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Method of protecting furnace by slag splashing in semi-steelmaking

A technology of slag splashing to protect the furnace and slag splashing, which is applied in the field of metallurgy and steelmaking, can solve the problems of slag formation, heat shortage, price increase, poor fluidity, etc., and achieve the effect of low self-cost, waste reduction and cost reduction

Active Publication Date: 2019-04-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For iron and steel enterprises using vanadium-titanium magnetite as raw material, the molten iron used for steelmaking contains a certain amount of trace elements such as vanadium and titanium. Traces of elements such as Mn, resulting in single slag components, high alkalinity, high viscosity, and poor fluidity, resulting in slagging and insufficient heat, so it is not suitable for slag splashing to protect the furnace
[0003] In the existing technology, various composite slag control agents are added to improve the effect of slag splashing and furnace protection. However, due to the deep processing of such composite slag control agents to varying degrees, it will inevitably lead to an increase in price, thereby increasing the cost of steelmaking processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Send the prepared waste ladle lining bricks, raw dolomite and limestone to the high-level materials respectively, among which the MgO in the waste ladle lining bricks is 18.8wt%, Al 2 o 3 The content is 63.6 wt%, the C content is 8.4 wt%, and the particle size is 18mm; the CaO in the limestone is 51.2wt%, and the SiO 2 is 2.7wt%, S is 0.039%, and the particle size is 25mm;

[0033] (2) The carbon at the end point of the converter is 0.11%. After tapping, all the slag is left, and 2kg / t of waste ladle lining bricks are added to the converter, and the converter is shaken back and forth once to pre-deoxidize the slag.

[0034] (3) Start the slag splashing operation by lowering the gun and blowing nitrogen. The nitrogen pressure is 1.0MPa, and the gun position is 1.4m. After blowing nitrogen for 20 seconds, add 1.5 kg / t of limestone into the converter. After 1.5 minutes of slag splashing, the nitrogen pressure is adjusted to Between 1.2MPa, the gun position is 1.15m, ...

Embodiment 2

[0036](1) Send the prepared waste ladle lining bricks, raw dolomite and limestone to high-level materials respectively, among which MgO in waste ladle lining bricks is 15.4wt%, Al 2 o 3 The content is 61.6 wt%, the C content is 8.6 wt%, and the particle size is 22mm; the MgO in the raw dolomite is 21.5wt%, the CaO is 34.4wt%, the S is 0.039%, and the particle size is 27mm; the CaO in the limestone is 49.5wt%, and the SiO 2 is 2.4wt%, S is 0.044%, and particle size is 19mm;

[0037] (2) When the carbon at the end point of the converter is 0.07%, after the steel tapping is completed, pour 1 / 2 of the slag in the furnace, add 3.4kg / t of waste ladle lining bricks into the converter, shake the converter back and forth once, and pre-deoxidize the slag. deal with.

[0038] (3) Start slag splashing by lowering the gun and blowing nitrogen. The nitrogen pressure is 1.2MPa and the gun position is 1.35m. After blowing nitrogen for 20 seconds, add raw dolomite 0.8 kg / t, limestone 2.5 kg / ...

Embodiment 3

[0040] (1) Send the prepared waste ladle lining bricks, raw dolomite and limestone to the high-level materials respectively, among which the MgO in the waste ladle lining bricks is 12.4wt%, Al 2 o 3 The C content is 60.2 wt%, the C content is 8.8 wt%, and the particle size is 28mm; the MgO in the raw dolomite is 20.3wt%, the CaO is 30.6wt%, the S is 0.041%, and the particle size is 23mm; the CaO in the limestone is 48.4wt%, and the SiO 2 is 2.3wt%, S is 0.049%, and the particle size is 26mm;

[0041] (2) When the carbon at the end point of the converter is 0.04%, pour out all the slag after tapping, add 4.5kg / t of waste ladle lining bricks into the converter, shake the converter back and forth twice, and pre-deoxidize the slag;

[0042] (3) Start the slag splashing operation by lowering the gun and blowing nitrogen. The nitrogen pressure is 1.3MPa, and the gun position is 1.2m. After blowing nitrogen for 20 seconds, add 1.8kg / t of waste ladle lining bricks, 2kg / t of raw dolom...

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Abstract

The invention discloses a slag-splashing protection method of semi-steel steelmaking, and belongs to the technical field of metallurgical steelmaking. The slag-splashing protection method comprises the steps that scrap ladle lining bricks, raw dolomite and limestone which are well prepared are delivered to an overhead bunker separately; after tapping of semi-steel steelmaking, part of or all slag in a furnace is chosen to be poured out according to a terminal situation, the scrap ladle lining bricks are added into a steel furnace, a furnace body is shaken back and forth, and then nitrogen-blowing slag splashing operation is conducted; and during the slag-splashing protection process, the scrap ladle lining bricks, the raw dolomite and the limestone are selectively put into the furnace, and slag is adjusted. According to the slag-splashing protection method of semi-steel steelmaking, the scrap ladle lining bricks in a steel factory are adopted to replace part of magnesium spatter materials or a special slag-splashing compound slag-modifier, so that the effects that the furnace life is prolonged and steelmaking cost is reduced are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and steelmaking, and in particular relates to a method for protecting a furnace by spattering slag in semi-steelmaking. Background technique [0002] The furnace life of the converter is a very important technical and economic indicator of the steelmaking production of the converter. To achieve the goal of extending the life of the converter at a low cost is an important measure to reduce costs and increase efficiency in the current severe steel situation. For iron and steel enterprises using vanadium-titanium magnetite as raw material, the molten iron used for steelmaking contains a certain amount of trace elements such as vanadium and titanium. Traces of elements such as Mn lead to single slag components, high alkalinity, high viscosity, and poor fluidity, resulting in slagging and insufficient heat, which is not suitable for slag splashing to protect the furnace. [0003] In the prior art, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/44
CPCC21C5/443Y02P10/20
Inventor 韩宇李彦军何晴翁玉娟袁娜张东
Owner HEBEI IRON AND STEEL
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