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Molten steel smelting method of mammoth converter

A molten steel smelting and large-scale converter technology, applied in the manufacture of converters, etc., can solve the problems of inability to remove harmful elements in molten iron, low production efficiency, and affecting the quality of molten steel, and achieve the effects of shortening smelting time, increasing production efficiency, and improving molten steel quality

Inactive Publication Date: 2020-05-22
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method for smelting molten steel in a large-scale converter to at least solve the problems of inability to remove harmful elements in molten iron, affecting the quality of molten steel, and low production efficiency during smelting in a converter in the past.

Method used

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  • Molten steel smelting method of mammoth converter
  • Molten steel smelting method of mammoth converter
  • Molten steel smelting method of mammoth converter

Examples

Experimental program
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Embodiment 1

[0039] The oxygen lance nozzle provided in the molten steel smelting method using a large converter, that is, the throat diameter of the oxygen lance nozzle is 43.5mm, the outlet diameter of the oxygen lance nozzle is 57mm, the included angle of the oxygen lance nozzle is 13-14°, and the oxygen supply intensity is 4.0m 3 / (t min), and set the oxygen supply flow rate to 42000Nm during the blowing process 3 / h. Observe the impact depth and impact area formed by the oxygen flow when the oxygen lance nozzle is used for high-intensity oxygen supply. The specific data are shown in Table 1.

[0040] Table 1:

[0041]

[0042] in, figure 1 Impact area and impact depth plots for oxygen flow.

Embodiment 2

[0052] The oxygen supply time of Example 1 was compared with that of Comparative Example 1, and the specific data are shown in Table 4.

[0053] Table 4:

[0054] serial number Number of test furnaces / furnace Working pressure / MPa Average oxygen supply flow / Nm 3 / h

[0055] As can be seen from Table 4, when adopting the molten steel smelting method of large-scale converter in embodiment 1 to carry out oxygen blowing, compared with adopting the existing oxygen lance oxygen blowing in comparative example 1, shortened oxygen supply time and reached 5.3min, and then shortened smelting cycle, which improves the production efficiency of the converter. At the same time, adopting the oxygen lance operation method for large-scale converter smelting in 1 can reduce oxygen consumption, thereby reducing production costs.

Embodiment 3

[0057] The final slag components were compared between Example 1 and Comparative Example 1, and the specific data are shown in Table 5.

[0058] table 5:

[0059] serial number FeO% TFe% P 2 o 5 %

[0060] As can be seen from Table 5, when adopting the molten steel smelting method of the large-scale converter in Example 1 to smelt, compared with adopting the existing oxygen lance in Comparative Example 1 to smelt, the FeO and TFe contents in the final slag all decrease to some extent, indicating that The utilization rate of Fe has increased, and the content of phosphorus pentoxide in the final slag has increased, indicating that the dephosphorization rate has increased, and the alkalinity has decreased, indicating that the consumption of slagging materials has been reduced. It can be seen that when the molten steel smelting method of the large-scale converter in Example 1 is used for smelting, the quality of molten steel can be effectively improved and the ...

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Abstract

The invention discloses a molten steel smelting method of a mammoth converter. In the converter blowing process, the position of an oxygen lance is adjusted in real time according to the blowing process; as a whole, the position of the oxygen lance is moderate when blowing is started, the position of the oxygen lance is lowered during the slag incoming period, the position of the oxygen lance is raised before drying return, and the position of the oxygen lance is lowered before a sublance is tested, so that the oxygen lance is adjusted in the form of a moderate position, a low position, a highposition and a low position in the whole process of converter blowing, the height of the oxygen lance is adjusted according to different molten iron conditions and scrap steel conditions, the oxygensupply intensity is further adjusted to be 3.8 to 4.0m<3> / (t.min) and can be always at a stable state in the whole blowing process, the occurrence of splashing is avoided, the molten steel quality isimproved, the oxygen blowing time can be shortened due to the improvement of the oxygen supply intensity, the production efficiency of the converter is effectively improved, the smelting time is shortened, and the production cost is reduced.

Description

technical field [0001] The disclosure of the invention relates to the technical field of molten steel smelting, in particular to a large-scale converter molten steel smelting method. Background technique [0002] With the progress of society and the development of science and technology, people's demand for steel is getting higher and higher, and the requirements for steel quality are also increasing. In the iron and steel smelting process, the converter process is one of the very important links. Especially in the converter process, the formulation and implementation of the oxygen supply process and feeding plan will directly affect the quality of molten steel, production efficiency and energy utilization, and then affect the quality of the final steel. [0003] At present, when domestic large-scale converters of more than 150 tons are smelting molten steel, the oxygen supply intensity of the oxygen lance can only be controlled at 3.0-3.5m 3 / (t·min), once the intensity o...

Claims

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Application Information

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IPC IPC(8): C21C5/32
CPCC21C5/32
Inventor 丛铁地彭飞张艳龙魏建华薛长江郭宗昶
Owner BENGANG STEEL PLATES
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