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Full-steel-scrap electric arc furnace cleanness rapid smelting method

A smelting method and electric arc furnace technology, applied in the field of electric arc furnace steelmaking, can solve the problems of small number of CO bubbles, low carbon content in molten pool, insufficient oxygen supply intensity, etc.

Active Publication Date: 2017-12-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low carbon content of the molten pool after the all-scrap electric arc furnace is melted, the oxygen supply intensity is insufficient, and the number of CO bubbles generated in the molten pool during decarburization in the later stage of smelting is small, and [N] in the molten steel cannot be effectively removed; the electric arc furnace adopts bottom blowing Ar stirring can denitrify, but the bottom blowing flow rate is low (30-100NL / min), and the denitrification effect is limited
The existing smelting process is basically unable to realize the deep denitrification of all-scrap electric arc furnace smelting

Method used

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Embodiment 1

[0027] Embodiment 1: The present invention is applied in 90t electric arc furnace steelmaking. Two spray guns are installed, distributed on both sides of the electric arc furnace door. The inner diameter of the spray guns is 12 mm, and the annular gap is 1 mm. They are made of stainless steel. The outlet of the spray gun is 800mm below the liquid steel surface, and the angle with the horizontal plane is 15°. The decarburization powder is graphite recarburizer, the dephosphorization powder is lime powder, the particle diameter is 50μm, and the single-gun powder spraying rate is 0-100kg / min. Carrier gas A is air, carrier gas B is oxygen, and the oxygen flow rate of a single gun is 50-800Nm 3 / h. Gap gas is N 2 , Ar or natural gas, the flow rate of a single gun is 10-200Nm 3 / h. Spray gun injection process see image 3 .

[0028] 1) After tapping the electric arc furnace and before adding the furnace charge, use the dephosphorization conveying pipeline to spray, spray the c...

Embodiment 2

[0040] Embodiment 2: The present invention is applied in 150t electric arc furnace steelmaking. Four spray guns are installed, which are evenly distributed on both sides of the electric arc furnace door. The outlet of the spray gun is 900mm below the liquid steel surface, and the angle with the horizontal plane is 10°. The decarbonization powder is carbon powder, the dephosphorization powder is lime powder, the particle diameter is 30μm, and the single-gun powder spraying rate is 0-50kg / min. Carrier gas A is N 2 , the carrier gas B is O 2 -CO 2 Mixed gas, single gun oxygen flow 50~600Nm 3 / h. Gap gas is N 2 , Ar or propane, the single gun flow rate is 10-200Nm 3 / h.

[0041] 1) After tapping the electric arc furnace and before adding the furnace charge, use the dephosphorization conveying pipeline to spray, spray the central pipe of the spray gun and the annular seam pipe to spray N 2 , the central tube flow rate is 100Nm 3 / h, the flow rate of the circular seam pipe ...

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Abstract

The invention belongs to the technical field of electric arc furnace steelmaking and particularly relates to a full-steel-scrap electric arc furnace cleanness rapid smelting method which is applicable to the 30-300t full-steel-scrap electric arc furnace smelting process. According to the full-steel-scrap electric arc furnace smelting process, spray guns buried in refractory materials on the side faces of the furnace bottom of an electric arc furnace are used for blowing different types of media at different smelting stages; at the stage of recarburization and melting acceleration, melting-down of a molten pool is accelerated through carburization, and the carbon content of the molten pool is increased. At the stage of high-efficiency dephosphorization and deep denitrification, molten pool reaction is intensified to conduct high-efficiency dephosphorization and deep denitrification. Accordingly, the smelting rhythm of the full-steel-scrap electric arc furnace is accelerated, the dephosphorization and denitrification effects are improved, the cleanness of molten steel is improved, and full-steel-scrap electric arc furnace cleanness rapid smelting is realized.

Description

technical field [0001] The invention belongs to the technical field of electric arc furnace steelmaking, and in particular relates to a clean and rapid smelting method for all scrap steel electric arc furnaces. Background technique [0002] When the electric arc furnace is smelted with an all-scrap charge structure, the input of electric energy is mainly used in the early stage of smelting, and the input of chemical energy is supplemented, but relying solely on high-power input of electric energy and chemical energy, its energy utilization efficiency is limited; The pool is viscous and has poor fluidity, which is not conducive to accelerating the melting of scrap steel. Therefore, the melting time in the actual EAF smelting of all scrap steel is relatively long, which greatly reduces the smelting rhythm of the EAF. [0003] On the other hand, the quality control of molten steel has always been a long-term technical problem in all-scrap EAF smelting, mainly focusing on the c...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/064C21C7/072
CPCC21C5/5264C21C7/0025C21C7/0645C21C7/072C21C2005/5258Y02P10/20Y02P10/143
Inventor 朱荣魏光升董凯赵婧鑫吴学涛唐天平王雪亮武文合胡绍岩王云
Owner UNIV OF SCI & TECH BEIJING
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