belt of the blast furnace according to the mass ratio, and smelting is carried out in the furnace. According to the method, the blast furnace waste steel feeding ratio isgreatly improved while the stable operation of the blast furnace is ensured, the furnace feeding ratio can reach 7 wt%-15 wt%, and the yield of the blast furnace is improved; and the utilization efficiency of blast furnace gas is effectively improved, the consumption of blast furnace fuel is reduced, and the emission of blast furnace CO2 is further reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for adding scrap steel in a large proportion to a blast furnace. Background technique [0002] Since 2018, the environmental protection pressure of steel companies has increased sharply. The Ministry of Environmental Protection announced that starting from October 1, 2018, 28 cities in Beijing, Tianjin and Hebei will implement special emission limits for air pollutants, and most provinces and cities will follow up and introduce more stringent environmental protection standards. [0003] Blast furnace ironmaking is to pile up the charge in the furnace into a columnar shape, which is continuously heated, decomposed, reduced, softened, melted, dripped, and finally formed into a slag-iron melt and separated by the action of the high-temperature reducing airflow upstream. . Modern blast furnace ironmaking raw materials mainly include sinter, pellets, lump or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC21B5/007C21B5/008Y02P10/20
Inventor 李红李勇波陈令坤黄立准孙北京肖志新胡正刚余珊珊卢正东刘栋梁
Owner 武汉钢铁有限公司
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