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Energy-saving and environmental-protection type converter slag-splashing furnace-protection slag-adjusting method

A technology of slag splashing to protect the furnace and converter, which is applied in the direction of manufacturing converters, etc., can solve the problems of environmental pollution and high cost of converter steelmaking, and achieve the effects of reducing harm, saving steelmaking costs, and achieving significant economic and social benefits.

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

[0006] These slag splashing furnace protection processes use minerals rich in magnesium oxide as slag adjustment agents in the slag adjustment treatment stage, so there is a certain purchase cost, resulting in problems such as high cost of converter steelmaking and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] For 260 tons of converter smelting in a certain factory, implement the present invention:

[0020] The operation steps are as follows:

[0021] After the converter is blown, the steel is tapped at 1670°C, and the slag operation is adopted after tapping. The slag amount is 1.7% of the nominal capacity of the converter, and the slag amount is calculated to be about 4500Kg. After tapping, 34Kg of coke was added to the slag left in the converter, and 212Kg of magnesia coating after use was used as a regulator for slag splashing and furnace protection to carry out slag adjustment treatment. The content of iron oxide in the slag after adjustment was 12% by weight. The magnesium oxide content is 12% by weight.

[0022] After adding the slagging agent, carry out the slag splashing operation to protect the furnace. The pressure of the nitrogen gas blown into the oxygen lance is 1.25Mpa, the distance between the lance head and the slag surface is controlled within the range of ...

Embodiment 2

[0025] For 260 tons of converter smelting in a certain factory, implement the present invention:

[0026] The operation steps are as follows:

[0027] The steel is tapped at 1680°C after converter blowing, and the slag operation is adopted after tapping. The slag amount is 2.3% of the nominal capacity of the converter, and the slag amount is calculated to be about 6000Kg. After tapping, add 66.7Kg of coke to the remaining slag in the converter, and use 483Kg of magnesia coating as a regulator for slag splashing and furnace protection to carry out slag adjustment treatment. After slag adjustment, the iron oxide content in the slag composition is 10% by weight , the weight percentage of magnesium oxide content is 15%.

[0028] After adding the slagging agent, carry out the slag splashing operation to protect the furnace. The pressure of the nitrogen gas blown into the oxygen lance is 1.4Mpa, the distance between the lance head and the slag surface is controlled within the rang...

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PUM

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Abstract

The invention discloses an energy-saving and environmental-protection type converter slag-splashing furnace-protection slag-adjusting method; after converter steelmaking tapping, a slag remaining operation is adopted; after tapping, coke is added into converter remaining slag, a used tundish magnesium coating as a slag adjusting agent is used for slag adjusting treatment on the remaining slag in the furnace, and then a slag splashing operation is carried out; the remaining slag amount after converter steelmaking tapping is 1-4% of the nominal capacity of the converter; the adding amount of the coke is 8-12% of the mass of the remaining slag after converter steelmaking tapping; the adding amount of the used tundish magnesium coating is 9-16% of the mass of the remaining slag after converter steelmaking tapping; when the slag splashing operation is carried out after remaining slag adjusting treatment, the pressure of slag splashing gas nitrogen gas is controlled to be 1.0-1.4 MPa, the flow quantity is controlled to be 750-900 Nm<3> / min; when the slag splashing operation is carried out after remaining slag adjusting treatment, the distance between a lance head and a slag surface is controlled to be in a range of 0.8-2.6 m, and a changable lance position is adopted; and the nitrogen gas is blown for 3-4 min.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to an energy-saving and environment-friendly converter slag splashing protection furnace slag adjustment treatment method. Background technique [0002] Converter slag splashing protection technology is a relatively mature technology developed in the past 20 years. It has been widely used in major steel mills and has significantly increased the service life of converters. The method is to leave part of the final slag after the converter is tapped, and add an appropriate amount of slag adjusting agent to make the slag have a suitable viscosity and refractoriness, and then use an oxygen lance to blow high-pressure nitrogen gas to the slag to impact the slag, so that the slag splashes to the On the furnace lining, a layer of corrosion-resistant protective layer is formed on the surface of the furnace lining to achieve the purpose of protecting the furnace lining. When th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
Inventor 吕春风李超尚德礼张立夫廖相巍康磊尹宏军张维维曲余铃马宁
Owner ANGANG STEEL CO LTD