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Method for large-proportion utilization of lump ores for blast furnace

A blast furnace, high-temperature technology, applied in the field of large-scale use of lump ore in blast furnaces, can solve problems such as the deterioration of economic and technical indicators of blast furnaces, hinder the development of edge airflow, and the bonding of blast furnace body, achieve good air permeability index, reduce furnace charge The cost of raw materials and the effect of reducing the energy consumption of the blast furnace

Active Publication Date: 2018-08-17
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 the proportion of blast furnace lump ore entering the furnace increases, and the proportion of pellet ore entering the furnace decreases or even reaches zero, the position of the blast furnace refractory zone will move up, which will easily cause the blast furnace body to stick, hinder the development of edge airflow, reduce the blast furnace air volume, and make the operation difficult. Deterioration of economic and technical indicators

Method used

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  • Method for large-proportion utilization of lump ores for blast furnace
  • Method for large-proportion utilization of lump ores for blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The softening temperature of No. 4 blast furnace sinter in a domestic ironworks is 1226℃, the softening end temperature is 1351℃, and the softening temperature range is 125℃;

[0040] The No. 4 blast furnace has 9 tons of Australian blocks and 1 ton of coke diced, and the two are fully mixed.

[0041] The conventionally adopted batch weight for No. 4 blast furnace is 60t;

[0042] The No. 4 blast furnace adopts the method of feeding lump ore into the furnace in batches, and the order of distribution is: coke, sintering + jaw balls, Australian lumps + coke;

[0043] The No. 4 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 here represents sintering + jaw ball, K is Australian block + coke, the number on the upper right is the corner position of the cloth, and the number on the lower right is the number of cloth rings corresponding to the number on the upper right. When coke is pl...

Embodiment 2

[0046] The softening temperature of No. 4 blast furnace sinter in a domestic ironworks is 1227°C, the softening end temperature is 1345°C, and the softening temperature range is 118°C; the softening temperature of Australian block is 1053°C, the softening end temperature is 1239°C, and the softening temperature range is 186°C;

[0047] The No. 4 blast furnace has a charge of 12 tons of Australian lumps and 0.8 tons of coke dices, and the two are fully mixed.

[0048] The conventionally adopted batch weight for No. 4 blast furnace is 60t;

[0049] The No. 4 blast furnace adopts the method of feeding lump ore into the furnace in batches, and the order of distribution is: coke, sintering, Australian lump + coke;

[0050] The No. 4 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 here stands for sintering, K is Australian block + coke, the upper right number is the cloth corner position, and ...

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Abstract

The invention discloses a method for the large-proportion utilization of lump ores for a blast furnace. The method comprises the following steps: step 1, testing the high-temperature metallurgy performance of the lump ores to be put into the blast furnace, and selecting the condition-satisfied lump ores; step 2, sufficiently mixing the selected lump ores with nut coke at a mass ratio of (6-25):1,so as to obtain a mixture; and step 3, adding the mixture obtained in step 2 into a middle ring belt of the blast furnace at a mass ratio of the consumption of the lump ores in each batch of furnace charge to each batch of the furnace charge, putting the furnace charge into the blast furnace, and carrying out smelting, wherein the mass ratio is set to (1-3):10. According to the method disclosed bythe invention, the lump ores are put into the blast furnace in batches, so that the proportion of the lump ores being put into the blast furnace can be extremely improved under the premise that the stable and smooth running of the blast furnace is guaranteed; the lump ore and nut coke mixing ratio as well as other parameters are optimized, so that the high permeability index of the mixture can beachieved and the problem about a decrease in the coal gas efficiency of the blast furnace can be solved; and furthermore, the time for coal gas to stay in the blast furnace can be prolonged, the coalgas utilization efficiency of the blast furnace can be improved, the energy consumption of the blast furnace can be lowered, and the cost of raw materials being put into the blast furnace can be greatly reduced.

Description

technical field [0001] The invention relates to a blast furnace smelting method, in particular to a method for using lump ore in a large ratio in a blast furnace, and belongs to the technical field of metallurgy. Background technique [0002] Modern blast furnace ironmaking raw materials include sinter, pellets, lump ore and other iron-containing raw materials. At present, the proportion of sinter in large blast furnaces generally reaches about 70%. Because sinter is an alkaline iron-containing raw material, blast furnaces often need to use a certain proportion of acidic iron-containing raw material pellets and lump ore in order to ensure the slagging system. Among them, the grade of lump ore mainly used in blast furnaces often exceeds 60%. For example, the lump ore mainly used in some ironmaking plants is South African lump and Australian lump, whose iron content is close to or even exceeds that of pellets (E ball, Cheng ball), as shown in the table 1. With the implementa...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 李红陈令坤胡正刚
Owner 武汉钢铁有限公司
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