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Converting process for converter low-silicon molten iron

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

Active Publication Date: 2010-10-13
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
  • Converting process for converter low-silicon molten iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Molten iron conditions: [C] 4.6%, [Si] 0.30%, [Mn] 0.45%, [P] 0.12%, [S] 0.020%, molten iron temperature 1345 ℃.

[0082] (2) The oxygen lance spray head adopts the present invention's attached Figure 1-2 Oxygen lance nozzle shown.

[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 late stage.

[0085] (5) Fill in the alkalinity 4.5, the amount of slag-making materials per ton of steel: lime 28kg, lightly burned dolomite, iron ore 10kg. The first batch of slagging materials accounted for 60% of the total amount added, and the rest were added in 3 batches. The composition weight mesh ratio 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 amount of oxygen blowing reaches 90% of the total amou...

Embodiment 2

[0090] (1) Molten iron conditions: [C] 43%, [Si] 0.22%, [Mn] 0j0%, [P] 0.08%, [S] 0.010%, molten iron temperature 1330 ℃.

[0091] (2) the oxygen lance nozzle adopts the present invention's attached Figure 1-2 Oxygen lance nozzle shown.

[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 late stage.

[0094] (5) Loading alkalinity 5.8, adding amount of slagging material per ton of steel: 24kg of lime, 20kg of lightly burned dolomite, 7kg of iron ore, 4kg of exothermic agent, 3kg of synthetic slag. The first batch of slagging materials accounted for 70% of the total amount added, and the rest were added in 3 batches. The composition weight percent 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 amount of oxygen blowing reaches ...

Embodiment 3

[0099] (1) Conditions of molten iron: C4.1%, Si0.10%, Mn0.20%, P0.01%, S0.002%, molten iron temperature 1280°C.

[0100] (2) the oxygen lance nozzle adopts the present invention's attached Figure 1-2 Oxygen lance nozzle shown.

[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 late stage.

[0103] (5) Loading alkalinity 5.8, adding amount of slagging material per ton of steel: 18kg of lime, 25kg of lightly burned dolomite, 5kg of iron ore, 7kg of exothermic agent, 6kg of synthetic slag. The first batch of slagging material accounts for 60% of the total amount added, and the rest is added in two batches. The composition weight percent of synthetic slag is; Fe 2 o 3 And O: 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 amount of oxygen blowing reaches 90% of the t...

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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, thecarbonaceous 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 process of converter steelmaking generally includes the following steps: calculation of main raw materials, loading of scrap steel into converter, loading of molten iron into converter, oxygen blowing by lowering of oxygen lance, addition of slag material to converter, slag production, measurement of a pair of lance during blowing, stop of converter and blowing of a pair Gun temperature measurement sampling a steel blowing. [0003] Concrete process parameter control is as follows; [0004] Calculation of main raw materials: First, calculate the amount of steel scrap and molten iron required by the converter according to the furnace output of the converter, the yield of molten steel and the ratio of molten iron. [0005] The conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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