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Method for application of limestone instead of calcium carbide to LF refining

A limestone and calcium carbide technology, applied in the field of metallurgy, can solve the problems of affecting the use effect, increasing the production cost, increasing the labor intensity of the field operators, and achieving the effect of remarkable effect and reducing consumption.

Active Publication Date: 2019-02-15
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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  • Method for application of limestone instead of calcium carbide to LF refining
  • Method for application of limestone instead of calcium carbide to LF refining
  • Method for application of limestone instead of calcium carbide 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 application of limestone instead of calcium carbide to LF refining. The method comprises the following steps that in the LF refining process, after molten steel enters a station and a steel ladle enters a working station, bottom blowing argon is connected and opened, 3.0 to 5.0 kg of lime and 2.0 to 3.0 kg of limestone are added into per ton of steel, meanwhile, according to different steel types, 0 to 0.7 kg of aluminum granules, 0 to 0.8 kg of silicone-calcium powder and 0 to 1.0 kg of a ferrosilicon powder deoxidizing agent are added into per ton of steel, after stirring is conducted for 3 to 5 min, the flow of the argon is adjusted, and then electrodes are lowered for heating; and the limestone is heated and decomposed to generate CaO and CO2, wherein the CaO serves as a slagging material to enter slag, the steel slag is filled with the CO2, thus the foaming effect is achieved, and the effect of submerged arc operation is achieved. According tothe method, by using the cheap limestone instead of the expensive calcium carbide to serve as a foaming agent, the expected submerged arc effect is achieved, the refining production cost is lowered obviously, and the labor intensity of workers is lowered.

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 Applications(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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