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Semi-steel steelmaking method

A steelmaking furnace and raw material technology, applied in the field of semi-steel steelmaking, can solve problems such as poor dephosphorization and desulfurization effects, and achieve stable dephosphorization and desulfurization effects.

Inactive Publication Date: 2009-10-14
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, in order to overcome the defects of poor dephosphorization and desulfurization effects in the semi-steel steelmaking method of the prior art, the present invention provides a semi-steel steelmaking method with excellent dephosphorization and desulfurization effects

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Embodiment 1

[0055] This embodiment is used to illustrate the semi-steel steelmaking method provided by the present invention.

[0056] Add 120 tons of vanadium-extracted semi-steel into the converter for smelting. The composition of the semi-steel is shown in Table 1 below. The furnace temperature is 1350°C. The amount of lime, high-magnesium lime and acidic composite slag added and the amount of oxygen blowing are listed in Table 2 below. Thus, the tapping composition of the X65 steel grade steel obtained by smelting is shown in Table 1 below, and the tapping temperature is 1690°C. Among them, the slag basicity is 3.6, the slagging coefficient is 0.86, the dephosphorization efficiency is 0.89, the weight percent content of MgO in the slag is 10%, the content of MgO in the high magnesium lime is 30% by weight, and the content of CaO in the high magnesium lime is The content of CaO in lime is 52% by weight, the content of CaO in lime is 88% by weight, and the content of SiO in acidic compo...

Embodiment 2

[0063] This embodiment is used to illustrate the semi-steel steelmaking method provided by the present invention.

[0064] Put 120 tons of vanadium-extracted semi-steel into the converter for smelting. The composition of the semi-steel is shown in Table 3 below. The furnace temperature is 1343°C. ) and the amount of oxygen blowing are shown in Table 4 below, so that the tapping composition of the steel of YQ450 steel grade obtained by smelting is shown in Table 3 below, and the tapping temperature is 1698°C. Among them, the slag basicity is 4.2, the slagging coefficient is 0.98, the dephosphorization efficiency is 0.92, the weight percentage of MgO in the slag is 11.2%, the content of MgO in the high magnesium lime is 36% by weight, and the content of CaO in the high magnesium lime is 49% by weight, the content of CaO in lime is 90% by weight, and the content of SiO in acidic composite slag 2 The content is 45% by weight, semi-steel oxidized SiO 2 It is 0.039% of the weight ...

Embodiment 3

[0071] This embodiment is used to illustrate the semi-steel steelmaking method provided by the present invention.

[0072] Add 120 tons of vanadium-extracted semi-steel into the converter for smelting. The composition of the semi-steel is shown in Table 5 below. The furnace temperature is 1333°C. The amount of addition and the amount of oxygen blowing are shown in Table 6 below, so that the tapping composition of the steel that is smelted to obtain the Q235D steel grade is shown in Table 5 below, and the tapping temperature is 1692 °C . Among them, the slag basicity is 4.7, the slagging coefficient is 0.79, the dephosphorization efficiency is 0.94, the weight percent content of MgO in the slag is 12%, the content of MgO in the high-magnesia lime is 40% by weight, and the content of CaO in the high-magnesia lime The content of CaO in lime is 55% by weight, the content of CaO in lime is 85% by weight, and the content of SiO in acidic composite slag 2 The content is 51% by weig...

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Abstract

The invention discloses a semi-steel steelmaking method, wherein the method comprises the steps of: adding raw materials into a steel making furnace, blowing oxygen into the furnace to obtain molten steel and slag; the raw materials comprises raw steel, lime, high-magnesium lime and acid composite slag; the raw steel contains semi-steel after vanadium extraction; the addition of the acid composite slag meets the following formula: W (acid composite slag) is equal to (( (CaO (lime) plus CaO (high-magnesium lime) minus SiO2 (oxidized semi-steel) multiplied by R) divided by R ) divided by SiO2% (acid composite slag) ) multiplied by K, wherein W acid composite slag refers to the addition of the acid composite slag, CaO lime refers to the quantity of CaO brought in by the lime, CaO high-magnesium lime refers to quantity of CaO brought in by the high-magnesium lime, SiO2 oxidized semi-steel refers to the quantity of SiO2 converted from the quantity of Si element in the semi-steel, R refers to the alkalinity of slag, and ranges from 3 to 5, SiO2% acid composite slag refers to the weight percentage of SiO2 in the acid composite slag, and K refers to a fluctuation coefficient with a value ranging from 0.98 to 1.02. The semi-steel steelmaking method can achieve good dephophorization and desulfurization and is applicable to the automation production.

Description

technical field [0001] The invention relates to a semi-steel steelmaking method. Background technique [0002] Semi-steel steelmaking is characterized by high temperature, fast and complex reaction, short smelting time, and many influencing factors. Therefore, semi-steel steelmaking system is a large system with multiphase, multivariable and complex reactions. In the semi-steel steelmaking method of the prior art, the amount of raw materials added to the steelmaking system is controlled by manual experience. However, due to the different qualities of technicians and operators, the working conditions are very complicated, and the detection methods are limited, which makes it difficult to achieve standardization and standardization of manual control. With the increase of smelting steel types and the improvement of the quality requirements of molten steel, coupled with the variety of steelmaking raw materials and large fluctuations in composition, the capacity of steelmaking f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/54C21C5/04C21C7/076C21C5/00
CPCY02P10/20
Inventor 梁新腾陈永李安林戈文荪何为肖明富李桂军杨森祥李清春蒋龙奎杨辉合
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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