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Method for treating desulfurized slag iron

A technology for desulfurization slag and desulfurizer, applied in the direction of manufacturing converters, etc., can solve problems such as large limitations, and achieve the effects of wide application, simple and practical process, and stable consumption.

Active Publication Date: 2018-05-15
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Some enterprises have adopted the method of finely crushing desulfurized slag and iron, that is, adding small-sized desulfurized slag and iron into the iron ladle, and using the stirring power of the blast furnace tapping process to melt the desulfurized slag and iron, but this method consumes the amount of desulfurized slag and iron Only about 1 ton of molten iron can be added to each bag, and it is mainly used in enterprises that implement the "one pot to the bottom" process, which has great limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 of the present invention is a method for processing desulfurized iron slag. The method includes: adding desulfurized iron slag into molten iron in a converter for blowing to melt it, and performing semi-steel tapping after the melting of desulfurized iron slag is completed.

[0029] In order to ensure that the desulfurized iron slag melts within a limited time, the weight of the desulfurized iron slag is controlled so that the unit weight of the desulfurized iron slag described in the embodiments of the present invention is 1000-1500Kg;

[0030] In order to ensure that the desulfurized iron slag melts within a limited time, the size of the desulfurized iron slag is required, so that the specifications and sizes of the desulfurized iron slag in the embodiment of the present invention meet: the thickness is 100-300mm, and the length is 500-1000mm;

[0031] In Example 1, the blowing and oxygen supply intensity of the converter is 3.41Nm 3 / min / t, after confirm...

Embodiment 2

[0035] Embodiment 2 of the present invention is a method for processing desulfurized iron slag. The method includes: adding desulfurized iron slag to molten iron in a converter for blowing to melt it, and performing semi-steel tapping after melting the desulfurized iron slag. Add slag during the tapping process, carry out pre-desulfurization and compound desulfurization slagging, and carry out semi-steel silicon compounding operation, then semi-steel molten steel is sent to the desulfurization station for treatment, and reloaded into converter smelting + scrap steel after desulfurization treatment.

[0036] The unit weight of the desulfurization iron slag described in the embodiment of the present invention is 100-500Kg; the thickness is 50-100mm, and the length is 100-500mm;

[0037] In Example 2, the blowing and oxygen supply intensity of the converter is 3.0Nm 3 / min / t, after confirming the ignition, the oxygen supply intensity is 1.9Nm 3 / min / t control, total oxygen suppl...

Embodiment 3

[0046] The method for treating desulfurized iron slag in Example 3 of the present invention is similar to that in Example 2.

[0047] The unit weight of the desulfurized iron slag described in Example 3 of the present invention is 500-1000Kg; the thickness is 100-200mm, and the length is 500-800mm;

[0048] In Example 3, the blowing and oxygen supply intensity of the converter is 3.5Nm 3 / min / t, after confirming the ignition, the oxygen supply intensity is 2.0Nm 3 / min / t control, total oxygen supply 3200Nm 3 ;Bottom blow strength 0.102Nm 3 / min / t.

[0049] Example 3 When the weight of desulfurized slag and iron added to the converter is 35t and the molten iron is 185t, the loading amount of the converter is controlled at 225t.

[0050] It has been verified by practical application that 35t of desulfurized iron slag in the converter is completely melted within 9 minutes.

[0051] In order to ensure the follow-up compound desulfurization effect, when the desulfurization sla...

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Abstract

The invention provides a method for treating desulfurized slag iron. The method comprises the steps that the desulfurized slag iron is added into molten iron of a convertor to be blew, thus the desulfurized slag iron is melted, wherein as for each single block of the desulfurized slag iron, the weight is smaller than or equal to 1500 Kg, the thickness is smaller than or equal to 300 mm, and the length is smaller than or equal to 1000 mm; the oxygen supply strength of the convertor is 1.9-3.5 Nm<3> / min / t, and the total oxygen supply amount of the convertor is 3000-3500 Nm<3>; the bottom blowingstrength is 0.077-0.124 Nm<3> / min / t; and after melting of the desulfurized slag iron is finished, semi-steel tapping is conducted. The desulfurized slag iron can be consumed stably, the treatment amount is large, normal desulfurization can be conducted under the situation of the high content of semi-steel sulfur, meanwhile, the desulfurized semi-steel molten iron can be normally smelted into branded steel, and the process is simple and practical.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for processing desulfurized iron slag. Background technique [0002] my country is a big country in steel production, with an annual steel output of 700 million tons, accounting for more than 50% of the world's steel mills. As we all know, the iron and steel industry is a large energy consumer, so how to save energy and reduce emissions has always been one of the important tasks of iron and steel enterprises. As the world's requirements for steel quality are getting higher and higher, hot metal desulfurization projects have blossomed in various steel mills, so more and more desulfurized iron slag is produced. This part of iron slag has a high iron content, but at the same time The S content in the slag is very high, usually reaching more than 2%, and the molten steel is slightly mixed with a part of the iron slag, which seriously pollutes the molten stee...

Claims

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Application Information

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IPC IPC(8): C21C5/34C21C7/064
CPCC21C5/34C21C7/064
Inventor 孙亮彭文涛陆庆彭开玉张立国却汉玉郑全冀建立
Owner BEIJING SHOUGANG CO LTD
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