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Smelting technique for removing Sb under arc furnace conditions

A technology for electric arc furnaces and conditions, applied in electric furnaces, improvement of process efficiency, furnaces, etc.

Active Publication Date: 2014-03-19
YANTAI TAIHAI MANOIR NUCLEAR EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional smelting methods cannot effectively reduce Sb content

Method used

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  • Smelting technique for removing Sb under arc furnace conditions
  • Smelting technique for removing Sb under arc furnace conditions

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Embodiment Construction

[0023] Below in conjunction with embodiment further illustrate the present invention.

[0024] A smelting process for removing Sb under electric arc furnace conditions is characterized in that it comprises the following steps:

[0025] (1) Charging: Lime and fluorite used as slag material in the bottom of the electric arc furnace, the weight ratio is lime: fluorite = 4:1, the total weight of lime and fluorite accounts for 4%-5% of the total molten steel;

[0026] (2) Melting period: Strictly control the operation and power supply system during the melting period to prevent local overheating of molten steel. The melting temperature is not higher than 1550°C;

[0027] (3) Oxidation period: decarburization rate ≤0.03% / min; oxidation period temperature 1550°C~1680°C, to ensure continuous temperature rise. When the temperature is around 1560°C and 1640°C, the oxygen blowing slag flow should be carried out once respectively, the outlet pressure of the oxygen blowing pipe is 0.2~0....

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Abstract

The invention relates to a smelting technique for removing Sb under arc furnace conditions. The temperature in the melting period is lower than or equal to 1550 DEG C; in the oxidation period, the decarburization speed is less than or equal to 0.03% / min, the temperature is 1550-1680 DEG C, and oxygen blast slag running is carried out once respectively at 1560 DEG C and 1640 DEG C; in the early reduction period, aluminum ingots, accounting for 3-4 wt% of the total molten steel, are added under the condition of clean surface or thin slag; after 5-10 minutes, a mixture of silico-calcium powder and carbon powder, accounting for 1-1.5 wt% of the total molten steel, is added, and the temperature in the reduction period is 1680-1600 DEG C; and before tapping, aluminum ingots, accounting for 0.08-0.1 wt% of the total molten steel, are added into the ladle. The success of testing under arc furnace conditions determines the process route of removing Sb under arc furnace conditions, and acquires satisfactory Sb removal effects.

Description

technical field [0001] The invention is a smelting process for removing antimony (Sb) under the condition of an electric arc furnace. Background technique [0002] Sb is an insoluble element in steel, with a white luster, firm and brittle, with a melting point of 603°C and a boiling point of 1440°C, which will have a very adverse effect on the thermoplasticity, corrosion resistance and oxidation resistance of steel. According to related data reports, when the average antimony content in steel is 0.001%, the antimony content on the grain boundary can reach 0.5%, and the enrichment ratio can reach 500. The segregation of antimony at the grain boundary can easily lead to grain boundary embrittlement and reduce the use of steel. life. Sb will produce surface enrichment and grain boundary oxidation during ingot forging heating, resulting in high temperature brittleness, forging surface cracks, and scrapping of forgings. [0003] On the other hand, Sb is easy to accumulate in s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 刘仲礼徐志强武明王桂权
Owner YANTAI TAIHAI MANOIR NUCLEAR EQUIP CO LTD
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