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Semi-steel making slagging agent and slagging method

A steelmaking slagging agent and slagging technology, applied in the field of metallurgy, can solve the problems of shortening the formation time, achieve the effects of lowering the melting point of slag, promoting rapid slagging, and low cost

Active Publication Date: 2017-12-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slag formation time in the initial stage of steelmaking needs to be further shortened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The 120t converter of a certain factory uses semi-steel for steelmaking, and the phosphorus content of the semi-steel is 0.075%. Add active lime, high magnesium lime, slagging agent and other slagging materials in batches, the total amount of active lime and high magnesium lime added is 30kg / steel, and each batch of materials is added with active lime and high magnesium lime at the same time according to (active lime and The total amount of high magnesium lime added: slag forming agent = 1:0.8) ratio of slagging agent is added, the total amount of slagging agent is 24kg / steel, and the smelting process is returned to dryness, and 1kg / t steel of slagging agent is quantitatively added to the furnace. The composition of the slagging agent is: Al 2 o 3 : 20%, SiO 2 : 30%, iron oxide (Fe 2 o 3 and FeO): 20%, CaO: 15%, MgO: 9%, and the rest are impurities with a particle size of 10-50mm. When the slagging agent is used for slagging, the initial slag formation time is only...

Embodiment 2

[0031] The 120t converter of a certain factory uses semi-steel for steelmaking, and the phosphorus content of the semi-steel is 0.065%. Add active lime, high magnesium lime, slagging agent and other slagging materials in batches. The total amount of active lime and high-magnesium lime added is 28kg / steel. Add active lime and high-magnesium lime to each batch of materials and add slagging at the same time according to the ratio (total amount of active lime and high-magnesium lime: slagging dosage = 1:1) The total dosage of slagging agent is 28kg / steel, and the composition of slagging agent is: Al 2 o 3 : 30%, SiO 2 : 25%, iron oxide (Fe 2 o3 and FeO): 18%, CaO: 13%, MgO: 6%, and the rest are impurities with a particle size of 10-50mm. When the slagging agent is used for slagging, the initial slag formation time is only 1.8 minutes, and the phosphorus content of the final molten steel is 0.008%.

Embodiment 3

[0033] A 120t converter in a factory uses semi-steel for steelmaking. The phosphorus content of the semi-steel is 0.080%. Add active lime, high magnesium lime, slagging agent and other slagging materials in batches. The total amount of active lime and high-magnesium lime added is 25kg / steel. Add active lime and high-magnesium lime to each batch of materials and add slagging at the same time according to the ratio (total amount of active lime and high-magnesium lime: slagging dosage = 1:1.5) agent, the total amount of slagging agent is 37.5kg / steel, and the composition of slagging agent is: Al 2 o 3 : 38%, SiO 2 : 20%, iron oxide (Fe 2 o 3 and FeO): 20%, CaO: 10%, MgO: 3%, and the rest are impurities with a particle size of 10-50mm. When the slagging agent is used for slagging, the initial slag formation time is only 1.6 minutes, and the phosphorus content of the final molten steel is 0.006%.

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Abstract

The invention relates to a semi-steel making slagging agent and a slagging method thereof, belonging to the technical field of metallurgy. The technical problem solved by the invention is to provide a semi-steel making slagging agent. The semi-steel making slagging agent of the present invention is composed of the following components in weight percentage: Al2O3: 20-38%, SiO2: 20-30%, iron oxide: 15-20%, CaO: 10-15%, MgO: 3-9%, and the rest are impurities. Compared with the prior art, the semi-steelmaking slagging agent of the invention has the characteristics of low cost and lower melting point of slag, can promote rapid slag formation, and improve converter dephosphorization effect. By adopting the semi-steel making slagging agent and the slagging method of the present invention, the initial slag formation time during semi-steel smelting can be controlled within 2 minutes, and the phosphorus content of the final molten steel can be controlled within 0.008%.

Description

technical field [0001] The invention relates to a semi-steel making slagging agent and a slagging method thereof, belonging to the technical field of metallurgy. Background technique [0002] my country is a big country of vanadium-titanium magnetite, with rich resources of vanadium-titanium magnetite. Domestic iron and steel enterprises such as Panzhihua Iron and Steel, Chenggang, Kunming Iron and Steel, and Weiyang Iron and Steel all use vanadium-titanium magnetite for smelting, and the main raw material for converter steelmaking It adopts semi-steel after vanadium extraction by special converter. The carbon mass percentage in the semi-steel obtained after vanadium-containing molten iron is desulfurized and vanadium is 3.4% to 4.0%. traces, the mass percentage of sulfur in semi-steel is controlled within 0.015%, and the mass percentage of phosphorus in semi-steel is 0.060% to 0.080%. , And insufficient heat and other characteristics, resulting in the long time required to fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 陈均曾建华梁新腾王二军张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP