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Production process for improving desulfurization efficiency of EAF-LF molten steel in refining process

An EAF-LF, refining process technology is applied in the field of production technology for improving desulfurization efficiency in molten steel refining process, can solve problems such as being difficult to achieve, and achieve the effects of short time consumption, simple production process, and fast desulfurization speed

Active Publication Date: 2020-12-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test found that before this process was used, the desulfurization time was 40 minutes, and it was difficult to achieve the goal of [S]≤25ppm

Method used

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  • Production process for improving desulfurization efficiency of EAF-LF molten steel in refining process
  • Production process for improving desulfurization efficiency of EAF-LF molten steel in refining process
  • Production process for improving desulfurization efficiency of EAF-LF molten steel in refining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] according to figure 2 The process operation; the details are as follows:

[0044] Adopt electric arc furnace to make steel, when the temperature reaches 1550-1600 degrees Celsius; tap 105 tons of steel, add 100Kg aluminum particles, 150Kg refining slag, 600Kg limestone to molten steel; Minutes later, enter the LF furnace, sample L1; then add 20Kg aluminum, 300Kg lime, 50Kg calcium carbide (calcium carbide), 150Kg refining slag and melt at 1550-1600 degrees Celsius for 10 minutes, sample L2, then add 10kg aluminum, 200Kg lime, Carbide 40kg, 50Kg refining slag, continue to smelt for 10 minutes, sample L3; then continue to add 100kg of lime, stir for 5 minutes, sample L4; after stirring, leave the station. The composition analysis of each sampling is shown in Table 2;

[0045] Table 2

[0046] C Si mn P Cu Ni Cr Mo v Nb Ti Al Ca S [O] E1 0.17 0.085 0.12 0.005 0.044 0.02 0.083 0.035 0 0.0004 0.0002 0.17 - 0.0262 185pp...

Embodiment 2

[0049] Others are consistent with embodiment 1, except that the composition of electric furnace tapping is slightly different; the composition of each sampling is shown in Table 3;

[0050] C Si mn P Cu Ni Cr Mo V Nb Ti Al Ca S [O] E1 0.16 0.085 0.12 0.005 0.040 0.04 0.085 0.034 0 0.0003 0.0002 0.16 - 0.0268 180ppm L1 0.26 0.28 0.39 0.0070 0.062 0.021 0.44 0.060 0.070 0.020 0.25 0.032 - 0.0146 L2 0.31 0.31 0.41 0.0075 0.055 0.020 0.45 0.080 0.080 0.020 0.26 0.033 - 0.0062 L3 0.33 0.32 0.43 0.0092 0.052 0.021 0.50 0.082 0.082 0.032 0.25 0.032 - 0.0029 L4 0.31 0.37 0.45 0.0088 0.058 0.022 0.515 0.081 0.072 0.031 0.26 0.040 - 0.002

[0051] .

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Abstract

The invention discloses a production process for improving desulfurization efficiency of EAF-LF molten steel in a refining process. According to the process, an ultra-low sulfur steel grade is produced by adopting an electric arc furnace end point carbon control process, an electric arc furnace oxygen-remaining tapping process, an out-of-furnace slagging process, an LF sectional desulfurization technology, an LF bottom argon blowing process and an alloy feeding process, the sulfur content in the molten steel can be rapidly reduced to an ideal value while the sulfur content of the molten steelis reduced, and only 25 minutes are consumed. The production process has the advantages that (1) the production process is simple, the consumed time is short, and the desulfurization speed is high; (2) excessive loss of molten steel temperature is reduced, and the purpose of reducing energy consumption can be achieved in the production process; (3) raw materials are added in sections, so that thedesulfurization effect can be greatly improved; and (4) the final sulfur content [S] of the molten steel can be controlled to be less than or equal to 25ppm.

Description

technical field [0001] The invention relates to the field of the refining process outside the electric arc furnace steelmaking furnace, in particular to a production process for improving the desulfurization efficiency of the molten steel refining process. Background technique [0002] With the increasingly serious environmental problems and the increasingly scarce resources and energy, the reuse of scrap steel has become the only way for the iron and steel smelting industry. More and more steel mills use electric arc furnaces to smelt scrap steel. Not only because electric arc furnaces can reduce environmental pollution, but also, electric arc furnace steelmaking can greatly reduce energy consumption and save smelting costs. At the same time, in order to meet people's requirements on the performance of steel products, desulfurization methods for electric arc furnace steelmaking have emerged one after another. [0003] The traditional electric arc furnace smelting is divide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/064C21C1/02C22C33/06C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
CPCC21C1/02C21C5/52C21C7/0006C21C7/064C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50Y02P10/20
Inventor 王万林张同生李人升戴诗凡彭建飞毛松黄道远
Owner CENT SOUTH UNIV
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