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A kind of method that limestone replaces calcium carbide and is applied to lf refining

A technology of limestone and calcium carbide, which is applied in the field of metallurgy, can solve problems such as affecting the use effect, increasing production costs, and increasing the labor intensity of on-site operators, and achieves the effect of reducing consumption and achieving remarkable results

Active Publication Date: 2021-07-20
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During transportation and storage, calcium carbide is easy to react with moisture in the air and decompose, which not only affects its use effect but also generates toxic gas CO. At the same time, calcium carbide is packaged in bags, which requires operators to add it manually, which increases the labor of on-site operators. strength, which increases production costs

Method used

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  • A kind of method that limestone replaces calcium carbide and is applied to lf refining
  • A kind of method that limestone replaces calcium carbide and is applied to lf refining
  • A kind of method that limestone replaces calcium carbide and is applied to lf refining

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] In this example, a method of applying limestone instead of calcium carbide to LF refining is used in the LF refining process of cold heading steel SWRCH22A. The weight of molten steel is 109t, and the temperature of molten steel entering the station is 1540°C. After the ladle enters the working position, connect and open the bottom Blow argon to adjust the argon flow rate to 200Nm³ / h, add lime 5.0kg / t steel, limestone 2.5kg / t steel, and add 0.7kg / t steel aluminum particles, 0kg / t steel calcium calcium powder, 0kg / t Iron silicon powder deoxidizer for steel, after stirring for 3 minutes, adjust the argon flow rate to 100Nm³ / h; then lower the electrode to heat, the initial heating time is 9 minutes, and the temperature of molten steel after heating is 1550°C. After the initial heating, take a refined slag sample for inspection, and the inspection results are as follows : CaO: 47.44%, SiO 2 : 16.25%, MgO: 10.41%, Al 2 o 3 : 19.81%, FeO: 1.2%, MnO: 1.4%; in the whole proce...

Embodiment 2

[0029] In this example, a method of applying limestone to LF refining instead of calcium carbide is used in the LF refining process of cold heading steel SWRCH22A. The weight of molten steel is 108t, and the temperature of molten steel entering the station is 1538°C. After the ladle enters the working position, connect and open the bottom Blow argon to adjust the argon flow rate to 250Nm³ / h, add lime 4.5kg / t steel, limestone 2.5kg / t steel, and add 0.6kg / t steel aluminum particles, 0kg / t steel calcium calcium powder, 0kg / t For ferrosilicon powder deoxidizer for steel, after stirring for 3 minutes, adjust the argon flow to 50Nm³ / h; then lower the electrode for heating, the initial heating time is 9 minutes, and the temperature of molten steel after heating is 1549°C. After the initial heating, take a refined slag sample for inspection, and the inspection results are as follows : CaO: 46.95%, SiO 2 : 16.48%, MgO: 10.52%, Al 2 o 3 : 19.23%, FeO: 1.3%, MnO: 1.6%; in the whole pro...

Embodiment 3

[0031] In this example, a method of applying limestone instead of calcium carbide to LF refining is used in the LF furnace refining process of rebar HRB400E. The weight of molten steel is 110t, and the temperature of molten steel entering the station is 1500°C. After the ladle enters the working position, connect and open the bottom blower Adjust the argon flow rate to 150Nm³ / h with argon gas, add lime 3.0kg / t steel, limestone 2.0kg / t steel, add 0kg / t steel aluminum particles, 0.5kg / t steel calcium calcium powder, 1.0kg / t For ferrosilicon powder deoxidizer for steel, adjust the argon flow to 80Nm³ / h after stirring for 3 minutes; then lower the electrode to heat, the initial heating time is 7 minutes, and the temperature of molten steel after heating is 1510°C. After the initial heating, take a refined slag sample for inspection, and the inspection results are as follows : CaO: 43.27%, SiO 2 : 28.51%, MgO: 12.7%, Al 2 o 3 : 6.52%, FeO: 1.43%, MnO: 2.42%; in the whole process ...

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Abstract

The invention discloses a method for applying limestone instead of calcium carbide to LF refining. In the LF refining process, molten steel enters the station, and the ladle enters the working position, and the bottom blowing argon gas is connected and opened, and 3.0-5.0 kg of lime is added. / t steel, limestone 2.0‑3.0kg / t steel, at the same time, according to different steel types, add 0‑0.7kg / t steel aluminum particles, 0‑0.8kg / t steel calcium calcium powder, 0‑1.0kg / t Steel ferrosilicon powder deoxidizer, adjust the argon flow after stirring for 3-5 minutes, and then heat the lower electrode. Limestone is heated and decomposed to form CaO and CO 2 , where CaO enters the slag as a slagging material, CO 2 It is filled in steel slag to play the role of foaming and achieve the effect of submerged arc operation. The present invention uses cheap limestone instead of expensive calcium carbide as a foaming agent, thereby achieving the expected submerged arc effect, significantly reducing refining production costs, and reducing labor intensity of workers.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for applying limestone to LF refining instead of calcium carbide. Background technique [0002] In the production process of iron and steel enterprises, reducing production costs has always been the unremitting pursuit of enterprises. [0003] The chemical reactions in steelmaking mainly occur at the steel-slag interface. In the refining process of LF furnace, making good foam slag can increase the contact surface of reaction, which has obvious effects on improving the quality of molten steel, reducing the [N] content of molten steel, and improving the submerged arc effect. [0004] Calcium carbide is a foaming agent commonly used in the refining process of LF furnace. The main component of calcium carbide is CaC 2 . During transportation and storage, calcium carbide is easy to react with moisture in the air and decompose, which not only affects its use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076C21C7/06
CPCC21C7/06C21C7/076Y02P10/20
Inventor 李亚厚康毅靳刚强连庆房超何晴高玲玲
Owner HEBEI IRON AND STEEL
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