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Preparation and application method of molten steel covering flux

A covering agent, molten steel technology, applied in the field of iron and steel metallurgy, can solve the problems of crusting, covering agent dust, poor protection and pouring, etc., to improve the operating environment, reduce dust pollution, and reduce inclusion defects.

Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The ladle slag detection equipment fails, causing the ladle steel slag to enter the tundish molten steel, causing the molten steel to increase oxygen (the oxygen content in the ladle slag is high)
[0005] 2. In the continuous casting process, poor pouring protection often occurs, causing air to enter the molten steel in the tundish, oxygen dissolves into the molten steel to form inclusions, and the conventional tundish covering agent cannot absorb the oxygen in the molten steel
[0006] 3. The covering agent has a lot of dust and pollutes the environment, and at the same time, the melting uniformity in the ladle is poor
Although these research results can absorb the inclusions in the molten steel to a certain extent, because the method of increasing the alkalinity of the covering agent is used to absorb the inclusions, it is easy to cause the viscosity of the covering agent to increase and the crusting during use, resulting in molten steel in the tundish and covering. The agent separates into the air
It can no longer meet the requirements of smelting high-quality and pure steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Feeding:

[0024] The content by weight of the raw material components of the covering agent is: CaO 20%, SiO 2 50%, MgO 6%, Al 2 O 3 7%, Fe 2 O 3 4%, Solid C 12.5%, S0.10%, H 2 O 0.4%.

[0025] The melting point of the covering agent is 1280°C, and the melting rate is 83s -1 , the bulk density is 0.85g / cm 3 .

[0026] (2. Mixing:

[0027] The raw materials are fully mixed in the mixer, and the mixing time is 2h.

[0028] 3. Drying:

[0029] The mixed mixture was dried at low temperature under nitrogen protective atmosphere, the drying temperature was 58°C, and the drying time was 3.5h, to obtain a spherical particle covering agent with a particle size of ≤1.0mm.

[0030] 4. Use:

[0031] The covering agent is directly added to the molten steel surface in the molten steel tank after tapping, and the amount added is 0.9kg / ton of steel.

Embodiment 2

[0033] 1. Feeding:

[0034] The weight percentage of the raw material components of the covering agent is: CaO 32%, SiO 2 35%, MgO 7%, Al 2 O 3 10% Fe 2 O 3 5%, Solid C 10.6%, S0.08%, H 2 O 0.32%.

[0035] The melting point of the covering agent is 1330℃, and the melting rate is 90s -1 , the bulk density is 0.79g / cm 3 .

[0036] 2. Mixing:

[0037] The raw materials are fully mixed in the mixer, and the mixing time is 1.6h;

[0038] 3. Drying:

[0039] The mixed material was dried at low temperature under nitrogen protective atmosphere, the drying temperature was 65°C, and the drying time was 2.5h, to obtain a spherical particle covering agent with a particle size of ≤1.0mm.

[0040] 4. Use:

[0041] The covering agent is directly added to the molten steel surface in the continuous casting tundish, and the added amount is 0.8 kg / ton of steel.

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PUM

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Abstract

The invention provides a preparation and application method of a molten steel covering flux. Raw material ingredients of the molten steel covering flux comprise 5-40% of CaO, 26-60% of SiO2, 4-8% of MgO, 5-11% of Al2O3, 3-6% of Fe2O3, 0-20% of solid C, less than or equal to 0.10% of S, and less than or equal to 0.5% of H2O. The melting point is 1200-1360 DEG C. The melting speed is 70-100 s<-1>. The volume density is 0.8+ / -0.2 g / cm<3>. Raw materials are blended in a blender for 1-3 h and then are subjected to low-temperature drying treatment in a nitrogen protective atmosphere after being blended evenly. The drying temperature is 50-70 DEG C. The drying time is 1-4 h. The covering flux is directly added to the surface of molten steel in a molten steel tank after tapping of molten steel or directly added to the surface of molten steel in a continuous casting tundish. The addition quantity of the covering flux is 0.7-1 kg in each ton of steel. By means of the method, oxygen and nitrogen in molten steel can be remarkably decreased, so that inclusion defects of casting blanks are reduced, and the quality of the casting blanks is improved. Meanwhile, dust pollution is effectively reduced, and the field operating environment is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a molten steel covering agent used in a steel-making molten steel tank or a continuous casting tundish. Background technique [0002] In the process of steelmaking and continuous casting, it is necessary to add a covering agent to the surface of the molten steel in the molten steel tank and the tundish. Its function is to protect the molten steel from contacting the air, so as to prevent the oxygen in the air from entering the molten steel and cause inclusions; and to heat the molten steel. In order to meet the needs of steelmaking and continuous casting molten steel for pouring temperature. In addition, the inclusions in the molten steel are adsorbed by the covering agent. [0003] But at present, in the process of steelmaking and continuous casting, there are still the following problems: [0004] 1. The failure of the slag detection equipment in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111C21C7/00C21C7/04C21C7/06
Inventor 魏元张丽娜王彬张健李伟东赵淑梅李俊峰曹阳
Owner ANGANG STEEL CO LTD
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