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Batching method for banking up large-scale blast furnace

A blast furnace, large-scale technology, applied in the field of batching of large-scale blast furnace sealing furnace, can solve the problems such as unsatisfactory ore reducibility, and achieve the effect of good reducibility, favorable furnace start-up and stable furnace condition

Inactive Publication Date: 2015-08-26
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

However, in actual production, it was found that there was a problem that it could not satisfy the reducibility of ore, and because they all used sintered ore as the furnace sealing material, and the Al of sintered ore 2 o 3 Compared with pellet ore, it is high, so improving the fluidity of iron slag can not meet the needs of higher requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 The effective volume of the blast furnace in this embodiment is 2200m 3 :

[0029] Its blast furnace batching and furnace sealing steps:

[0030] 1) Manganese ore was added 71 hours before the blast furnace was shut down to seal the furnace, and the amount added was such that the weight percentage of Mn in the pig iron was 0.63%;

[0031] 2) 6.5 hours before the wind break, load materials according to the following levels, and make the loaded amount fill up the furnace hearth, furnace bosh and all parts above the furnace body respectively during the wind break:

[0032] (1) Load coke in such an amount that the furnace hearth is filled before the wind is shut off;

[0033] (2) Load coke and manganese ore mixture, of which manganese ore is calculated according to the effective volume of blast furnace every 300m 3 Load 0.81 tons, and the rest is coke; the principle is to fill the bosh with the amount of mixture;

[0034] (3) Load the empty material, the co...

Embodiment 2

[0043] Example 2 The effective volume of the blast furnace in this example is 1536 m 3 :

[0044] Its blast furnace batching and furnace sealing steps:

[0045] 1) Manganese ore was added 69 hours before the blast furnace was shut down to seal the furnace, in such an amount that the weight percentage of Mn in the pig iron was 0.97%;

[0046] 2) 7 hours before the wind break, charge according to the requirements of the following levels, and make the loaded amount fill up the furnace hearth, bosh and all parts above the furnace body respectively during the wind break:

[0047] (1) Load coke in such an amount that the furnace hearth is filled before the wind is shut off;

[0048] (2) Load coke and manganese ore mixture, of which manganese ore is calculated according to the effective volume of blast furnace every 300m 3 Load 1.1 ton, and the rest is coke; the amount of mixture is to fill the bosh in principle;

[0049] (3) Load the empty material, the composition of the empt...

Embodiment 3

[0057] Embodiment 3 The effective volume of the blast furnace in this embodiment is 3200m 3 :

[0058] Its blast furnace batching and furnace sealing steps:

[0059] 1) Manganese ore was added 73 hours before the blast furnace was shut down to seal the furnace, in such an amount that the weight percentage of Mn in the pig iron was 0.80%;

[0060] 2) 7 hours before the wind break, charge according to the requirements of the following levels, and make the loaded amount fill up the furnace hearth, bosh and all parts above the furnace body respectively during the wind break:

[0061] (1) Load coke in such an amount that the furnace hearth is filled before the wind is shut off;

[0062] (2) Load coke and manganese ore mixture, of which manganese ore is calculated according to the effective volume of blast furnace every 300m 3 Load 0.81 tons, and the rest is coke; the principle is to fill the bosh with the amount of mixture;

[0063] (3) Load the empty material, the composition ...

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Abstract

A batching method for banking up a large-scale blast furnace comprises the following steps: adding manganese ore within 72 hours before damping-down and banking-up of the blast furnace; charging materials layer by layer within 6-8 hours before damping-down, wherein a hearth, a bosh and all parts above a furnace stack are full of the materials respectively at the time of damping-down; opening a tap hole 65-70 minutes before all the damping-down and banking-up materials are charged, discharging all iron slag so that the whole furnace is filled with the banking-up materials, and performing damping-down and banking-up. According to the method, under the premise of guaranteeing the total coke ratio, the slag-coke ratio, the furnace slag alkalinity, the furnace slag Al2O3 and MgO content and the like of blow-in burden, the Al2O3 weight concentration in furnace slag is controlled below 14.5, the reducibility is good, powder in materials entering the furnace is reduced, the air permeability is improved, and the furnace condition is stable, so that blowing-in after damping-down is facilitated.

Description

technical field [0001] The invention relates to a blast furnace sealing method, in particular to a large-scale blast furnace sealing batching method. Background technique [0002] In recent years, with the rapid increase of steel production capacity, the steel market has been volatile. In order to control the production capacity, the blast furnace has to be shut down for a long time. There are methods of empty material line and charging and sealing furnace for long-term wind break. Stopping the furnace with an empty material line needs to waste a lot of fuel, and a large amount of gas is discharged into the air to cause environmental pollution. For this reason, the blast furnace also has a method of sealing the furnace by changing the ingredients. [0003] Blast furnace smelting needs to carry out batching according to certain requirements. The raw material of the blast furnace is iron ore, the fuel is coke and coal powder, and auxiliary fuel and flux are also required. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/02
Inventor 尹腾董汉东陆隆文李向伟王齐武张庆喜陈进军张建鹏
Owner 武汉钢铁有限公司
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