Method for increasing heat source by semi-steel

Abstract

The invention discloses a method for increasing heat source by semi-steel and belongs to the technical field of steel and iron smelting. By means of the method for increasing heat source by semi-steel, the technical problem that in the prior art, the semi-steel heat supplementing manner is high in the cost and poor in the recarburization effect is solved. When semi-steel molten iron satisfies either of the following conditions that carbon in the semi-steel molten iron is smaller than 3.1%, or the temperature of the semi-steel molten iron is lower than 1300 DEG C, in the tapping process of semi-steel, a recarburizer, a siliceous raw material and aluminum powder are blown and injected to steel ladles through an injection system, and semi-steel heat source is supplemented. By means of the method for increasing heat source by semi-steel, it can be guaranteed that rapid melting of the recarburizer and the siliceous raw material is achieved within the temperature range of the semi-steel molten steel, and good utilization rate and the recarburization effect are guaranteed; and the recarburizer and the siliceous raw material are low in price and wide in the raw material source.

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...

Examples

Embodiment 1

[0026] In a steel factory, 120 tons of vanadium extracting converter produced semi-steel, semi-steel molten iron was packed with 140t molten iron, and 240kg of the above-mentioned temperature-raising mixture was injected. The composition of semi-steel before and after is compared as shown in Table 1:

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

[0028] semi-steel C / ％ Si / % Al / ％ Mn / % temperature / ℃ Before carburization 3.0 0.02 0.03 0.02 1330 After carbonization 3.06 0.07 0.07 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 3.0% before spraying the mixed material. After only injecting 200kg of the mixed material, th...

Embodiment 2

[0031] In a steel plant, semi-steel was produced from a 120-ton vanadium-extracting converter. The semi-steel molten iron was packaged with 140 tons of molten iron, and 240kg of the above-mentioned temperature-raising mixture 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] semi-steel C / ％ Si / % Al / ％ Mn / % temperature / ℃ Before carburization 3.02 0.02 0.01 0.02 1328 After carbonization 3.09 0.10 0.07 0.02 1325

[0034] 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 was 3.02% before the mixed material was injected, and only 300kg of the ...

Embodiment 3

[0036] In a steel factory, 120 tons of vanadium-extracting converter produced semi-steel. The semi-steel molten iron was packaged with 140t of molten iron, and 210kg of the above-mentioned temperature-raising mixture was injected. The composition of the semi-steel before and after is compared as shown in Table 3:

[0037] Table 3 Comparison of semi-steel composition and temperature before and after

[0038] semi-steel C / ％ Si / % Al / ％ Mn / % temperature / ℃ Before carburization 3.05 0.012 0.01 0.02 1330 After carbonization 3.11 0.064 0.06 0.02 1325

[0039] 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 3.05% before the mixed material is injected, and only 250kg of the mixed mat...

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...

Examples

Embodiment 1

[0026] In a steel factory, 120 tons of vanadium extracting converter produced semi-steel, semi-steel molten iron was packed with 140t molten iron, and 240kg of the above-mentioned temperature-raising mixture was injected. The composition of semi-steel before and after is compared as shown in Table 1:

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

[0028] semi-steel C / ％ Si / % Al / ％ Mn / % temperature / ℃ Before carburization 3.0 0.02 0.03 0.02 1330 After carbonization 3.06 0.07 0.07 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 3.0% before spraying the mixed material. After only injecting 200kg of the mixed material, th...

Embodiment 2

[0031] In a steel plant, semi-steel was produced from a 120-ton vanadium-extracting converter. The semi-steel molten iron was packaged with 140 tons of molten iron, and 240kg of the above-mentioned temperature-raising mixture 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] semi-steel C / ％ Si / % Al / ％ Mn / % temperature / ℃ Before carburization 3.02 0.02 0.01 0.02 1328 After carbonization 3.09 0.10 0.07 0.02 1325

[0034] 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 was 3.02% before the mixed material was injected, and only 300kg of the ...

Embodiment 3

[0036] In a steel factory, 120 tons of vanadium-extracting converter produced semi-steel. The semi-steel molten iron was packaged with 140t of molten iron, and 210kg of the above-mentioned temperature-raising mixture was injected. The composition of the semi-steel before and after is compared as shown in Table 3:

[0037] Table 3 Comparison of semi-steel composition and temperature before and after

[0038] semi-steel C / ％ Si / % Al / ％ Mn / % temperature / ℃ Before carburization 3.05 0.012 0.01 0.02 1330 After carbonization 3.11 0.064 0.06 0.02 1325

[0039] 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 3.05% before the mixed material is injected, and only 250kg of the mixed mat...

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