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Slagging method of fluoride-free CaO-SiO2 refining slag in steelmaking process

A technology for refining slag and slag making, which is applied in the field of slag making of fluorine-free CaO-SiO2 series refining slag in the steelmaking process, can solve the problems of polluting the environment, endangering human health, unstable ore resources, etc., and achieves a stable price. Effect

Active Publication Date: 2022-02-22
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a fluorine-free CaO-SiO that can realize fast slagging and efficient desulfurization 2 It is a slagging method of refining slag in the steelmaking process to replace the conventional fluoride-containing CaO-SiO 2 Slag system, effectively solve the problems of fluoride-containing slag system polluting the environment, endangering human health, and unstable ore resources

Method used

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  • Slagging method of fluoride-free CaO-SiO2 refining slag in steelmaking process
  • Slagging method of fluoride-free CaO-SiO2 refining slag in steelmaking process
  • Slagging method of fluoride-free CaO-SiO2 refining slag in steelmaking process

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Experimental program
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Effect test

Embodiment 1

[0017] (1) Alloy, deoxidizer, carburizer and lime are added during the tapping process of the converter, and the amount of lime added is 200kg.

[0018] (2), add 250kg industrial sodium carbonate after converter tapping finishes, and every bag of sodium carbonate weighs 10kg, adds 200kg lime simultaneously.

[0019] According to the above-mentioned slag-making process, after the converter is tapped and before sodium carbonate is added, a slag sample is taken, and the composition of the slag is detected to be: CaO: 39.75%, SiO 2 : 45.16%, MgO: 4.59%, Al 2 o 3 : 5.02%, FeO: 2.19%, MnO: 2.40%, TiO 2 : 0.85%, P 2 o 5 : 0.02%, S: 0.02%, slag basicity is 0.88.

[0020] No slag is added to the refining station, and the slag sample is taken after the slag is energized, and the slag composition is detected to be CaO: 44.96%, SiO 2 : 29.38%, Na 2 O: 9.83%, MgO: 7.55%, Al 2 o 3 : 4.27%, FeO: 1.59%, MnO: 1.20%, TiO 2 : 0.56%, P 2 o 5 : 0.02%, S: 0.64%, slag basicity is 1.53. ...

Embodiment 2

[0023] (1) Alloy, deoxidizer, carburizer and lime are added during the tapping process of the converter, and the amount of lime added is 250kg.

[0024] (2), add 250kg industrial sodium carbonate after converter tapping finishes, and every bag of sodium carbonate weighs 10kg, adds 100kg lime simultaneously.

[0025] According to the above slag-making process, after the converter is tapped and before sodium carbonate is added, a slag sample is taken, and the slag composition is detected to be: CaO: 46.48%, SiO 2 : 39.38%, MgO: 3.42%, Al 2 o 3 : 3.95%, FeO: 3.02%, MnO: 2.73%, TiO 2 : 0.96%, P 2 o 5 : 0.03%, S: 0.02%, the slag basicity is 1.18.

[0026] No slag material is added to the refining station, and the slag sample is taken after the slag is energized, and the slag composition is detected to be CaO: 43.47%, SiO 2 : 30.18%, Na 2 O: 11.03%, MgO: 7.24%, Al 2 o 3 : 4.12%, FeO: 1.75%, MnO: 1.28%, TiO 2 : 0.51%, P 2 o 5 : 0.02%, S: 0.40%, the slag basicity is 1.44. ...

Embodiment 3

[0029] (1) Alloy, deoxidizer, carburizer and lime are added during the tapping process of the converter, and the amount of lime added is 150kg.

[0030] (2), add 500kg industrial sodium carbonate with pouch after converter tapping finishes, and every bag of sodium carbonate weighs 10kg, adds 100kg lime simultaneously.

[0031] According to the above-mentioned slagging process, after the converter is tapped, the slag sample is taken before the sodium carbonate is added, and the slag composition is detected as follows: CaO: 38.38%, SiO 2 : 46.80%, MgO: 4.81%, Al 2 o 3 : 4.45%, FeO: 2.16%, MnO: 2.47%, TiO 2 : 0.89%, P 2 o 5 : 0.02%, S: 0.02%, slag basicity is 0.82.

[0032] No slag is added to the refining station, and the slag sample is taken after the slag is energized, and the slag composition is detected to be CaO: 38.19%, SiO 2 : 28.94%, Na 2 O: 17.17%, MgO: 7.91%, Al 2 o 3 : 3.33%, FeO: 1.59%, MnO: 1.19%, TiO 2 : 0.80%, P 2 o 5 : 0.02%, S: 0.86%, slag basicity i...

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Abstract

The invention relates to a slagging method of fluoride-free CaO-SiO2 series refining slag in a steelmaking process. The slagging method comprises the following steps that: (1) lime and industrial sodium carbonate are taken as slagging raw materials; (2) alloy, a deoxidizing agent, a carburant and lime are added in a converter tapping process, the adding amount of the lime is 100-250 kg, components of slag are controlled, specifically, CaO is controlled to be 36%-44%, and SiO2 is controlled to be 37%-44%, and the alkalinity of the slag is controlled to be 0.8-1.2; and (3) 200-700 kg of industrial sodium carbonate is added after converter tapping is finished, 0-400 kg of lime is supplemented in a sodium carbonate adding process, the components of the slag are controlled, specifically, CaO is controlled to be 27%-51%, SiO2 is controlled to be 25%-32%, and Na2O is controlled to be 8%-31%, and the alkalinity of the slag is controlled to be 1.1-1.6. According to the slagging method of the invention, the industrial alkali is used as the slagging raw material, is relatively stable in components and price, does not pollute the environment in the use process, is harmless to human health, can replace a conventional fluoride-containing CaO-SiO2 slag system, and thus, the problems that the fluoride-containing slag system pollutes the environment, harms the human health and is unstable in ore resources are effectively solved.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a fluorine-free CaO-SiO used in the production of silicon-deoxidized steel 2 It is a slag-making method of refining slag in the steelmaking process. Background technique [0002] In the production process of silicon deoxidized steel, the refining slag is usually made of CaO-SiO 2 For slag system, in order to obtain high-basicity slag with good fluidity and improve the desulfurization ability of slag, it is usually necessary to add a certain amount of flux. [0003] At present, most steel mills at home and abroad use fluorine-containing substances such as fluorite as fluxes. Calcium fluoride in fluorite will decompose at the temperature of steelmaking, causing environmental pollution and endangering human health. At the same time, with the depletion of fluorite resources, it is difficult to guarantee the grade of fluorite, which makes it difficult to guarantee the...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/076
CPCC21C7/064C21C7/076Y02P10/20
Inventor 孟晓玲管挺屈志东谢有
Owner ZENITH STEEL GROUP CORP
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