Converter dephosphorizing and steelmaking method

A converter and slag technology, applied in the manufacture of converters, etc., can solve the problems of serious phosphorus return in molten steel, terminal phosphorus control, and difficult control of slag volume, and achieve the effect of saving smelting costs

Inactive Publication Date: 2011-05-25
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has the following disadvantages: adding a deep dephosphorization agent to the ladle in advance has strict requirements on the control of the oxygen content of the molten steel. If the oxygen content of the tapping is too high, the ladle may be "shot" during the tapping process or after the tapping is completed. Phenomena, there are certain safety hazards; deep dephosphorizatio

Method used

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  • Converter dephosphorizing and steelmaking method
  • Converter dephosphorizing and steelmaking method
  • Converter dephosphorizing and steelmaking method

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Embodiment 1

[0041] In this embodiment, the nozzle parameters of the dephosphorization oxygen lance and the five-hole oxygen lance adopted by a certain steel plant are shown in Table 2.

[0042] Table 2 Nozzle parameters of dephosphorization oxygen lance and 5-hole oxygen lance

[0043]

[0044] The 120-ton converter in a steel plant adopts such as figure 1 and figure 2 When the shown dephosphorization oxygen lance is smelted, the oxygen flow rate is 16000Nm 3 / h, the working pressure is 0.7MPa, the oxygen supply intensity is 1.91m3 / (t steel min), and the first batch of slagging materials is added: active lime 10kg / t 半钢 ;The amount of high magnesium lime added is 10kg / t 半钢 ; The amount of compound slagging agent added is 22kg / t 半钢 ; In the later stage of dephosphorization, the amount of sludge ball added is 5.1kg / t 半钢 . The above-mentioned slag-making materials are gradually added in the first 4.5 minutes, and the slag is poured after 7 minutes of dephosphorization oxygen lance b...

Embodiment 2

[0049] In this embodiment, the nozzle parameters of the dephosphorization oxygen lance and the five-hole oxygen lance adopted by a certain steel plant are shown in Table 4.

[0050] Table 4 Nozzle parameters of dephosphorization oxygen lance and 5-hole oxygen lance

[0051]

[0052] When a 120-ton converter in a steel plant is smelted with a dephosphorization oxygen lance, the oxygen flow rate is 15000Nm 3 / h, the working pressure is 0.7MPa, the oxygen supply intensity is 1.96m 3 / t 钢 , the amount of the first batch of slagging material added: active lime 20kg / t 半钢 ;The amount of high magnesium lime added is 20kg / t 半钢 ; The amount of compound slagging agent added is 10kg / t 半钢 ; In the later stage of dephosphorization, the amount of composite slag added is 10kg / t 半钢 In the dephosphorization period, the auxiliary materials are gradually added in the first 4 minutes, and the dephosphorization oxygen lance is blown for 8 minutes and then the slag is poured out. After repl...

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Abstract

The invention provides a converter dephosphorizing and steelmaking method. The method comprises the following steps of: a, adding slag making materials which consist of active lime, high-magnesium lime and a composite slagging agent into a converter molten pool; blowing and slagging by a dephosphorizing oxygen lance oxygen blowing process and an inert gas bottom blowing process to remove phosphorus in molten steel; and pouring 60 to 80 percent of slag out when the molten pool temperature in a converter is between 1,420 and 1,450 DEG C, the alkalinity of the slag is between 2.0 and 2.5 and the total iron content in the slag is between 10 and 15 weight percent; and b, adding the slag making materials into the converter molten pool; blowing and slagging by a normal oxygen lance oxygen blowing process and the inert gas bottom blowing process to further remove the phosphorus in the molten steel; pouring the slag out when the molten pool temperature in the converter is between 1,680 and 1,700 DEG C, the alkalinity of the slag is between 3.2 and 4.2 and the total iron content in the slag is between 16 and 23 weight percent to obtain the molten steel with the phosphorus element content of not more than 0.009 weight percent. By the method, the dephosphorizing efficiency and the dephosphorizing effect of the converter are improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, and more specifically, relates to a converter dephosphorization steelmaking method. Background technique [0002] For enterprises using vanadium-titanium ore resources for smelting and production, in order to ensure the effective use of vanadium resources, it is necessary to extract vanadium and desulfurize before steelmaking. The molten steel obtained after vanadium-containing molten iron is desulfurized and vanadium-extracted is usually called semi-steel. In this semi-steel, the mass percentage of carbon is 3.4% to 4.0%, and the content of heat-generating slag-forming elements such as silicon and manganese is trace. And the mass percent content of sulfur in the semi-steel is controlled within 0.015%. However, due to no dephosphorization treatment, the mass percentage of phosphorus in the semi-steel is usually 0.060% to 0.080%, which leads to the conversion of the semi-steel after...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/064
Inventor 李利刚梁新腾杨森祥曾建华刘荣蒂陈均李清春黄登华陈怀杰冉瑞江
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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