Smelting method for steelmaking by increasing vanadium through vanadium slag

A smelting method and a vanadium slag technology, applied in the field of metallurgy, can solve the problems of large influence of ladle refractories, high oxide content, and difficulty in guaranteeing the yield of vanadium, and achieve the effect of cost reduction

Active Publication Date: 2021-07-16
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The cost of the above two vanadium-increased steelmaking processes is high, so researchers try to use vanadium slag instead of ferro-vanadium alloy to add to the steel, but because the vanadium slag contains a lot of oxides, after adding it to the steel, the temperature drop is large, and the vanadium The yield is difficult to guarantee, and at the same time, the vanadium slag has a great impact on the refractory material of the ladle, resulting in the replacement of vanadium-iron alloy by vanadium slag, which cannot form a stable process and add it to the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After blowing in a 120t converter until the final composition is tapped, 390kg of ferrosilicon (FeSi75), 2315kg of silicomanganese (Mn68Si18), and 322kg of high-carbon ferromanganese (FeMn78C8.0) are added to the ladle. Lift the ladle to the LF furnace, add 452kg of lime and 147kg of fluorite, and raise the temperature to 1660°C. Sampling, the composition results are: C: 0.21%, Si: 0.45%, Mn: 1.35%, P: 0.03%, S: 0.018%, V: 0.004%; use nitrogen for bottom blowing and stirring, bottom blowing pressure 0.35MPa, add Vanadium slag 463kg, composition of vanadium slag is 14.3% vanadium oxide, 7.5% titanium oxide, 5.9% calcium oxide, 18.6% silicon oxide, 7.5% manganese oxide, 2.1% magnesium oxide, 1.2% aluminum oxide; after 5 minutes of bottom blowing, measure the temperature 1575°C. Hoist to the slag removal station for slag removal treatment, and the thickness of the slag is controlled below 100mm. Afterwards, it was hoisted back to the LF furnace, and the temperature was m...

Embodiment 2

[0035] After tapping from the 120t converter, add 378kg of ferrosilicon (FeSi75), 2320kg of silicomanganese (Mn68Si18), and 327kg of high-carbon ferromanganese (FeMn78C8.0) into the ladle. Lift the ladle to the LF furnace, add 460kg of lime and 152kg of fluorite, and raise the temperature to 1658°C. Sampling, the composition results are: C: 0.22%, Si: 0.44%, Mn: 1.36%, P: 0.025%, S: 0.02%, V: 0.002%. Nitrogen is used for bottom blowing and stirring, the bottom blowing pressure is 0.35MPa, and 459kg of vanadium slag is added. The composition of vanadium slag is 14.5% of vanadium oxide, 7.6% of titanium oxide, 5.6% of calcium oxide, 18.3% of silicon oxide, 7.2% of manganese oxide, and 2.2% of magnesium oxide. %, alumina 1.1%; after bottom blowing for 5 minutes, the temperature was measured at 1571°C. Hoist to the slag removal station for slag removal treatment, and the thickness of the slag is controlled below 100mm. Lift it back to the LF furnace, and measure the temperature ...

Embodiment 3

[0037]After tapping from the 120t converter, add 473kg of aluminum particles (Al), 678kg of carbon powder (C), and 1028kg of high-carbon ferromanganese (FeMn78C8.0) into the ladle. Lift the ladle to the LF furnace, add 496kg of lime, 155kg of fluorite, 98kg of aluminum particles (Al), and raise the temperature to 1665°C. Sampling, composition results are: C: 0.33%, Si: 0.18%, Mn: 0.65%, P: 0.015%, S: 0.002%, V: 0.002%, Cr: 0.04%, Ni: 0.01%, Cu: 0.01% . Nitrogen is used for bottom blowing and stirring, the bottom blowing pressure is 0.33MPa, and 895kg of vanadium slag is added. The composition of vanadium slag is 15.1% of vanadium oxide, 7.3% of titanium oxide, 5.7% of calcium oxide, 18.4% of silicon oxide, 7.2% of manganese oxide, and 2.2% of magnesium oxide. %, alumina 1.2%; after bottom blowing for 5 minutes, the temperature was measured at 1535°C. The temperature was raised to 1588°C. Hoist to the slag removal station for slag removal treatment, and the thickness of the ...

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Abstract

The invention discloses a smelting method for steelmaking by increasing vanadium through vanadium slag. The smelting method comprises the following steps of converter tapping deoxidation, LF furnace heating, vanadium slag adding and alloy alloying, vanadium slag recycling, LF refining furnace treatment and continuous casting. Vanadium-increasing steelmaking is conducted through the method, the vanadium slag can be recycled to a large extent, 500-1500 kg of vanadium slag can be utilized in each furnace, and the vanadium yield reaches 65-80%. In the vanadium-increasing steelmaking process, the erosion influence of the vanadium slag on a furnace lining is small, and the ladle age of a steel ladle is the same as that of a steel ladle for increasing vanadium through ferrovanadium. In addition, compared with a traditional method, the method has the advantage that the cost of vanadium-increasing steelmaking is reduced by 10-30 yuan per ton of steel, and the method is worthy of application and popularization.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a smelting method for making steel by adding vanadium to vanadium slag. Background technique [0002] Vanadium is known as "the monosodium glutamate of modern industry" and is an important national strategic material. As an alloy additive, vanadium can significantly improve the strength, toughness, ductility, and plasticity of steel. The carbides and nitrides formed by vanadium in steel have the functions of refining grains, eliminating inclusions and enhancing ductility. [0003] In the process of steelmaking, the content of vanadium in steel is usually increased by adding ferrovanadium alloy. The advantage of this steelmaking method is that the yield of vanadium is high, the yield is stable, and the operation is simple and easy, but the cost is relatively high. Another method is to increase the content of vanadium in steel by adding vanadium extracted from vanad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C22C33/04
CPCC21C7/0006C21C7/06C22C33/04C22C33/006Y02P10/20
Inventor 张成勇张继斌黄兴凯速国武陆大章
Owner WUKUN STEEL
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