Converter slag forming process for rapid slagging

A converter and slagging technology, which is applied to the improvement of process efficiency, manufacturing converters, lime production, etc., can solve the problems of affecting the dust removal effect of fans, waste of lime, affecting the speed of slag making, etc., so as to reduce lime consumption and production. cost, the effect of improving the speed of slag formation

Inactive Publication Date: 2016-05-25
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lime is broken due to collision during transportation, feeding, and feeding, which makes part of the lime particle size smaller. During the converter feeding process, this part of the lime is sucked away by the dust removal fan due to its small particle size, resulting in waste of lime. At the same time, the dust removal pipeline Therefore, a large amount of lime dust is deposited, which seriously affects the dust removal effect of the fan.
To sum up, there is a seemingly contradictory situation in the process of converter slagging at present. On the one hand, the particle size of slag-forming lime should not be too large, so as not to affect the slagging speed, and lime with a smaller particle size must be selected; On the one hand, if the particle size of slag-forming lime is too small, it will be sucked away by the dust collector, causing waste, and at the same time seriously affecting the dust removal effect of the fan
So far, this kind of situation has not been effectively solved, which has seriously affected the slagging speed and production cost of the converter. Therefore, it is very necessary to improve the existing slagging process of the converter to achieve full Good for small particle size lime, reduce production cost and improve dust removal effect

Method used

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  • Converter slag forming process for rapid slagging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] When the molten iron silicon is 0.41%, the primary fan speed changes:

[0041] When the converter is slag splashing, keep the primary fan speed at 1000r / min. After the slag splashing is over, the fan speed will drop to 300r / min. After watering, increase the fan speed to 1300r / min until the end of blowing.

[0042] Lime material addition amount:

[0043] The amount of lime surface added is 1500kg. When loading molten iron, the impact of molten iron is used to make slag initially, so that the lime is distributed in a dispersed manner. The first batch of lime blocks of 1500kg can be added in the early stage of blowing for 1 minute to form a smelting stage with the ash surface before iron loading. converter slag.

Embodiment 2

[0045] When the molten iron silicon is 0.45%, the primary fan speed changes:

[0046] When the converter is slag splashing, keep the primary fan speed at 1000r / min. After the slag splashing is over, the fan speed will drop to 300r / min. After watering, increase the fan speed to 1300r / min until the end of blowing.

[0047] Lime material addition amount:

[0048] The amount of lime surface added is 1700kg. When the molten iron is loaded, the impact of the molten iron is used to make slag initially, so that the lime is distributed in a dispersed manner. The first batch of lime blocks of about 1700kg can be added in the first 75 seconds of blowing to form a smelting process with the ash surface before iron loading. Early converter slag.

Embodiment 3

[0050] When the molten iron silicon is 0.50%, the primary fan speed changes:

[0051] When the converter is slag splashing, keep the primary fan speed at 1000r / min. After the slag splashing is over, the fan speed will drop to 300r / min. After watering, increase the fan speed to 1300r / min until the end of blowing.

[0052] Lime material addition amount:

[0053] The amount of lime surface added is 2000kg. When the molten iron is loaded, the impact of the molten iron is used to make slag initially, so that the lime is distributed in a dispersed manner. The first batch of lime blocks of about 2000kg can be added in the first 90 seconds of blowing to form a smelting process with the ash surface before loading the iron. Early converter slag.

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Abstract

The invention discloses a converter slag forming process for rapid slagging and belongs to the technical field of converter processes for steel production. The converter slag forming process is used for rapid slagging of a converter. According to the technical scheme, in the converter slag forming process, the rotating speed of a fan is reduced before waste molten iron is added into the converter, lime powder of a small particle size is added in advance, and waste caused when lime powder of an extremely small particle size is sucked away by the fan is avoided; in addition, an initial slagging reaction is completed under the impact of the molten iron in the molten iron charging process, the rotating speed of the fan is increased to a normal value after lime powder is added, and lime blocks are added in the converting process. By means of the converter slag forming process, the slagging speed at the earlier smelting stage of the converter is effectively increased, and meanwhile waste caused when lime of an extremely small particle size is sucked away by the fan in the smelting process of the converter is reduced. The converter slag forming process is an innovation, solves the problem that the particle size of lime can not meet both sides, which brings trouble to slagging of the converter for a long term, effectively increases the slag forming speed in slagging of the converter, reduces the lime consumption in the slagging process, lowers production cost and improves the dust removing effect.

Description

technical field [0001] The invention relates to a converter slagging process, which belongs to the technical field of converter processes for iron and steel production. Background technique [0002] Lime is the main slagging material used in steelmaking. It has the ability to dephosphorize and desulfurize, and it is also the most used slagging material. In the converter blowing process, the lime particle size has a great influence on the slagging time. If the lime particle size is too large, Ca with high melting point will be formed around the lime block during smelting. 2 SiO 4 A large amount of lime is wrapped in the material, which affects the melting of lime and greatly reduces the speed of slag formation; if the particle size of lime is too small, it is easy to fly away and be sucked away by the dust removal fan, resulting in waste. Therefore, the lime particle size is generally required to be 5-40mm during slagging. However, the lime is broken due to collision durin...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C5/30
CPCC21C5/30C21C5/36Y02P10/20Y02P40/40
Inventor 叶飞王峰张大勇胡庆利张军国张响吴飞鹏李艳龙马慧竹赵泽东迟洪亮田俊强李国辉刘士朝刘晓彬韩志颜蒋昭阳马坤霞卢彬崔家峰张贺君刘广涛
Owner TANGSHAN IRON & STEEL GROUP
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