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A method of converter tapping

A converter and tapping process technology, applied in the direction of manufacturing converters, etc., can solve the problem of high production cost, and achieve the effect of low cost, sufficient source and good effect

Active Publication Date: 2016-03-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can enable most converters to tap steel directly without downturning the furnace and obtain a better effect of slag splashing to protect the furnace, it has certain economic and social benefits, but due to the need to use anthracite, the production cost is relatively high

Method used

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  • A method of converter tapping

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Effect test

Embodiment 1

[0027] This embodiment is used to illustrate the converter tapping method provided by the present invention.

[0028] A factory has a 120t converter with a tapping volume of 130t. During the tapping process of the converter, limestone (containing 98% by weight of CaCO in the limestone) is added to the converter in which molten steel at 1700°C is tapped. 3 , the particle size of limestone is less than 25mm, and the particle size of 95% by weight is 5-20mm), the add-on of limestone is 1.5kg limestone / ton steel, obtains the molten steel that temperature is 1680 ℃ and temperature is 1450 ℃, Slag with a viscosity of 0.6 Pa·s containing 35% by weight of CaO and 15% by weight of SiO 2 , 15% by weight of MgO, 7% by weight of MnO, 25% by weight of FeO, 3% by weight of Al 2 o 3 , and then the slag is splashed to protect the furnace by a conventional method to form a slag splash layer with a thickness of 5 mm. The service life of the slag-splashing layer is up to 20 furnaces, so it c...

Embodiment 2

[0030] This embodiment is used to illustrate the converter tapping method provided by the present invention.

[0031] A factory has a 120t converter with a tapping volume of 133t. During the tapping process of the converter, limestone (containing 98% by weight of CaCO in the limestone) is added in the converter in which molten steel at 1670°C is tapped. 3 , the particle size of limestone is less than 25mm, and the particle size of 92% by weight is 5-20mm), the add-on of limestone is 1.1kg limestone / ton steel, obtains the molten steel that temperature is 1650 ℃ and temperature is 1400 ℃, Slag with a viscosity of 0.7 Pa·s containing 45% by weight of CaO and 10% by weight of SiO 2 , 12% by weight of MgO, 7% by weight of MnO, 23% by weight of FeO, 3% by weight of Al 2 o 3 , and then the slag is splashed to protect the furnace by conventional methods to form a slag splash layer with a thickness of 6mm. The service life of the slag-splashing layer is up to 15 furnaces, so it can...

Embodiment 3

[0033] This embodiment is used to illustrate the converter tapping method provided by the present invention.

[0034]A factory has a 120t converter with a tapping volume of 135t. In the converter tapping process, add limestone (contain 98% by weight of CaCO in the limestone in the converter that the molten steel of 1660 ℃ is tapped inside is housed, the particle size of limestone is less than 25mm, and the particle size of the particle of 98% by weight is 5-20mm), the addition of limestone is 2.3kg limestone / ton of steel, after the completion of tapping, the molten steel with a temperature of 1600°C and the slag with a temperature of 1430°C and a viscosity of 0.55Pa·s are obtained, and the slag contains 40% by weight of CaO, 15% by weight SiO 2 , 15% by weight of MgO, 8% by weight of MnO, 20% by weight of FeO, 2% by weight of Al 2 o 3 , and then the slag is splashed to protect the furnace by conventional methods to form a slag splash layer with a thickness of 7mm. The serv...

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Abstract

The invention discloses a converter tapping method which comprises the following steps: adding a furnace slag regulator into molten steel in a converter tapping process, and performing converter slag splash protection on residual furnace slag after tapping, wherein the furnace slag regulator is limestone. The method disclosed by the invention can achieve a very good converter slag splash protection effect and has an industrial application prospect.

Description

technical field [0001] The invention relates to a method for tapping steel from a converter. Background technique [0002] The basic principle of slag-splashing furnace protection is that after the converter is tapped, the slag remains in the converter, and nitrogen is blown into the slag through the spray gun, so that the slag splashes and adheres to the furnace lining, forming a protective layer for the furnace lining and reducing the steelmaking process. Mechanical erosion and chemical erosion of the furnace lining, so as to achieve the purpose of protecting the furnace lining and improving the service life of the furnace. [0003] "Practice and analysis of scrap steel slag used for slag adjustment in converter steelmaking" (Gong Hongjun, Sichuan Metallurgy, Vol. Modification treatment, and then the obtained slag is splashed to protect the furnace, and it is specifically mentioned that in practice, the mode of anthracite plus scrap steel slag can be used to adjust the fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/44
Inventor 梁新腾曾建华李扬洲龚洪君杨森祥杨晓东喻林陈均何为陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP