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Vertex angle combined blowing type aluminum melt degassing method and device

A technology of aluminum melt and jetting device, which is applied in the field of metal refining or remelting, can solve the problems of intensified fluctuation of the liquid level of aluminum melt, intensified hydrogen absorption of the melt, and high gas content in the central area of ​​the degassing box, and achieves improvement. The effect of gas distribution, reduction of liquid level fluctuation, and reduction of hydrogen absorption

Active Publication Date: 2012-08-08
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above two methods have certain advantages over the traditional rotary injection method, but they still have certain limitations on the dehydrogenation of the aluminum melt in the entire degassing box: the bubbles enter the aluminum from the nozzle hole of the rotary nozzle in the form of a jet. In the melt, the gas content in the central area of ​​the degassing box is high, while the content of purified gas in the corner area is very small, especially when the size of the degassing box is large, the gas medium cannot reach the corner area, so the corner area The aluminum melt in the area cannot fully contact with a sufficient number of air bubbles, resulting in poor degassing effect of the aluminum melt in the corner area of ​​the degassing box
In order to improve the gas distribution in the corner area, it is necessary to increase the rotational speed of the rotary nozzle, but this will lead to aggravated fluctuations in the liquid level of the aluminum melt, and the intensification of the hydrogen absorption of the melt, which is not conducive to the purification of the aluminum melt

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  • Vertex angle combined blowing type aluminum melt degassing method and device
  • Vertex angle combined blowing type aluminum melt degassing method and device
  • Vertex angle combined blowing type aluminum melt degassing method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Please see figure 1 , figure 1 It is a structural schematic diagram of the degassing box used in the method of degassing the aluminum melt by re-blowing at the top angle. The degassing box includes a degassing box body 1, and a rotary blowing device is arranged in the middle of the degassing box body 1. The rotary blowing device described above is driven by a rotary drive mechanism 9, and the rotary blowing device includes a rotary rod 3 and a rotary spray head 4. The rotating rod 3 is connected with the rotating drive mechanism 9 through threads, the upper end of the rotating rod 3 is provided with a top air inlet hole 7, and the lower end is connected with the rotating nozzle 4 through threads. The inert gas is introduced into the rotating rod 3 through the top inlet hole 7, and then injected into the aluminum melt through the peripheral gas injection holes on the rotating nozzle 4 while rotating. The air injection device provided at the four corners of the degassin...

Embodiment 2

[0033] Please see figure 1 Connect the top air inlet 7 in the degassing box body 1 and the far end of the peripheral air inlet 8 to the device for inert gas delivery, and the inert gas is blown from the top air inlet 7 through the rotating rod 3 and the rotating nozzle 4 Into the aluminum melt 2, while the inert gas is blown into the aluminum melt 2 in the corner area of ​​the degassing box from the peripheral air inlet 8 through the gas injection pipe 5 and the blowing hole 6. The rotor gas flow rate in the rotary nozzle 4 is 1.0-3.0m 3 / h, the rotation speed of the rotor is 100-200r / min, the ventilation volume of the air injection device at the four corners is 0.5-1.0m 3 / h, the treatment time is 15min, and the gas removal rate of aluminum liquid after treatment is 45-50%.

Embodiment 3

[0035] Please see figure 1 Connect the top air inlet 7 in the degassing box body 1 and the far end of the peripheral air inlet 8 to the device for inert gas delivery, and the inert gas is blown from the top air inlet 7 through the rotating rod 3 and the rotating nozzle 4 Into the aluminum melt 2, while the inert gas is blown into the aluminum melt 2 in the corner area of ​​the degassing box from the peripheral air inlet 8 through the gas injection pipe 5 and the blowing hole 6. The rotor gas flow rate in the rotary nozzle 4 is 3.0-5.0m 3 / h, the rotation speed of the rotor is 200-250r / min, the ventilation volume of the air injection device at the four corners is 1.0-2.0m 3 / h, the treatment time is 15min, and the gas removal rate of molten aluminum after treatment is 50-60%.

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Abstract

The invention relates to a vertex angle combined blowing type aluminum melt degassing method. The method comprises blowing inert gas into the aluminum melt through the gas inlet hole on top of a rotating jetting device, and simultaneously blowing the inert gas into the aluminum melt on the corner areas of a degassing box through the peripheral gas inlet holes in jetting devices at four corners ofthe degassing box, wherein rotating speed of the rotors in the rotating jetting device is 100-400r / min. The invention also provides a device adopted in the vertex angle combined blowing type aluminummelt degassing method. The device comprises a degassing box body, jetting devices are arranged at four corners of the degassing box, the jetting devices comprise jetting tubes, peripheral gas inlet holes are arranged at upper end of the jetting tubes, and a plurality of gas blowing holes are arranged on the tube bodies. The invention has the beneficial effects that vertex angle combined blowing mode is adopted to realize uniform distribution of gas bubbles in the whole melting pool, so that aluminum melt at central main body area and corner areas of the degassing box can be adequately contacted with enough gas bubbles to achieve the aim of efficient dehydrogenation.

Description

【Technical field】 [0001] The invention relates to the technical field of general methods for metal refining or remelting, in particular to a method and a device for degassing aluminum melts by re-blowing apex angles. 【Background technique】 [0002] The purification of aluminum melt is a key technology to ensure the metallurgical quality of pure aluminum and its alloys, and reducing the hydrogen content in aluminum melt is one of the main purposes of aluminum melt purification. At present, most of the hydrogen removal and purification methods of aluminum melt are based on the theory of bubble floatation, that is, a large number of bubbles are blown into the aluminum melt, and the partial pressure difference between the hydrogen in the aluminum melt and the bubbles is used to make the aluminum melt The hydrogen continuously diffuses into the bubbles, and floats up to the melt surface with the bubbles to escape, so as to achieve the purpose of dehydrogenation. [0003] Accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B21/06C22B9/05
Inventor 孙会
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO