Molten steel refining agent and preparation method

A refining agent and ladle furnace refining technology, applied in the field of molten steel refining agents, can solve the problems of environmental pollution, high production cost, large power consumption, etc., to solve environmental pollution and resource reuse, reduce production costs, and simplify production processes. Effect

Inactive Publication Date: 2009-03-11
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

The above method needs to consume a large amount of natural resources such as lime and bauxite, consumes a lot of electricity, and has high production costs. Therefore, the price of the premelting refining agent is very high, which greatly increases the smelting cost of the iron and steel enterprise. At the same time, after the ladle furnace is refined A large amount of refining waste generated also caused serious environmental pollution and a large waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] First, 60wt%-65wt% of X70 pipeline ladle furnace refining waste slag, 13wt%-15wt% of CaO, 22wt%-25wt% of Al 2 o 3 Mix it into a solid material, then mix it with brine whose weight accounts for 15wt%~18wt% of the weight of the solid material, and then granulate it, then put it into a heating furnace and heat it at 600°C~650°C for 1.5~2 hours, and then cool it naturally after taking it out of the furnace .

[0014] Among them, the main chemical composition of X70 pipeline steel ladle furnace refining waste slag is: CaO 45-53%, Al 2 o 3 26-30%, SiO 2 11~14%, 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 0.1mm ~ 4mm; the brine concentration is 5% ~ 8%; after mixing, the granulation is to make the mixture into balls through a disc ball machine, and the effective particle size is 20 ~ 25mm.

[0015] The refining agent prepared in this example has a melting point of 1345° C. to ...

Embodiment 2

[0017] First, 75wt%-80wt% cold pier steel ladle furnace refining slag, 6wt%-8wt% CaO, 14wt%-17wt% Al 2 o 3 Mix, then fully mix with brine whose weight accounts for 19wt%-21wt% of the solid material weight, and then granulate, then put it into a heating furnace and heat it at 750°C-800°C for 2-2.5 hours, and let it cool naturally after taking it out of the furnace.

[0018] Among them, the main chemical composition of the refining waste slag of cold pier steel ladle furnace is: CaO is 55-60%, Al 2 o 3 18-25%, SiO 2 8-10%, 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 the mixture is 0.1mm to 4mm, and the brine concentration is 15% to 20%. After mixing, the granulation is to shape the mixture through a press, and the effective particle size is 10 to 20mm.

[0019] The refining agent prepared in this example has a melting point of 1340° C. to 1350° C., a slagging time of 3 to 5 minut...

Embodiment 3

[0021] First, 85wt%-90wt% of X70 pipeline ladle furnace refining waste slag, 4wt%-6wt% of CaO, 6wt%-9wt% of Al 2 o 3 Mix, then fully mix with brine whose weight accounts for 23wt%-25wt% of the solid material, and then granulate, then put into a heating furnace and heat at 800°C-850°C for 2-3 hours, and cool naturally after taking out the furnace.

[0022] Among them, the main chemical composition of X70 pipeline steel ladle furnace refining waste slag is: CaO 45-53%, Al 2 o 3 26-30%, SiO 2 11~14%, 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 0.1mm~4mm, and the brine concentration is saturated; after mixing, the granulation is to make the mixture into balls through a disc ball machine, and the effective particle size is 5~25mm.

[0023] The melting point of the refining agent prepared in this embodiment is 1325°C-1335°C, the slagging time in the ladle furnace is 2-4 minutes, and ...

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Abstract

This invention discloses molten steel refining agent contains mainly of: 60-90 wt% lable furnace refinery slag, 4-15 wt% of CaO, 6-25wt% of Al2O3 mixture and saturated magnesium chloride solution with concentration of 5wt% at the percentage of 15-25 wt% of said mixture. The method for preparing this inventive agent is: mixing above-mentioned components and then making pellets, then heating them at 600-900 deg.C for 1.3-3 Hrs, and natural cooling after taking them out of the oven. This invented product has advantages of: quick melting of slag and excellent metallurgic effect, better desulphuration of 60-70% with adding 3-6 kg of the agent per ton of steel.

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] With the development of science and technology, iron and steel production has put forward higher and higher requirements on the productivity and cost of steelmaking and the quality of 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 currently used ladle furnace molten steel refining agents are mainly divided into two categorie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCY02P10/20
Inventor 倪红卫朱跃刚何环宇甘万贵张华吴江红
Owner 武汉钢铁有限公司
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