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Method for increasing semi-steel heat source

A heat source, steel water technology, applied in the direction of manufacturing converters, etc., can solve the problems of high cost and poor carbon increase effect, and achieve the effect of ensuring utilization rate, good utilization rate, and wide source of raw materials

Inactive Publication Date: 2019-11-12
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

[0004] In order to solve the technical problems of high cost and poor carburizing effect in the prior art, the present invention provides a method for increasing the heat source of semi-steel. When the semi-steel molten iron satisfies any of the following conditions: A. Water C<3.2%; B. The temperature of semi-steel molten steel is less than 1300°C. During the process of semi-steel tapping, the carburizer and silicon raw materials are injected into the ladle through the injection system to supplement the semi-steel heat source

Method used

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  • Method for increasing semi-steel heat source

Examples

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Effect test

Embodiment 1

[0026] In a steel factory, semi-steel was produced from a 120-ton vanadium-extracting converter. The semi-steel ladle contained 140 tons of molten iron, and 200kg of the mixture of the above-mentioned recarburizer and silicon raw material was injected. The comparison of the composition of the semi-steel before and after is shown in Table 1:

[0027] Table 1 Comparison of semi-steel composition and temperature before and after

[0028] semi-steel C / ％ Si / % V / ％ Mn / % temperature / ℃ Before carburization 3.15 0.02 0.03 0.02 1325 After carbonization 3.22 0.07 0.03 0.02 1323

[0029] During the semi-steel process of the vanadium extraction converter, the gas injection pressure of the auxiliary blowing system is 0.3Mpa, and the mixed material can enter the main pipeline smoothly. The injection pressure of the main blowing system is 0.55Mpa, and the injection speed is 50kg / min. The C content is 3.2% before spraying the mixed material. After only ...

Embodiment 2

[0031] In a steel factory, semi-steel was produced from a 120-ton vanadium-extracting converter. The volume of semi-steel ladle was 140t of molten iron, and 300kg of the mixture of the above-mentioned recarburizer and silicon raw material was injected. The composition of the semi-steel before and after is compared as shown in Table 2:

[0032] Table 2 Comparison of semi-steel composition and temperature before and after

[0033]

[0034]

[0035] During the semi-steel process of the vanadium extraction converter, the gas injection pressure of the auxiliary blowing system is 0.35Mpa, and the mixed material can enter the main pipeline smoothly. The injection pressure of the main blowing system is 0.57Mpa, and the injection speed is 55kg / min. The C content is 3.22% before spraying the mixed material, and only spraying 300kg mixed material, the C content of the semi-steel increases by 0.11%, and the silicon content of the semi-steel increases by 0.09%, which can achieve a goo...

Embodiment 3

[0037] In a steel factory, semi-steel was produced from a 120-ton vanadium-extracting converter. The volume of semi-steel molten iron was 140 tons of molten iron, and 270 kg of the above-mentioned mixture of carburizer and silicon raw material was injected. The composition of the semi-steel before and after is compared as shown in Table 3:

[0038] Table 3 Comparison of semi-steel composition and temperature before and after

[0039] semi-steel C / ％ Si / % V / ％ Mn / % temperature / ℃ Before carburization 3.18 0.02 0.03 0.02 1310 After carbonization 3.27 0.10 0.03 0.02 1305

[0040] During the semi-steel process of the vanadium extraction converter, the gas injection pressure of the auxiliary blowing system is 0.31Mpa, and the mixed material can enter the main pipeline smoothly. The injection pressure of the main blowing system is 0.52Mpa, and the injection speed is 50kg / min. The C content is 3.2% before spraying the mixed material, and only 25...

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Abstract

The invention discloses a method for increasing a semi-steel heat source, and belongs to the technical field of steel smelting. In order to solve the technical problems of high cost and poor recarburization effect of a semi-steel heat supplementing mode in the prior art, the method for increasing the semi-steel heat source is provided, and when molten semi-steel meets any one of following conditions: A, C content of the molten semi-steel is lower than 3.2% and B, temperature of the molten semi-steel is lower than 1,300 DEG C, a recarburizer and a silica raw material are blown into a steel ladle by a blowing injection system in a semi-steel discharging process so as to supplement the semi-steel heat source. With the adoption of the method, rapid melting of the recarburizer and the silica raw material can be realized in the temperature range of the molten semi-steel, good utilization rate and recarburization effect are guaranteed, the recarburizer and the silica raw material are cheap, and the raw materials are widely sourced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for increasing a heat source for semi-steel. Background technique [0002] Pangang Group and other blast furnaces using vanadium-titanium magnetite in Panxi area have low content of heating elements such as silicon and manganese in molten iron and high content of sulfur. In the process of vanadium extraction by converter, in order to better oxidize vanadium into vanadium slag, transitional deep blowing is often required to achieve the purpose of deep vanadium extraction; but the result of doing so often results in a large amount of oxidation of C content in semi-steel, In this way, semi-steel cannot meet the smelting conditions during converter steelmaking in the subsequent process, and forced steelmaking will cause the temperature or composition of molten steel at the end to fail to meet the requirements of the steel type, resulting in a seri...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C5/28
CPCC21C5/28C21C7/0025
Inventor 梁新腾曾建华戈文荪陈均陈炼
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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