High-basicity refining slag for slag washing of revolving furnace steel-making

A converter steelmaking and refining slag technology, applied in the field of iron and steel metallurgy, can solve the problems of low desulfurization rate, unfavorable aluminum deoxidation, steel refining desulfurization, deoxidation and removal of non-metallic inclusions, adverse effects on production rhythm, etc.

Inactive Publication Date: 2008-03-12
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

[0005] 1. The low alkalinity is not conducive to the subsequent refining desulfurization, deoxidation and removal of non-metallic inclusions of aluminum deoxidized steel
If only active lime is used as refining slag, although the alkalinity of the ladle slag formed in the tapping process can be significantly increased, the melting point of active lime is high, and the heating and melt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh the required raw materials according to the ratio shown in Table 1, and mix them with a disc mixer to make high-alkalinity refining slag. The obtained high alkalinity refining slag composition (percentage by weight) is: CaO: 72.2%, SiO 2 : 2.7%, Al 2 o 3 : 3.2%, Na 2 O: 2.8%, CaF 2 : 11.6%, MgO: 3.5%, and the rest are ignition components and trace impurities such as P and S, among which CaO / SiO 2 = 26.7.

[0033] When the high-basicity refining slag is used to smelt 20CrMoH steel in a converter, the sulfur content of molten steel at the end of smelting is 0.010%, the total iron (TFe) content of the slag at the end of smelting is 30.5%, and CaO / SiO 2 = 6.0. The amount of slag in the tapping process is 10kg / t 钢 Under the condition of 7kg / t at the beginning of tapping 钢 The amount of the high alkalinity refining slag is added for slag washing, the desulfurization rate of the tapping process is 50%, the nitrogen addition amount of molten steel is 0.00050%, and...

Embodiment 2

[0035] Weigh the required raw materials according to the ratio shown in Table 1, and mix them with a disc mixer to make high-alkalinity refining slag. The obtained high alkalinity refining slag composition (percentage by weight) is: CaO: 74.6%, SiO 2 : 1.8%, Al2 o 3 : 2.6%, Na 2 O: 2.7%, CaF 2 : 9.4%, MgO: 4.4%, and the rest are ignition components and trace impurities such as P and S, among which CaO / SiO 2 = 41.4.

[0036] When the high-basicity refining slag is used for smelting 20CrMoH steel in a converter, the sulfur content of molten steel at the end of smelting is 0.008%, the total iron (TFe) content of the slag at the end of smelting is 25.6%, and CaO / SiO 2 = 6.1. The amount of slag in the converter tapping process is 10kg / t 钢 Under the condition of 7.8kg / t at the beginning of tapping 钢 Add the high alkalinity refining slag to carry out slag washing, the desulfurization rate in the tapping process is 75%, the amount of nitrogen increase in molten steel is 0.00040...

Embodiment 3

[0038] Weigh the required raw materials according to the ratio shown in Table 1, and mix them with a disc mixer to make high-alkalinity refining slag. The obtained high alkalinity refining slag composition (percentage by weight) is: CaO: 73.3%, SiO 2 : 2.4%, Al 2 o 3 : 2.7%, Na 2 O: 2.8%, CaF 2 : 10.5%, MgO: 4.0%, and the rest are ignition components and trace impurities such as P and S, among which CaO / SiO 2 = 30.5.

[0039] When the high-basicity refining slag is used for P510L steel converter smelting, the sulfur content of molten steel at the end of smelting is 0.011%, the total iron (TFe) content of slag at the end of smelting is 30.6%, and CaO / SiO 2 = 4.8. The amount of slag in the converter tapping process is 9.5kg / t 钢 Under the condition of 5.3kg / t at the beginning of tapping 钢 Add the high alkalinity refining slag to carry out slag washing, the desulfurization rate in the tapping process is 45.5%, the amount of nitrogen increase in molten steel is 0.00030%, an...

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Abstract

The invention relates to a high-alkalinity refining slag and a preparing method for the slag for scrubbing slag of a converter, which comprises active lime, fluorspar and industrial pure alkaline that are mixed evenly in a disk mixer. The chemical components of the slag by weight are: 70.0%<=CaO<= 88%, 0<SiO2<=3.0%, 0<Al2O3<=4.5%, 2.0%<=Na2O<=4.1%, 8.0%<=CaF2<=13.3%, 0<MgO<= 5.2% and the remainder are igloss elements and trace foreign matters such as P and S, etc., the binary alkalinity CaO/SiO2>=23.3. When the high-alkalinity refining slag is used for scrubbing slag when tapping in the converter, the melting is fast, and no splashing will occur, the desulfurization efficiency is high and steady, and can meet the requirements for refining, deoxidizing and removing non-metallic foreign matters.

Description

technical field [0001] The invention relates to a high-alkalinity refining slag, in particular to a high-alkalinity refining slag for washing converter steelmaking slag and a preparation method thereof, belonging to the technical field of iron and steel metallurgy. Background technique [0002] With the development of society and economy, users have higher and higher requirements on the quality of steel. High-quality steel has strict requirements on the content of sulfur, oxygen and non-metallic inclusions. For example, high-grade pipeline steel requires S≤0.005% in steel, gears Steel requires total oxygen (T[O])≤0.0015% in steel, but the molten steel smelted by ordinary steelmaking furnace is difficult to meet such quality requirements. On the other hand, in order to improve production efficiency and shorten the smelting time, it is also hoped that some tasks of the steelmaking furnace can be transferred to the outside of the furnace. Therefore, people pay more and more at...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C5/28
CPCY02P10/20
Inventor 陈天明杨素波曾建华江南红
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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