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Method for improving steel ladle free-opening rate by bottom-blowing inert gas

A technology of inert gas and self-opening rate, which is used in casting melt containers, metal processing equipment, casting equipment, etc., can solve the problem that the ladle cannot be automatically opened and poured, so as to prevent the molten steel freezing layer from thickening, improve the self-opening rate, The effect of reducing the thickness of the crust

Active Publication Date: 2018-09-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the ladle cannot be opened automatically and the deficiencies of the prior art, the p

Method used

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  • Method for improving steel ladle free-opening rate by bottom-blowing inert gas

Examples

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Embodiment 1

[0025] A method of bottom blowing inert gas to improve the self-opening rate of the ladle, such as figure 1 with 2 Shown, the ladle that present embodiment adopts is 60 tons. Include the following steps:

[0026] Step 1: The ladle 3 is located at the standby position on the ladle turret 1 and is waiting to be transferred to the working position. When the last furnace ladle at the working position is being poured 5 minutes before the end of pouring, it will flow to the ladle 3 through the vent block 7 at the bottom of the ladle 3. The inner molten steel is fed with argon gas, among which: the pressure of the inert gas is 0.35MPa, and the flow rate is 10Nm 3 / h;

[0027] Step 2: Continuously blowing inert gas, so that the temperature of the molten steel within 30cm directly above the vent block 7 is increased by 3-5°C, and the temperature of the molten steel in the ladle is uniform, which effectively prevents the frozen layer of the molten steel on the upper part of the sinte...

Embodiment 2

[0030] A method of bottom blowing inert gas to improve the self-opening rate of the ladle, such as figure 1 with 2 Shown, the ladle that present embodiment adopts is 120 tons. Include the following steps:

[0031] Step 1: The ladle 3 is located at the standby position on the ladle turret 1 and is waiting to be transferred to the working position. When the last furnace ladle at the working position is being poured 7 minutes before the end of pouring, it will flow to the ladle 3 through the vent block 7 at the bottom of the ladle 3. The inner molten steel is fed with argon gas, among which: the pressure of the inert gas is 0.5MPa, and the flow rate is 30Nm 3 / h;

[0032] Step 2: Continuously blowing inert gas to increase the temperature of the molten steel within 30cm directly above the vent block 7 by 3-5°C, and to make the temperature of the molten steel in the ladle uniform, effectively preventing the frozen layer of the molten steel on the upper part of the sintered layer...

Embodiment 3

[0035] A method of bottom blowing inert gas to improve the self-opening rate of the ladle, such as figure 1 with 2 Shown, the ladle that present embodiment adopts is 180 tons. Include the following steps:

[0036] Step 1: The ladle 3 is located at the standby position on the ladle turret 1 and is waiting to be transferred to the working position. When the last furnace ladle at the working position is being poured 8 minutes before the end of pouring, it will flow to the ladle 3 through the vent block 7 at the bottom of the ladle 3. The inner molten steel is fed with argon gas, among which: the pressure of the inert gas is 0.65MPa, and the flow rate is 45Nm 3 / h;

[0037]Step 2: Continue to blow inert gas until the temperature of the molten steel within 30cm directly above the vent block 7 increases by 3-5°C, and the temperature of the molten steel in the ladle is uniform, effectively preventing the frozen layer of the molten steel on the upper part of the sintered layer of t...

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Abstract

The invention discloses a method for improving a steel ladle free-opening rate by bottom-blowing an inert gas, and belongs to the field of steel smelting technologies. The method comprises the following steps: 1) transferring a steel ladle positioned in a standby station on a steel ladle turret to a working station, while the steel ladle in a previous furnace which is positioned in the working station for casting is 5-8 min from the end of casting, feeding the inert gas to liquid steel in the steel ladle positioned in the standby station through a ventilation water gap seating brick at the bottom of the steel ladle, wherein a pressure of the fed inert gas is 0.35-0.65 MPa, and a flow rate is 10-45 Nm3/h; and 2) continuously blowing the inert gas, and enabling a temperature of the liquid steel which is within 30 cm above the ventilation water gap seating brick to be improved by 3-5 DEG C, wherein the temperature of the liquid steel in the steel ladle is uniform; and after the steel ladle is rotated to the working station, opening a sliding water gap, stopping feeding the inert gas, and starting the normal casting. The method is capable of effectively preventing a liquid steel frozenlayer at the upper part of a ladle filter sand sintered layer from being thickened, reducing a thickness of a crusting layer above the water gap, guaranteeing that the liquid steel can crush the crusting layer at the water gap so as to realize the automatic casting in a casting process, and improving the steel ladle free-opening rate.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for increasing the self-opening rate of a ladle by bottom blowing inert gas. Background technique [0002] The automatic pouring of the ladle means that the drainage sand will flow out from the nozzle automatically when the pouring is started, and the molten steel will naturally flow out from the nozzle after the sintered layer of the drainage sand is crushed by the static pressure, and the ladle starts to pour normally. However, in current industrial production, due to long-term refining and standing of molten steel, the drainage sand is excessively sintered under high temperature and high pressure, and cannot be poured normally, which greatly reduces production efficiency. At present, when iron and steel enterprises encounter this problem, they generally adopt the method of artificially burning oxygen to start pouring, that is, blowing away ...

Claims

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Application Information

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IPC IPC(8): B22D41/44
CPCB22D41/44
Inventor 郑淑国邹琦朱苗勇
Owner NORTHEASTERN UNIV