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Ladle furnace refining agent and preparation thereof

A ladle furnace refining and ladle furnace technology, which is applied in the field of molten steel refining agents, to achieve the effects of reducing production costs, fast slag removal, and reduced consumption

Inactive Publication Date: 2009-01-14
武汉钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the existing molten steel refining agent contains magnesium chloride solution and the preparation method adopts high-temperature heating in a heating furnace, and provides a ladle furnace molten steel refining agent and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First put the X70 pipeline ladle furnace refining waste slag into the heating furnace and heat it with steam at 800°C for 1.5 hours. , 22wt% ~ 25wt% Al 2 o 3 Mix to form a solid material, then mix with waste paper slurry whose weight accounts for 5wt% to 8wt% of the solid material, then granulate, and dry at 100°C for 3 hours until the water content does not exceed 0.5wt%.

[0018] Among them, the main chemical composition of X70 pipeline steel ladle furnace refining waste slag is: CaO is 48wt% ~ 56wt%, Al 2 o 3 29wt% ~ 33wt%, SiO 2 14wt% ~ 19wt%, the rest is MgO, CaF 2 , MnO, FeO, P, S and unavoidable impurities. Ladle furnace refining waste slag, CaO, Al 2 o 3 The particle size of <1mm exceeds 98wt%; the weight percentage concentration of waste paper slurry is 2wt% ~ 3wt%; after mixing, the granulation is to make the mixed material into balls through a disc ball machine, and the effective particle size is 20mm ~ 25mm.

[0019] The refining agent prepared in th...

Embodiment 2

[0021] Put the cold pier steel ladle furnace refining waste slag into the heating furnace and heat it with water steam at 900°C for 1 hour. , 14wt% ~ 17wt% Al 2 o 3 Mix to form a solid material, then mix with calcium aluminate cement solution whose weight accounts for 8wt%-10wt% of the solid material, then granulate, and dry at 140°C for 2 hours.

[0022] Among them, the main chemical composition of the refining waste slag of cold pier steel ladle furnace is: CaO is 58wt% ~ 60wt%, Al 2 o 3 22wt% ~ 28wt%, SiO 2 10wt% ~ 14wt%, the rest is MgO, CaF 2 , MnO, FeO, P, S and unavoidable impurities. Ladle furnace refining waste slag, CaO, Al 2 o 3 The particle size is more than 98wt% of <1mm, and the weight percentage concentration of the calcium aluminate cement solution is 1wt%~2wt%. After mixing, the granulation is to shape the mixture through a press, and the effective particle size is 10mm~20mm.

[0023] The refining agent prepared in this example has a melting point of 1...

Embodiment 3

[0025] Put the X70 pipeline steel ladle furnace refining waste slag into the heating furnace and heat it with steam at 1000°C for 0.5 hours. , 6wt% ~ 9wt% Al 2 o 3 Mix to form a solid material, then mix with a polyvinyl alcohol solution whose weight accounts for 12wt% to 15wt% of the solid material weight, granulate, and dry at 200°C for 1 hour.

[0026] Among them, the main chemical composition of X70 pipeline steel ladle furnace refining waste slag is: CaO is 48wt% ~ 56wt%, Al 2 o 3 29wt% ~ 33wt%, SiO 2 14wt% ~ 19wt%, the rest is MgO, CaF 2 , MnO, FeO, P, S and unavoidable impurities. Ladle furnace refining waste slag, CaO, Al 2 o 3 The particle size is less than 1mm, more than 98%, and the weight percentage concentration of polyvinyl alcohol solution is 0.3wt% ~ 1wt%. After mixing, the granulation is to make the mixture into balls through a disc ball machine, and the effective particle size is 5mm ~ 25mm .

[0027] The melting point of the refining agent prepared i...

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Abstract

The invention relates to a ladle furnace molten steel refining agent and a preparation method thereof, belonging to the technical filed of the molten steel refining agent. The main components of the steel ladle furnace molten steel refining agent are 50 weight percent to 90 weight percent of ladle furnace refining waste slag, 4 weight percent to 20 weight percent of CaO, 6 weight percent to 30 weight percent of Al2O3 mixture and an adhesive solution with the weight concentration accounting for 0.3 weight percent to 3 weight percent. The preparation method adopts the steps: ladle furnace refining waste slag is positioned into a heating furnace to be heated for 0.5 hour to 1.5 hours through water vapor at a temperature of 800 DEG C to 1000 DEG C, the ladle furnace refining waste slag is evenly mixed with the adhesive solution with the weight percentage accounting for 5 percent to 15 percent of the Al2O3 mixture and with the weight percentage concentration accounting for 0.3 percent to 3 percent to manufacture particles after being taken out of the furnace and naturally cooled down and then dried for 1 to 3 hours at a temperature of 100 DEG C to 200 DEG C. Magnesium chloride is replaced by the adhesive solution, under the conditions that the caking capacity is guaranteed, both the use amount and the manufacture cost are reduced, the affect on the refining agent performance is reduced due to the existence of the excessive halogen family elements, the common heating replaced by the water vapor heating is adopted, the advantage of easy acquisition of the water vapor of the metallurgy enterprises can be displayed, and the ladle furnace molten steel refining agent and the preparation method are favorable for energy consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of molten steel refining agents, and in particular relates to a molten steel refining agent for a ladle furnace and a preparation method thereof. Background technique [0002] Social development has put forward higher and higher requirements for steelmaking productivity and cost, as well as the quality of steel products. To meet this requirement, refining outside the furnace, especially ladle furnace refining, has become an important production process in the modern steelmaking process and has been widely used in various metallurgical enterprises. One of the main metallurgical functions of ladle furnace refining is to use refining agent to refine molten steel to achieve the purpose of reducing the content of oxygen, sulfur and inclusions in molten steel. [0003] The Chinese patent application with application number 200710052744.8 discloses a molten steel refining agent and a preparation method thereof. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 倪红卫甘万贵何环宇朱跃刚张华程勇
Owner 武汉钢铁有限公司
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