Preparation method of high-purity aluminum

A high-purity, molten aluminum technology, applied in the field of metal aluminum segregation purification, can solve the problems of low purification efficiency and high energy consumption, and achieve the effects of improving purification efficiency, simplifying process steps and saving energy.

Active Publication Date: 2012-07-04
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the conventional high-purity aluminum purification process, no matter whether the three-layer liquid electrolysis method or the segregation method is used to produce high-purity aluminum, there are problems such as high energy consumption and low purification efficiency; at the same time, melting and solidification cannot be prevented during the purification process Intrusion of external impurity elements during the process, so it can only be used to produce pure aluminum with a purity lower than 4N, and it is completely unqualified for the production of high-purity aluminum with a purity higher than 5N

Method used

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Examples

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Embodiment 1

[0014] Example 1: Take 10kg of aluminum ingot (99.7Al) as the object of purification, use a smelting furnace to heat the metal aluminum to 670°C, keep it warm for 12 minutes to make the temperature of the molten aluminum in the furnace uniform, and reduce the temperature in the furnace at a rate of 0.1°C / min. When the monitoring temperature of the solidified aluminum at the top is 658°C, stop the cooling, and discharge the unsolidified aluminum liquid in the furnace from the bottom of the furnace. The discharged aluminum liquid is about 2kg, and the purity of the solidified metal aluminum in the furnace can reach 99.99Al. Close the bottom of the furnace, reheat the aluminum in the furnace to 670°C, and go through the above-mentioned purification process once more to purify the aluminum in the furnace to 99.9995Al.

Embodiment 2

[0015] Example 2: Take 10kg of molten aluminum (99.7Al) as the object of purification, use a smelting furnace to keep the temperature of the molten aluminum at 675°C, keep it warm for 10 minutes to make the temperature of the molten aluminum in the furnace uniform, and lower the temperature in the furnace at a rate of 0.5°C / min , until the monitoring temperature of the top solidified aluminum is 658°C, stop cooling, and discharge the unsolidified aluminum liquid in the furnace from the bottom of the furnace. The discharged aluminum liquid is about 2kg, and the purity of the solidified metal aluminum in the furnace can reach 99.95Al. Close the bottom of the furnace, reheat the aluminum in the furnace to 675°C, and then go through the above purification process twice to purify the aluminum in the furnace to 99.9995Al.

Embodiment 3

[0016] Example 3: Take 10kg of aluminum ingot (99.7Al) as the object of purification, use a smelting furnace to heat the metal aluminum to 680°C, keep it warm for 15 minutes to make the temperature of the molten aluminum in the furnace uniform, and lower the temperature in the furnace at a rate of 5°C / min. When the monitoring temperature of the solidified aluminum at the top is 658°C, the cooling is stopped, and the unsolidified aluminum liquid in the furnace is discharged from the bottom of the furnace. The discharged aluminum liquid is about 2kg, and the purity of the solidified metal aluminum in the furnace can reach 99.9Al. Close the bottom of the furnace, reheat the aluminum in the furnace to 680°C, and after four times of the above purification process, the aluminum in the furnace can be purified to 99.9995Al.

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Abstract

The invention relates to a method for segregation purification of metal aluminum. The method comprises the steps of: forming supercooling at the periphery and top of molten aluminum in a vacuum environment by accurately controlling the thermal field of the molten aluminum in a crucible, pushing the solidification interface from the periphery to center and from the top to the bottom by controlling a proper cooling rate, enriching impurity elements in the melt at the bottom center of the crucible by ingredient segregation, and opening a device at the crucible bottom to discharge the unsolidified molten aluminum at the lower part of the crucible when the impurity elements are enriched to a certain degree, so as to purify the solidified metal aluminum; and then keeping heating and repeating the purification process, thus enhancing the purification effect by several times of continuous purification processes with low energy consumption. According to the invention, the purification requirements can be achieved, the purification efficiency is increased and energy is saved.

Description

technical field [0001] The invention relates to a method for preparing high-purity aluminum, which belongs to the technical field of metal aluminum segregation and purification. Background technique [0002] Aluminum containing more than 99.9999% aluminum by weight is called ultra-pure aluminum, aluminum containing 99.999%-99.9999% aluminum is called high-purity aluminum, and aluminum containing 99.99%-99.999% aluminum is called refined aluminum. aluminum. Refined aluminum and ultra-high-purity aluminum have good electrical conductivity, plasticity, light reflection, ductility, corrosion resistance and extremely low magnetic permeability, so they are widely used in today's high-tech-led society . Especially in the industrial and technological fields such as electronics, energy, transportation, medical, computer, aerospace, astronomy and chemical industry. [0003] As early as the 1980s, France, the United States and other countries have done research on the purification p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/06
Inventor 杨钢赵伟方树铭王昶李玉章张玲
Owner KUNMING METALLURGY INST
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