A method of controlling ladle slag by blowing argon gas around the taphole at the bottom of the ladle

A technology of tapping hole and bottom ring, which is applied in the direction of manufacturing tools, casting molten material containers, metal processing equipment, etc., can solve the problems of floating valve consumables, high price, and difficulty in adding drainage sand, so as to prevent slag from entering the tundish , the effect of increasing the yield

Active Publication Date: 2017-10-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main problems in this method: (1) During the pouring process of the ladle, as the liquid level of the ladle drops, the surface of the slag layer of the ladle begins to solidify and crust. device; (2) the floating valve is a consumable and expensive
The main defect of this method is that it will bring difficulties to the addition of drainage sand in the ladle, which will affect the self-opening rate of the ladle.

Method used

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  • A method of controlling ladle slag by blowing argon gas around the taphole at the bottom of the ladle
  • A method of controlling ladle slag by blowing argon gas around the taphole at the bottom of the ladle

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Effect test

Embodiment 1

[0019] The ladle that adopts in the present embodiment is 50 tons.

[0020] During the pouring process of the ladle, when the liquid level of the molten steel in the ladle is 150mm, the argon blowing pressure is controlled to be 0.2MPa, and the argon blowing flow rate is 1Nm 3 / h, so that argon gas is blown into the molten steel through the ring-shaped breathable brick. The breathable width of the ring-shaped breathable brick is 50mm, which can suppress the slag from the ladle and increase the yield of molten steel in the ladle pouring process.

[0021] Using the above process parameters, compared with the traditional ladle leaving steel operation to control the slag lowering process, the molten steel yield in the ladle pouring process is increased by 14%.

Embodiment 2

[0023] The ladle that present embodiment adopts is 80 tons.

[0024] During the pouring process of the ladle, when the liquid level of the molten steel in the ladle is 220mm, the argon blowing pressure is controlled to be 0.4MPa, and the argon blowing flow rate is 11Nm 3 / h, so that argon gas is blown into the molten steel through the annular air-permeable brick. The air-permeable width of the annular air-permeable brick is 150mm, which can suppress the slag from the ladle and increase the yield of molten steel during the ladle pouring process.

[0025] Using the above process parameters, compared with the traditional ladle leaving steel operation to control the slag lowering process, the molten steel yield in the ladle pouring process is increased by 15%.

Embodiment 3

[0027] The ladle that present embodiment adopts is 180 tons.

[0028] During the pouring process of the ladle, when the liquid level of the molten steel in the ladle is 400mm, the argon blowing pressure is controlled at 0.7MPa, and the argon blowing flow rate is 20Nm 3 / h, so that argon gas is blown into the molten steel through the annular air-permeable brick. The air-permeable width of the annular air-permeable brick is 300mm, which can suppress the slag of the ladle and increase the yield of molten steel during the ladle pouring process.

[0029] Using the above process parameters, compared with the traditional ladle leaving steel operation to control the slag lowering process, the molten steel yield in the ladle pouring process is increased by 17%.

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Abstract

The invention belongs to the field of continuous casting of iron and steel, and particularly relates to a method for controlling steel ladle tapping slag by blowing argon gas to an annular steel outlet in the bottom of a steel ladle. According to the method, annular purging plug bricks with the air permeability width of 50-300 mm are arranged around the steel outlet in the bottom of the steel ladle; in the steel ladle pouring process, when the height of a molten steel pouring liquid surface in the steel ladle is 150-400 mm, the argon gas blowing pressure is controlled to be 0.2-0.7MPa, so that the argon gas is blown into liquid steel through the annular purging plug bricks, and the steel ladle tapping slag is inhibited. The method can effectively inhibit the tapping slag caused due to conflux vortexes and drainage sunk pits in the steel ladle pouring process, and the yield of the liquid steel is further increased.

Description

technical field [0001] The invention belongs to the field of continuous casting of iron and steel, and in particular relates to a method for controlling slag in a ladle by blowing argon gas around a tap hole at the bottom of the ladle. Background technique [0002] In the continuous casting production process, when the slag containing iron oxide, manganese oxide and silicon oxide in the ladle flows into the tundish, it will cause burning loss of easily oxidized alloy elements such as aluminum and titanium in the molten steel, and produce alumina inclusions, affecting Cleanliness of molten steel, and easily cause steel surface quality problems. In addition, the inclusion of alumina in molten steel will also cause nozzle blockage, affecting the flow field in the crystallizer and the number of continuous casting furnaces in the tundish. Therefore, in order to improve the quality of the slab and increase the number of continuous casting furnaces, it is necessary to control the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/58
CPCB22D41/58
Inventor 郑淑国朱苗勇
Owner NORTHEASTERN UNIV LIAONING
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