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Ultra-pure aluminum purification crystallization method

A technology of crystallization and pure aluminum, applied in the field of purification crystallization of ultra-high-purity aluminum, which can solve the problems of low product purity, low purification efficiency, and easy generation of oxides, so as to achieve a stable liquid level and reduce the generation of oxides , to reduce the effect of exposure

Active Publication Date: 2019-04-26
宁波锦越新材料有限公司
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Problems solved by technology

[0008] The present invention designs a crystallization method for ultra-high-purity aluminum, which solves the technical problem that the existing crystallization method cannot keep the aluminum liquid level from being driven while maintaining high-speed rotation, resulting in contact between the aluminum liquid and the air. It is easy to produce oxides, the product purity is not high, and the purification efficiency is low

Method used

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Examples

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Embodiment

[0037] Embodiment: Take the purification of 5N aluminum to 5N5 as an example.

[0038] Step 1: Melting a certain amount of 5N aluminum block in a crucible, keeping the temperature at 660-680°C.

[0039] Step 2. Install the purification and crystallization device above the crucible. At this time, the upper rotor 9 and the lower rotor 10 are inserted under the liquid aluminum surface, and the upper rotor 9 is located below the aluminum liquid surface.

[0040] Step 3: 50-100 L / min of normal-temperature air is continuously fed into the crystallization device.

[0041] Step 4: Turn on the rotating motor 3 to continuously rotate the lower rotor 10, control the steering motor 6, so that the upper rotor 9 and the lower rotor 10 rotate in opposite directions, increase the speed to about 80rpm and keep the liquid level from being driven, and rotate During the process, the aluminum liquid with high purity is preferentially solidified due to the cooling action of the crystallization dev...

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Abstract

The invention relates to an ultra-pure aluminum purification crystallization method. The method comprises the following steps that an aluminum raw material of which the purity is 3-5N is melted into molten aluminum in a crucible; a crystallization device is installed on the upper portion of the crucible, the lower end of the crystallization device stretches into the surface of the molten aluminum,and normal-temperature air at 50-100L / min is continuously injected into the crystallization device through an air feeding pipe arranged at the upper end of the crystallization device; a motor is started to drive the crystallization device to rotate continuously, the rotation speed of the motor is increased, it is kept that the surface of the molten aluminum is not influenced, high-purity part ofthe molten aluminum solidifies and stacks at the lower end of the crystallization device and forms a crystal substance; when the size of the crystal substance reaches half of the set size, the crystallization device is taken out and stopped rotating, the lower end of the crystallization device and the crystal substance are quickly cooled in the air to 280-320 DEG C, then, the crystallization device is inserted into the molten aluminum to continue rotating till the crystal substance cannot be increased, and the crystal substance is taken down; and 50-70 mm portions of the head and tail of the crystal substance are cut off, and a preliminary purification substance is obtained. The ultra-pure aluminum purification crystallization method is simpler and more efficient in technology, more practical, and more suitable for industrial production.

Description

technical field [0001] The invention relates to a method for purifying metal aluminum, in particular to a method for purifying and crystallizing ultrahigh-purity aluminum. Background technique [0002] Aluminum products with a purity above 5N5 are called ultra-high-purity aluminum. Ultra-high-purity aluminum is widely used in the fields of electronics, aviation, navigation, chemical industry and defense industry, and its consumption is increasing year by year. But now there are very few domestic enterprises that can produce 5N5 ultra-high-purity aluminum that meet the needs of users, and there are only a handful of research and development units. Therefore, almost all ultra-high-purity aluminum needed in China depends on imports. [0003] Although some domestic companies are already in trial production, there is a big gap with similar foreign companies and they cannot meet domestic demand. Therefore, research and development of new production methods to replace imports has ...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B21/06
CPCC22B9/02C22B21/06Y02P10/20
Inventor 张瑾大岩一彦姚科科广田二郎周建波叶翔
Owner 宁波锦越新材料有限公司
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