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Converting process for converter low-silicon molten iron

A technology for molten iron and converter, which is applied in the direction of manufacturing converters and improving process efficiency, and can solve the problems of excessive alkalinity of slag, difficult utilization of converter slag, and poor dephosphorization effect.

Active Publication Date: 2008-02-06
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the single slag method for blowing, they failed to solve the slag problem of low-silicon molten iron steelmaking well, and thought that the slag alkalinity is too high and the dephosphorization effect is not good, and the converter slag is difficult to use and no successful experience has been obtained.

Method used

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  • Converting process for converter low-silicon molten iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Hot metal conditions: [C] 4.6%, [Si] 0.30%, [Mn] 0.45%, [P] 0.12%, [S] 0.020%, hot metal temperature 1345°C.

[0082] (2) The oxygen lance nozzle adopts the oxygen lance nozzle shown in Figures 1-2 of the present invention.

[0083] (3) Converter top blowing oxygen flow rate 900Nm 3 / min.

[0084] (4) Oxygen lance position control: 2.3m in the initial stage, 2.8m in the middle stage, and 1.8m in the later stage.

[0085] (5) The charge alkalinity is 4.5, and the amount of slag-making material added per ton of steel: 28kg of lime, 15kg of light burned dolomite, and 10kg of iron ore. The first batch of slagging materials accounted for 60% of the total amount added, and the rest were added in 3 batches. The weight percentage of synthetic slag is: Fe 2 O 3 And FeO: 60%, CaO: 12%, MgO: 6.5%, Al 2 O 3 ≤5.0%, SiO 2 ≤8.0%, S≤0.05%, P≤0.05%, H 2 O≤0.5%, the rest is Fe and unavoidable impurities.

[0086] (6) When the oxygen blowing volume reaches 90% of the total oxygen blowing ...

Embodiment 2

[0090] (1) Hot metal conditions: [C] 4.3%, [Si] 0.22%, [Mn] 0.30%, [P] 0.08%, [S] 0.010%, molten iron temperature 1330°C.

[0091] (2) The oxygen lance nozzle adopts the oxygen lance nozzle shown in Figures 1-2 of the present invention.

[0092] (3) Oxygen flow rate 950Nm 3 / min.

[0093] (4) Oxygen lance position control: 2.5m in the initial stage, 3.0m in the middle stage, and 2.0m in the later stage.

[0094] (5) Charge alkalinity 5.8, adding amount of slagging material per ton of steel: lime 24kg, light burned dolomite 20kg, iron ore 7kg, heating agent 4kg, synthetic slag 3kg. The first batch of slagging materials accounted for 70% of the total amount added, and the rest were added in 3 batches. The weight percentage of synthetic slag is: Fe 2 O 3 And FeO: 55%, CaO: 15%, MgO: 8%, Al 2 O 3 ≤5.0%, SiO 2 ≤8.0%, S≤0.05%, P≤0.05%, H 2 O≤0.5%, the rest is Fe and unavoidable impurities.

[0095] (6) When the oxygen blowing volume reaches 90% of the total oxygen blowing volume, it is me...

Embodiment 3

[0099] (1) Hot metal conditions: C 4.1%, Si 0.10%, Mn 0.20%, P 0.01%, S 0.002%, hot metal temperature 1280°C.

[0100] (2) The oxygen lance nozzle adopts the oxygen lance nozzle shown in Figures 1-2 of the present invention.

[0101] (3) Oxygen flow rate 1050Nm 3 / min.

[0102] (4) Oxygen lance position control: 2.7m in the initial stage, 3.0m in the middle stage, and 1.9m in the later stage.

[0103] (5) Charge alkalinity 5.8, adding amount of slagging material per ton of steel: lime 18kg, light burned dolomite 25kg, iron ore 5kg, heating agent 7kg, synthetic slag 6kg. The first batch of slagging materials accounted for 60% of the total amount added, and the rest were added in 2 batches. The weight percentage of synthetic slag is: Fe 2 O 3 And FeO: 65%, CaO: 8%, MgO: 5%, Al 2 O 3 ≤5.0%, SiO 2 ≤8.0%, S≤0.05%, P≤0.05%, H 2 O≤0.5%, the rest is Fe and unavoidable impurities.

[0104] (6) When the oxygen blowing volume reaches 90% of the total oxygen blowing volume, measured with a su...

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Abstract

The present invention provides a siliconeisen iron melt blowing and refining method in a converter, and the method includes the steps as follows: (1) waste steel and iron melt are loaded into the converter, and oxygen blowing and steel making begin, the oxygen flux is 900Nm3 / min to 1050Nm3 / min, the height that the oxygen gun spraying head departs the metal liquid surface in the melt pond is 1.8-3.0m; (2) a first batch of slag charge is added after oxygen is blown in the first batch of the slag charge is 60-80 percent of the total slag charge, and the rest slag charge can be charged in 2-3 batches after the first batch of the slag charge is melted. The consumption of the slag charge: the lime 18-28kg / t steel, the light calcined dolomite 15-25kg / t steel, the ironstone 5-10kg / t steel, the carbonaceous heat generating agent 0-7kg / t steel, the compound slag 0-6kg / t steel; and the rest process are same as the prior art. The oxygen blowing duration of the present invention decreases 1.8min per furnace averagely, and the problem that the heat quantity is short and the slag forming is difficult can be solved simultaneously, and the present invention can make the converter steel-making to produce efficiently.

Description

Technical field [0001] The invention belongs to the field of oxygen converter steelmaking, and is mainly used for high-efficiency blowing of low-silicon molten iron in large and medium-sized converters. Background technique [0002] The traditional converter steelmaking process generally includes the following steps: main raw material calculation-converter charging scrap-converter charging molten iron-oxygen lance drop oxygen blowing-converter slagging material slagging-sub-lance blowing determination-converter stop blowing-auxiliary Gun temperature measurement sampling-tapping and blowing. [0003] The specific process parameters are controlled as follows: [0004] Calculation of main raw materials: first calculate the amount of scrap and molten iron required by the converter based on the converter’s furnace output, the yield of molten steel and the ratio of molten iron. [0005] Converter loading scrap steel-converter loading molten iron-oxygen lance down blowing oxygen: [000...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/35C21C5/36C21C1/02C21C5/46
CPCY02P10/20
Inventor 蒋晓放杨文远郁祖达吴文东王英均王明林曹德鞍掌佩静张敏
Owner BAOSHAN IRON & STEEL CO LTD
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