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Method and apparatus for separation and purification of high-purity aluminum

A purification method and high-purity technology, which is applied in the field of purification of high-purity aluminum, can solve the problems of depending on the purification effect, complicated process, and large amount of consumables, and achieve the effects of expanding the source range of raw materials, improving purification efficiency, and reducing raw material costs

Inactive Publication Date: 2014-07-02
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purity of aluminum extracted by the three-layer liquid electrolytic refining method is between 4N and 5.5N, but the power consumption is generally above 13000kwh / t, which is about 4 to 5 times that of the segregation method, and the energy consumption is high; at the same time, the electrolysis process produces Harmful gases such as fluorine chlorides seriously pollute the environment
The zone smelting method can obtain 5.5N to 6N high-purity aluminum, which is mainly used to further purify the high-purity aluminum by the three-layer electrolytic refining method or other segregation methods. The equipment is complicated, the efficiency is low, and the energy consumption is high, so it is not suitable for industrial production.
Directional solidification can obtain 4N to 6N high-purity aluminum, but its complex process, small size, and low output make it difficult to achieve mass production
The fractional crystallization method has been widely used industrially at home and abroad. The purification effect depends on the purity of the primary aluminum. Generally, 99.5-99.95% of the aluminum raw material is used to obtain high-purity aluminum of 3.5N to 6N after purification. However, the existing process requires High, low production efficiency, large amount of consumables and other shortcomings, need to be further optimized and improved

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  • Method and apparatus for separation and purification of high-purity aluminum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Use 27.5Kg of industrial primary aluminum with a purity of 99.7% as raw material, clean and dry its surface;

[0030] 2) Put the prepared raw materials into the smelting furnace, heat to 750°C until completely melted and then keep it warm for 1 hour;

[0031] 3) Add the refining agent intermediate alloy (aluminum-boron alloy), start the agitator to stir the reaction, let it stand for heat preservation, open the lower outlet, release the 2.5Kg aluminum liquid in the bottom layer, and transfer the 25Kg aluminum liquid in the upper layer to the segregation furnace;

[0032] 4) Segregation and crystallization, heat the segregation furnace to 660°C for 1 hour, turn on the annular gas cooling pipe, turn on the compaction device, and turn on the intermittent ultrasonic crystal stripping device. After 4 hours, stop when the aluminum liquid remains 25%, and remove the upper layer of aluminum liquid poured out;

[0033] 5) Lift the stainless steel crucible and cool it to room...

Embodiment 2

[0036] 1) Use 30Kg of industrial primary aluminum with a purity of 99.996% as raw material, clean and dry its surface;

[0037] 2) Put the prepared raw materials into the smelting furnace, heat to 680°C until completely melted, and keep warm for 1.5 hours;

[0038] 3) Add the refining agent intermediate alloy (aluminum-boron alloy), start the stirrer to stir the reaction, let it stand for heat preservation, open the lower outlet, release the 3Kg aluminum liquid in the bottom layer, and transfer the 27Kg aluminum liquid in the upper layer to the segregation furnace;

[0039] 4) Segregation crystallization, heat the segregation furnace resistance to 665°C for 2 hours, open the annular gas cooling pipe, open the compaction device, and open the intermittent ultrasonic crystal stripping device. After 4 hours, stop when the aluminum liquid remains 35%, and the upper layer of aluminum liquid poured out;

[0040] 5) Lift the stainless steel crucible and cool it to room temperature, t...

Embodiment 3

[0043] 1) Use 27.5Kg of industrial primary aluminum with a purity of 99.7% as raw material, clean and dry its surface;

[0044] 2) Put the prepared raw materials into the smelting furnace, heat to 720°C until completely melted, and then keep warm for 0.5 hours;

[0045] 3) Add the refining agent intermediate alloy (aluminum-boron alloy), start the agitator to stir the reaction, let it stand for heat preservation, open the lower outlet, release the 2.5Kg aluminum liquid in the bottom layer, and transfer the 25Kg aluminum liquid in the upper layer to the segregation furnace;

[0046] 4) Segregation and crystallization, heat the segregation furnace to 560°C for 1.5 hours, open the annular gas cooling pipe, open the compaction device, and open the intermittent ultrasonic crystal stripping device. After 4 hours, stop when the remaining 25% of the aluminum liquid, and remove the upper layer of aluminum liquid poured out,

[0047]5) Lift the stainless steel crucible and cool it to r...

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Abstract

The invention provides a method for separation and purification of high-purity aluminum. According to the method, the high-purity aluminum is prepared from primary aluminum by virtue of a smelting method, a segregation method and a batch ultrasonic separation method, wherein the purity of the produced qualified high-purity aluminum can be 99.99-99.9999%. Specifically, the method comprises the following steps: loading the raw material in a smelting furnace, and heating to 680-750 DEG C so that the raw material is melted into molten aluminum; adding a refining agent and smelting, and then discharging 1-10% of molten aluminum at the bottom; transferring the rest molten aluminum into a segregation furnace; adjusting the flow rate of cooling gas and cooling the wall of the furnace at 558-665 DEG C, and then carrying out segregation and crystallization; vibrating the segregated crystals by use of ultrasonic waves, and when the segregated crystals are separated from the wall of the segregation furnace until 15-35% of alumium liquid is left in a crystallization furnace, pouring out the residual liquid; cooling a crystallized alumium ingot and then taking out; and removing 3-15% of the weight of the ingot from the head and the tail parts of the crystallized ingot respectively, thus obtaining the high-purity aluminum product.

Description

technical field [0001] The invention relates to a method for purifying metal aluminum, in particular to a method and equipment for purifying high-purity aluminum. Background technique [0002] With the continuous progress and development of science and technology, high-purity aluminum is widely used in the fields of electronics, aviation, aerospace and defense industries, and its consumption is increasing year by year. At present, most countries in the world use three-layer liquid electrolytic refining, segregation purification, organic solution electrolysis, etc. to prepare high-purity or ultra-high-purity aluminum of various purity. The purity of aluminum extracted by the three-layer liquid electrolytic refining method is between 4N and 5.5N, but the power consumption is generally above 13000kwh / t, which is about 4 to 5 times that of the segregation method, and the energy consumption is high; at the same time, the electrolysis process produces Harmful gases such as fluori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/06C22B9/10C22B9/02
CPCY02P10/20
Inventor 何天明何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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