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Method for melting converter bottom by remaining converter slags

A converter and furnace bottom technology, applied in the field of converter smelting technology, can solve the problems of increasing consumption of ferrosilicon alloy and increasing smelting cost, and achieve the effects of easy operation, lower production cost and shortened smelting time

Active Publication Date: 2012-10-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that due to the need to add ferrosilicon to the furnace, the consumption of ferrosilicon alloy is increased, and the cost of smelting is increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific operation steps are:

[0023] 1. Control of oxidative property of converter final slag

[0024] Before leaving the slag to melt the furnace bottom, control the carbon content at the end point of the converter at 0.028wt% to ensure that the mass percentage of the final slag FeO is controlled at 25%, and such slag is more conducive to melting the furnace bottom.

[0025] 2. Before leaving the slag at the bottom of the furnace, the oxygen lance residue and residual steel must be cleaned; and a spare empty slag tank should be prepared to prevent the excessive amount of slag after the bottom of the furnace from affecting the production of the next furnace.

[0026] 3. In order to ensure the stirring force and slag heating efficiency, no slag is splashed after tapping; after the converter taps, 2 / 3 of the slag is poured out and 1 / 3 of the slag is left.

[0027] 4. Oxygen blowing operation:

[0028] Manual oxygen drop gun, when the nozzle of the oxygen gun drops...

Embodiment 2

[0033] The specific operation steps are:

[0034] 1. Control of oxidative property of converter final slag

[0035] Before leaving the slag to melt the bottom of the furnace, control the carbon content at the end of the converter to 0.025wt% to ensure that the mass percentage of FeO in the final slag is controlled at 22%. Such slag is more conducive to melting the bottom of the furnace.

[0036] 2. Before leaving the slag at the bottom of the furnace, the oxygen lance residue and residual steel must be cleaned; and a spare empty slag tank should be prepared to prevent the excessive amount of slag after the bottom of the furnace from affecting the production of the next furnace.

[0037] 3. In order to ensure the stirring force and the heating efficiency of the slag, no slag is splashed after tapping; after the converter taps, 3 / 5 of the slag is poured out and 2 / 5 of the slag is left.

[0038] 4. Oxygen blowing operation:

[0039] Manual oxygen drop gun, when the nozzle o...

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Abstract

The invention provides a method for melting a converter bottom by remaining converter slags. The method comprises the steps that: a small amount of slags are left when the converter tapping is finished, high-pressure oxygen is blowed into the converter by an oxygen lance, oxygen blowing time is controlled according to the distance between a oxygen lance nozzle and the converter bottom, temperature of the slags in the converter is heated, weak stirring of the high temperature slags is carried out, and the converter bottom is flushed by by an oxygen stream to achieve a purpose of reducing the height of the converter bottom. According to the invention, the height of a converter bottom of a top-bottom combined blowing converter can be controlled within a preset ideal range, the dynamic balance of the converter bottom can be realized, the top-bottom combined blowing smelting effect is ensured, and the smelting operation and maintenance of the converter body are facilitated; in addition, the smelting time can be shortened, the production cost can be reduced by shortening the converter smelting time by 1-2 min. The method of the invention has simple process and convenient operation, is safe and reliable, and has almost no corrosion to end-point parts of a converter liner such as a ball segment, a trunnion, a slag line, and the like.

Description

technical field [0001] The invention belongs to the technical field of converter smelting technology, and in particular relates to a method for melting the bottom of a furnace by utilizing part of the slag (ie, remaining slag) reserved after tapping the converter. Background technique [0002] With the development of steelmaking technology, the top-bottom combined blowing converter has been paid more and more attention by manufacturers. The rising of the bottom of the converter not only directly affects the bottom blowing effect, but also has a negative impact on the smelting operation. However, for the converter, due to the impact of slag splashing to protect the furnace, it is inevitable that the bottom of the furnace will rise at a certain stage. Therefore, it is necessary to measure the height of the furnace bottom frequently, and take timely measures to control it. The furnace bottom process is an effective method to control the rise of the furnace bottom. [0003] C...

Claims

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Application Information

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IPC IPC(8): C21C5/30
CPCY02P10/20
Inventor 郭猛毛志勇安连旗简龙孙艳霞赵志刚宋广刚
Owner ANGANG STEEL CO LTD
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