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Slag conglomeration agent for hot metal pretreatment of magnesium injection and deep desulphurization and use method thereof

The technology of molten iron pretreatment and slag accumulation agent is applied in the field of process optimization of molten iron pretreatment and magnesium spraying for deep desulfurization, especially in the field of process optimization of deep desulfurization. Difficulty cleaning and other problems, to reduce the difficulty of slag removal, improve efficiency, and prevent sulfur return

Active Publication Date: 2010-09-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the use of passivated metal magnesium particles is the trend of desulfurization agent. It has the advantages of small dosage, small amount of slag, high desulfurization efficiency, and lower temperature. At present, it is widely used to increase the viscosity of slag by adding an acidic slag accumulator after the injection, but this will change the composition of the slag system, easily cause sulfur reversion and deteriorate the desulfurization effect, so it is necessary to improve the existing slag accumulator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] After the molten iron is sprayed with magnesium, add a slag gathering agent (the addition amount is 0.6kg / t iron). The main chemical components (weight percentage) of the slag gathering agent are: CaO: 56.67%, MgO: 38.80%, SiO 2 : 1.0%. After adding, stir with a slag removal machine and then remove the slag. Most of the slag is lumped and it is very easy to remove. After the slag removal, the sulfur content of the molten iron sample is 0.0035%;

[0011] The molten iron is loaded into the converter, and the sulfur content of the molten iron sample is 0.004%;

[0012] The amount of sulfur back is 0.0005%.

Embodiment 2

[0014] After magnesium spraying and desulfurization, add slagging agent (addition amount: 0.5kg / t iron), the main chemical composition (weight percentage) of slagging agent is; CaO: 52.25%, MgO: 36.77%, SiO 2 : 0.98%, stirring after adding, most of the slag agglomerates, but the amount of slag brought into the molten iron in this furnace is large (about 0.5kg / t iron), and there is thin slag after removing 60%, add the same slag accumulator again ( The amount of addition is 0.3kg / t iron) and stirring, the thin slag is also agglomerated, and it should be removed.

[0015] Slagging off after spraying, molten iron sampling sulfur content is 0.003%;

[0016] The molten iron is loaded into the converter, and the sulfur content of the molten iron sample is 0.003%;

[0017] Return sulfur to zero.

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PUM

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Abstract

The invention relates to a slag conglomeration agent applied to hot metal pretreatment magnesium injection deep desulphurization and an application method thereof, which pertain to the technical field of hot metal pretreatment in the steelmaking process. The slag conglomeration agent is sealed and packaged at 3kg to 7kg after magnesium injection or scattered on the slag surface evenly in the formof particulate. The addition amount is 0.5 kg / t to 1.0kg / t iron which contains the following components by the weight percentages: MgO: 32 percent to 40 percent, SiO2: 0.4 percent to 1.1 percent, S: 0.010 percent to 0.025 percent, water: 0 percent to 0.5 percent, and the rest is CaO and inevitable impurities. The weight percentages of various slagging constituents in the slag conglomeration agentare as follows: light-burned dolomite: 85 percent to 100 percent, and quick lime: 0 percent to 15 percent. The slag conglomeration agent has the advantages that: the slag conglomeration agent can be added immediately after magnesium injection to cause slag to form into blocks which are easy to remove, and resulfurization is prevented by adding acid slag conglomeration agent that is generally adopted.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment in steelmaking processes, and in particular provides a slagging agent for molten iron pretreatment for deep desulfurization by spraying magnesium and a method for using the same, which is suitable for process optimization of molten iron spraying magnesium desulfurization, especially deep desulfurization. Background technique [0002] At present, the pretreatment desulfurization of molten iron mainly includes the input method, the method of rotating and stirring the molten iron container, the method of mechanical stirring with a stirrer, and the injection method. Especially in recent years, injection has been widely used. It is a desulfurization method that sprays into the deep part of molten iron to stir the molten iron and desulfurizer fully. Commonly used desulfurizers include lime powder, calcium carbide powder, soda powder, metal magnesium, and lime-based composite desulfurize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 刘金刚朱志远郝宁石磊王彦锋王文军姜中行许晓东麻庆申杨建平沈峰彭松有李战军刘成王永岗吕延春
Owner SHOUGANG CORPORATION
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