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A method for increasing the manganese element of molten steel at the end point of converter

A converter end point and converter technology, which is applied in the field of iron and steel metallurgy and steelmaking, can solve the problems of lower smelting costs and greater influence of molten steel quality improvement, increased phosphorus return to molten steel at the end of the converter, and reduced alloy recovery rate in the tapping process. The dephosphorization efficiency in the early stage is beneficial to the maintenance of the furnace body and the effect of reducing the maintenance cost of the furnace body

Active Publication Date: 2022-04-29
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of increasing the temperature is firstly that it will increase the amount of phosphorus returned to the molten steel at the end of the converter, which will affect the dephosphorization effect; High temperature will increase the oxygen content in molten steel, increase the content of inclusions in molten steel, reduce the alloy recovery rate in the tapping process, and have a great impact on the reduction of smelting costs and the improvement of molten steel quality

Method used

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  • A method for increasing the manganese element of molten steel at the end point of converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1100

[0030] Example 1 End point control of 100-ton oxygen top-bottom combined blowing converter

[0031] A method for increasing the manganese element of molten steel at the end point of a converter, the method comprising the following steps:

[0032] 1) The silicon content of molten iron entering the converter is 0.50%, the manganese content is 0.20%, and the oxygen supply intensity is 3.0m 3 / t.min, before smelting, the end time of silicon and manganese oxidation period is calculated according to the content of silicon and manganese in molten iron, which is 3 minutes and 6 seconds; and the amount of lime added is calculated according to the basicity of slag 2.8 and the effective calcium oxide of lime at 80%. =2.14*2.8*0.50%*100 / 80%*1000=3745kg, the amount of sinter added is calculated as 24kg / t steel according to the heat balance.

[0033] 2) Add 2675kg of lime to the converter, add 1000kg to the first batch of dolomite, and the oxygen flow rate is 18000m 3 / h, gun position 150...

Embodiment 2250

[0038] Example 2 End point control of a 250-ton oxygen top-bottom double-blown converter

[0039] A method for increasing the manganese element of molten steel at the end point of a converter, the method comprising the following steps:

[0040] 1) The silicon content of the molten iron into the converter is 0.50%, the manganese content is 0.20%, and the oxygen supply intensity is 2.5m 3 / t.min, the end time of silicon and manganese oxidation period calculated according to the silicon and manganese content of molten iron before smelting is 3 minutes and 44 seconds; and according to the slag alkalinity of 2.8 and lime effective calcium oxide as 80%, the lime addition amount is calculated, Calculate the amount of sinter added according to the heat balance.

[0041] 2) Add 6687kg of lime to the converter, add 2500kg to the first batch of dolomite, and add oxygen flow rate of 37500m 3 / h, gun position 1800mm; smelting to 2 minutes and 47 seconds to add lime 1337kg, oxygen flow rat...

Embodiment 3

[0046] Example 3 End point control of a 100-ton oxygen top-bottom double-blown converter

[0047] A method for increasing the manganese element of molten steel at the end point of a converter, the method comprising the following steps:

[0048] 1) The silicon content of molten iron entering the converter is 0.50%, the manganese content is 0.20%, and the oxygen supply intensity is 3.0m 3 / t.min, before smelting, according to the silicon and manganese content of molten iron, the end time of the silicon and manganese oxidation period is calculated as 3 minutes and 6 seconds; and according to the slag alkalinity of 2.8, the effective calcium oxide of lime is 80%, and the lime addition amount is calculated. Calculate the amount of sinter added according to the heat balance.

[0049] 2) Add 2675kg of lime to the converter, add 1000kg to the first batch of dolomite, and the oxygen flow rate is 18000m 3 / h, gun position 1500mm; smelting to 2 minutes and 19 seconds to add lime 535kg,...

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Abstract

The invention relates to a method for improving the recovery rate of manganese element in molten steel at the end point of a converter, and belongs to the technical field of iron and steel metallurgy and steelmaking. Including: 1) Before smelting, determine the end time of silicon and manganese oxidation in the early stage of smelting according to the silicon and manganese content of the molten iron into the converter; Add 4 / 5 of the total limestone, add 1 / 2 of the remaining lime when smelting reaches 3 / 4 of the silicon and manganese oxidation end time, reduce the oxygen flow rate by 5% to 8%, and reduce the gun position by 50 to 200mm; 3 ) After the oxidation period of silicon and manganese, restore the oxygen flow rate and gun position to normal control, and add the remaining lime and all sintered ore; 4) Add the remaining dolomite 1 minute before the end of smelting, and lower the gun position by 150-400mm; 5 ) reaches the smelting end point to stop the oxygen supply. The invention can improve the oxidation atmosphere and slag composition in the furnace, increase the manganese element at the end point of the converter, and reduce the alloy cost.

Description

technical field [0001] The invention relates to a method for increasing the manganese element of molten steel at the end point of a converter, and belongs to the technical field of iron and steel metallurgy and steelmaking. Background technique [0002] Manganese is one of the indispensable elements in steel production. Manganese is the most important alloying element in steelmaking. Manganese in steel mainly improves the mechanical properties of steel and increases the strength, hardness, ductility and wear resistance of steel. wait. Converter smelting forms slag with a certain oxidation ability by supplying oxygen and adding a large amount of oxygen-containing materials to remove harmful elements such as carbon and phosphorus in molten iron. Cost reduction has a big impact. Effective use of manganese in molten iron can reduce the oxidation loss of manganese in the converter smelting process, reduce alloy consumption in the converter steelmaking process, reduce smelting c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/30C21C5/36
CPCC21C5/28C21C5/30C21C5/36
Inventor 任科社张昭平杨普庆
Owner SHANDONG IRON & STEEL CO LTD
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