Method for shorting slag-splashing converter protection time of converter

A technology of slag splashing to protect furnaces and converters, which is applied in the manufacture of converters, etc., can solve the problems of slag temperature and slag splashing for a long time, and achieve the effects of reducing slag splashing time, simple method, and improving efficiency

Active Publication Date: 2013-06-26
SHOUGANG CORPORATION
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for shortening the time of slag splashing in converter smelting and protecting the furnace, using the existing conditions to solve the slag splashing time caused by the difference in the oxidation of molten steel at the end of the converter, the slag temperature and the unstable viscosity. long question

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The steel type is pipeline steel X80, the steel output of the converter is 100 tons, and the production process is "Molten Iron Pretreatment - Converter - Ladle Furnace Refining - RH Vacuum Treatment - Continuous Casting". Measure the oxygen activity and molten steel temperature at the end point, the oxygen activity is 1230ppm, the temperature is 1715°C, and the steel is tapped, the slag discharge angle of the converter is calculated to be 144.5°, the amount of quenching and tempering coolant is 744kg, and the quenching and tempering coolant is 100wt %dolomite.

[0022] After tapping, the converter is tilted to 144.5° for slag removal. The slag removal time is 75 seconds. After slag removal, 744 kg of quenching and tempering coolant is added, and then nitrogen is blown from the top to protect the furnace by slag splashing. The time for slag splashing is 215 seconds. The composition of steel slag before and after slag splashing is shown in Table 1.

[0023] Table 1 Comp...

Embodiment 2

[0028] The steel type is Q345, the steel output of the converter is 150 tons, the production process is "hot metal pretreatment-converter-ladle furnace refining-continuous casting", the C% of molten steel for converter tapping is 0.065wt%; Molten steel temperature, oxygen activity is 430ppm, temperature is 1665°C, steel is tapped, calculated converter slag discharge angle is 162.1°, quenching and tempering coolant addition is 618kg, quenching and tempering coolant is 100wt% limestone.

[0029] After tapping, the converter is tilted to 162.1° for slag removal. The slag removal time is 67 seconds. After the slag removal, 618 kg of quenching and tempering coolant is added, and then top blowing nitrogen is used to protect the furnace by splashing slag. The time for protecting the furnace by slag splashing is 186 seconds. The composition of steel slag before and after slag splashing is shown in Table 2.

[0030] Table 2 Composition of steel slag before and after splashing, wt%

[...

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Abstract

The invention provides a method for shorting slag-splashing converter protection time of a converter, belonging to the technical field of converter steelmaking. Proper residue quantity is obtained by controlling the deslagging titling angle of the converter after smelting, and hardening and tempering refrigerant is added, and the aim of quick slag splashing can be reached by means of top blowing or top-bottom combined blowing. The deslagging titling angle of the converter and the adding quantity of the hardening and tempering refrigerant can be computed according to the oxygen activity and the temperature of molten steel measured at the final point of the converter, wherein the computation formula of the deslagging titling angle A of the converter is as follows: A=-0.022ao+171.6 degrees, and the computation formula of the adding quantity S of the hardening and tempering refrigerant is as follows: S=0.0003558t2-1.136t+909.2. The hardening and tempering refrigerant consists of limestone and dolomite, wherein the weight percentage is 0-100%. The method has the advantages that the problem of long slag-splashing time caused by unstable residue quantity, slag temperature and viscosity because of different molten steel oxidizability at the final point of the converter can be solved by the existing conditions, and the slag-splashing converter protection time can be shortened.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a method for shortening the converter slag splash protection time, and is especially suitable for when the smelting end point temperature and oxidizability fluctuate greatly. Background technique [0002] Converter steelmaking has many advantages such as high efficiency, fast pace, large output, and low energy consumption. In the past, the furnace lining was repaired after tapping, and gunning materials and tar dolomite bricks were usually used as raw materials for repairing the furnace lining. This not only consumed a large amount of refractory materials, but also required heavy labor. Therefore, in recent years, a method of converter slag splashing to protect the furnace has been developed. This method is to leave all or part of the final slag after the converter is tapped. According to the situation, no or an appropriate amount of slag adjustment agen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 刘金刚姜中行朱志远李战军王文军孙硕猛危尚好许东利郝宁王彦锋王立峰孙齐松张利君柴玉国闫新慧
Owner SHOUGANG CORPORATION
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