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Method for improving desulfurization effect of single-blown granular magnesium

A granular magnesium and high-level technology, applied in the field of iron and steel metallurgy, can solve the problems of difficult to remove clean, can not meet the development requirements of special varieties, etc., to improve the desulfurization effect, improve the slag removal effect, and avoid the effect of returning sulfur.

Inactive Publication Date: 2021-01-05
QINGDAO SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the amount of slag from single-blowing granular magnesium desulfurization is small and thin, and it is difficult to remove it. The small amount of slag remaining in the molten iron contains a high concentration of MgS. After being mixed into the converter, sulfur reversion occurs, and S returns to the steel.
The molten iron is tumbling during the desulfurization and desulfurization process of single-blown granular magnesium. After the desulfurization, the S content of the molten iron is basically greater than 0.002%, which cannot meet the requirements for the development of special varieties.

Method used

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  • Method for improving desulfurization effect of single-blown granular magnesium
  • Method for improving desulfurization effect of single-blown granular magnesium
  • Method for improving desulfurization effect of single-blown granular magnesium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Before the pretreatment of molten iron, the condition of molten iron is shown in Table 1.

[0019] Table 1 Example 1 Table of molten iron components before desulfurization

[0020] chemical composition C,％ Si,% Mn,% P,％ S,％ Ti,% T,℃ weight, t Before desulfurization 4.07 0.59 0.29 0.119 0.039 0.060 1326 105 Desulfurization target - - - - 0.005 - 1250 -

[0021] A method for improving the desulfurization effect of single-blown granular magnesium, comprising the steps of:

[0022] (1) Slagging before desulfurization:

[0023] Start the tipping vehicle to tilt the molten iron ladle to a suitable position (thin slag molten iron is about 8m away from the ladle edge, and slag lump molten iron is about 15cm away from the ladle edge), and use a pneumatic slag removal gun to cooperate with slag removal. Control the scraper of the slag scraper, and carry out the slag removal operation in the slag tank placed on the slag tank tru...

Embodiment 2

[0032] Before the pretreatment of molten iron, the condition of molten iron is shown in Table 3.

[0033] Table 3 Example 2 Desulfurization before molten iron composition table

[0034]

[0035] (1) Slagging before desulfurization:

[0036] Start the tipping vehicle to tilt the molten iron ladle to a suitable position (thin slag molten iron is about 8m away from the ladle edge, and slag lump molten iron is about 15cm away from the ladle edge), and use a pneumatic slag removal gun to cooperate with slag removal. Control the scraper of the slag scraper, and carry out the slag removal operation in the slag tank placed on the slag tank truck. The slag removal time after desulfurization is required to be 6 minutes. The amount of slag on the molten iron surface is ≤0.05%, to ensure that the slag is cleaned.

[0037] (2) Lime addition: After removing slag in the early stage of molten iron, use a thickening slag agent device, first lower the feeding chute to the lower position, ...

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Abstract

The invention provides a method for improving the desulfurization effect of single-blown granular magnesium. The method includes the specific process that molten iron is fed into a station, slagging off is performed before desulfurization, lime is added to the surface of the molten iron, granular magnesium is blown, and slagging off is performed after desulfurization. According to the method, thelime is added to an iron ladle before granular magnesium is blown, CaO in the lime is promoted to be subjected to molten iron desulfurization under the stirring effect generated by granular magnesiumgasification pressure which is not balanced under the static pressure of the molten iron in the single-blown granular magnesium desulfurization process, the S content in the desulfurized molten iron is higher than 0.002%, and the desulfurization effect is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for improving the desulfurization effect of single blowing granular magnesium. Background technique [0002] S element is a harmful element for most steel grades, and many steel grades need deep desulfurization. The single-blowing granular magnesium desulfurization process is a single injection of passivated granular magnesium for desulfurization. The feeding of granular magnesium is achieved through the rotor feeding meter to achieve accurate feeding, and the feeding intensity ranges from 6 to 15kg / min. There is a gasification chamber at the end of the spray gun, which creates good conditions for magnesium gasification and dissolution in molten iron. The core of the single-blowing granular magnesium process is to realize the accurate calculation and accurate feeding of the granular dosage according to the molten iron conditions, so as to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02C21C7/00C22C38/02C22C38/04C22C38/14
CPCC21C1/02C21C7/00C21C7/064C22C38/002C22C38/02C22C38/04C22C38/14
Inventor 张智涛郭发军肖超王玉峰崔建海时向涛赵换霞于文浩
Owner QINGDAO SPECIAL STEEL CO LTD
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