Ultrahigh-purity aluminum crystallization method

Abstract

The invention discloses an ultrahigh-purity aluminum crystallization method. The ultrahigh-purity aluminum crystallization method comprises the following steps of: selecting a high-purity aluminum raw material and melting the high-purity aluminum raw material into aluminum liquid in a graphite crucible; inserting a crystallization device into the graphite crucible; driving a graphite pipe sleeve to rotate synchronously by a rotary device; continuously introducing cooling gas into a gas cooling system in the graphite pipe sleeve to start crystallization; keeping a constant rotary speed of a crystallization machine in a crystallization process; adjusting the flowing direction of the cooling gas in a cooling gas path so that the surface of the graphite pipe sleeve, which is in contact with the aluminum liquid, is directionally solidified and an inverted mushroom type high-purity crystal substance with a certain thickness is separated out; when crystallization set time is reached, stopping the crystallization device from rotating and then stopping introducing the cooling gas into a rotary body; lifting the crystallization device out from the graphite crucible and picking off the crystal substance on the graphite pipe sleeve below the crystallization machine to obtain the high-purity crystal substance; and pouring out the residual aluminum liquid in the crucible and putting the high-purity crystal substance into the crucible again to be repeatedly crystallized to obtain the crystal substance with higher purity. By adopting the method disclosed by the invention, the problems in the prior art that the purification cost is high and the purification effect is not good are solved.

Description

Technical field [0001] The present invention relates to the purity of metal aluminum, and more particularly to a super high purity aluminum crystal crystal crystal crystal. Background technique [0002] Aluminum products with purity at 5N5 are called ultra-high purity aluminum, and ultra-high purity aluminum has a wide range of applications in the fields of electronics, aviation, navigation, chemical and national defense industries, and increased year by year. However, there are few countries that can produce 5N5 ultra-high purity aluminum that meet the needs of users, and the R & D unit is also in number, so the super high pure aluminum required in China is almost all imported. [0003] In the prior art, an ultra-high purity aluminum purification method is proposed in the invention, including the selection of aluminum purity of at least 4 N6, and the inner wall is coated with an antioxidant layer; the seed crystal is 5n aluminum. Material; aluminum liquid holding at 680 ° C ~ 70...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an ultra-high-purity aluminum crystallization method, which solves the problems of high purification cost and poor purification effect in the prior art

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