A furnace device and method for preparing ultra-high-purity aluminum

Abstract

The invention belongs to the technical field of metal purification, and relates to a furnace pipe device and a method for preparing ultra-high purity aluminum. The furnace pipe device is characterized by sequentially comprising a furnace pipe outer frame, a thin-wall seal sleeve and a graphite crucible from outside to inside, wherein a hinge furnace lid is arranged at the upper part of the furnace pipe; a water inlet hole, a water outlet hole, an observation hole, an air exhaust hole, an air inlet hole, an exhaust vent, a temperature measuring hole and a pressure measuring hole are formed in the furnace lid; a rubber seal strip is arranged between the furnace lid and the furnace pipe outer frame; and the furnace lid is connected and fastened with the furnace pipe through buckles and bolts. The furnace pipe device disclosed by the invention is capable of melting aluminum one time; the crystal is 65Kg; the height of a crystal aluminum ingot can reach 90cm; the single production can be increased by 2.5 times in comparison with that of a conventional high-purity aluminum production technology; an argon protection environment is only kept in the furnace pipe; the furnace pipe device has no environmental requirements on heating and electromagnetic stirring devices, and is strong in continuous working ability; compared with a conventional production technology, the furnace pipe device and the method have the advantages that the power consumption is reduced by 2 / 3; and the energy consumption cost is saved by 3 / 5.

Description

technical field [0001] The invention belongs to the technical field of metal purification, and relates to a furnace device and method for preparing ultra-high-purity aluminum by directional solidification protected by argon. technical background [0002] The extraction of ultra-high-purity aluminum by segregation method has been widely used in the prior art. Chinese patent document number CN101191160 records a "high-purity aluminum extraction device", which is based on the segregation theory and uses the method of pulling up In this patent, a furnace structure for extracting high-purity aluminum is mentioned. This structure is only composed of a metal shell and a graphite crucible. There is no special description on the furnace cover. Such a structure has certain shortcomings. The shell is too thin to bear the weight of the crucible and the aluminum ingot, and the crucible may burst and the aluminum liquid may leak; In a high temperature state, heat is difficult to dissipat...

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Problems solved by technology

[0002] The extraction of ultra-high-purity aluminum by segregation method has been widely used in the prior art. Chinese patent document number CN101191160 records a "high-purity aluminum extraction device", which is based on the segregation theory and uses the method of pulling up In this patent, a furnace structure for extracting high-purity aluminum is mentioned. This structure is only composed of a metal shell and a graphite crucible. There is no special description on the furnace cover. Such a structure has certain shortcomings. The shell is too thin to bear the weight of the crucible and the aluminum ingot, and the crucible may burst and the aluminum liquid may leak; In a high temperature state, the heat is difficult to dissipate through the metal shell, resulting in poor cooling effect, poor purification effect, and long production cycle

[0003] A search of published patents found that Chinese Patent Document No. CN101696472A describes a "method for purifying ultra-high-purity aluminum". The purification furnace is moved into the crystallization furnace, and the molten aluminum in the purification furnace rotates in the heater of the crystallization furnace, and the purification effect is achieved by controlling the heat dissipation of the crystallization furnace; a vacuum purification furnace is mentioned in the patent, but it is not specified. The sealing method of the purification furnace and the internal structure of the purification furnace, different structures of the purification furnace will directly affect the purification effect of high-purity aluminum

[0004] Further search found that Chinese Patent Document No. CN101748281 recorded a "high-purity aluminum vacuum purification device", which placed the heating device, stirring device and heat insulation device in a vacuum environment, and based on the principle of directional solidification, the down-quoting method was used The growth method is to prepare high-purity aluminum. Although the structure of this invention is reasonable, the space of the vacuum furnace is large. In order to achieve the vacuum degree required by production, a two-stage vacuum pump is required. The power of the required vacuuming equipment is high, and the high vacuum degree is still difficult to guarantee. , leading to a decrease in the purification efficiency

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