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High-efficiency oxygen supply method of 120 t converters

An oxygen supply and high-efficiency technology, applied in the manufacture of converters, etc., can solve the problems of poor slag melting effect, low slag content, and affecting the deep dephosphorization effect of slag, so as to achieve the effect of soft blowing and guaranteed dephosphorization effect

Inactive Publication Date: 2013-01-16
INNER MONGOLIA BAOTOU STEEL UNION
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AI Technical Summary

Problems solved by technology

After the transformation, if the previous five-hole oxygen lance is used again, the oxygen lance has a stronger penetrating power to the molten steel, which may easily cause low (FeO) content in the slag, poor slag removal effect, and affect the deep dephosphorization effect of the slag

Method used

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  • High-efficiency oxygen supply method of 120 t converters

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Embodiment approach 1

[0008] The raw material conditions are: 95.3t molten iron + 16.9t scrap iron and steel material. The composition of the molten iron is shown in Table 2.

[0009] Table 2 Composition of molten iron, w%

[0010] C

Si

mn

P

S

4.4

0.69

0.31

0.094

0.049

[0011] The operation to be taken is: in different stages of smelting, the operation mode of constant pressure variable lance (meaning that the height of the oxygen lance from the surface of the molten pool is changing) is adopted. The Mach number of the gas flow through the oxygen lance is 2.1, the pressure value used is 0.93Mpa, and the oxygen flow rate is 22000m 3 / h.

[0012] Initial stage of smelting: the height range between oxygen lance and molten pool is 1.9m;

[0013] Middle stage of smelting: the height range between oxygen lance and molten pool is 1.4m;

[0014] The height range between the oxygen lance and the molten pool at the end of smelting is...

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Abstract

The invention relates to a high-efficiency oxygen supply method of 120 t converters, wherein an oxygen lance is a six-hole oxygen lance; the diameter of the throat of the oxygen lance is 26.47 mm; the diameter of the outlet of the oxygen lance is 34.68 mm; the aperture angle of the oxygen lance is 12.5 degrees; the mach number of air flows passing through the oxygen lance during an oxygen supply process is 2.0-2.1; the pressure is 0.91-0.98 Mpa; the oxygen flow is 19000-22000 cu.m. / h; and the height range of the oxygen lance and a furnace hearth is 1.2-2.0 m. The oxygen supply method has the following advantages: compared with a five-hole oxygen lance, the six-hole oxygen lance blows more flexibly; the content of FeO in slag during a smelting process so as to ensure dephophorization effects; the method supplies oxygen by using the six-hole oxygen lance and shortens the total oxygen supply time of the oxygen lance by 1.7 min on average by setting reasonable oxygen supply parameters; the total oxygen consumption for each furnace of steels by 425 cu.m. on average.

Description

technical field [0001] The invention relates to a high-efficiency oxygen supply method for a 120t converter, which belongs to the field of steelmaking produced in the metallurgical industry. Background technique [0002] Baotou Steel's original converter is a 100t converter, and a five-hole oxygen lance is used to supply oxygen to the converter. Baotou Steel has carried out expansion and transformation on the original 100t converter, and the steel output has been transformed from the original 100t to 120t. The furnace wall is made of more high-quality refractory materials, so the furnace diameter is larger. The liquid level is shallower than before. The characteristics of the new 120t converter are: the inner diameter of the molten pool is 4350mm, and the depth of the molten pool is 1285mm. After the transformation, if the previous five-hole oxygen lance is used again, the oxygen lance has a stronger penetrating power to the molten steel, which may easily cause low (FeO) c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
Inventor 陈爱梅李峰
Owner INNER MONGOLIA BAOTOU STEEL UNION
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