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Aluminum scrap meltback purification process

A purification process, a technology for aluminum scraps, applied in the field of aluminum scrap remelting purification process, can solve the problems of low recovery rate, large smoke and dust, complex components, etc., and achieve the effect of improving purity and improving mechanical properties

Inactive Publication Date: 2012-09-19
赵凯志
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of aluminum alloy deep processing enterprises, aluminum alloy processing enterprises have produced a large amount of processing residues and waste aluminum chips in the production and processing process. These processing residues and waste aluminum chips are affected by non-metallic inclusions (AL 2 o 3 etc.) and hydrogen pollution, its composition is extremely complex, and the traditional purification and remelting process can easily cause secondary pollution due to its high cost, low recovery rate, and large smoke and dust during melting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Pretreatment: after drying and pulverizing the artificially picked aluminum chips, use a magnetic separator to remove iron impurities in the aluminum chips;

[0013] (2) Refining with nitrogen blowing: Melt the aluminum chips after the preliminary removal of impurities in the aluminum chip recycling furnace. When the temperature in the furnace reaches 710°C, blow nitrogen into the melting chamber to carry out compound refining. The melt depth in the molten pool is kept at 0.5m, and the blowing pressure is controlled at 18KPa. To remove inclusions such as gases and non-metals in the melt;

[0014] (3) Filtration and deslagging: add slagging agent to the molten aluminum for slagging, and use a foam ceramic filter to purify the molten aluminum alloy flowing to the use room;

[0015] (4) Secondary nitrogen blowing refining: In the use room, use porous and breathable ceramic bricks to break the nitrogen into fine bubbles, and take out the hydrogen and tiny impurities in...

Embodiment 2

[0018] (1) Pretreatment: after drying and pulverizing the artificially picked aluminum chips, use a magnetic separator to remove iron impurities in the aluminum chips;

[0019] (2) Refining with nitrogen blowing: Melt the aluminum scraps after the preliminary removal of impurities in the aluminum scrap recycling furnace. When the temperature in the furnace reaches 720°C, blow nitrogen gas into the melting chamber to carry out compound refining. The melt depth in the molten pool is kept at 0.7m, and the blowing pressure is controlled at 20KPa. To remove inclusions such as gases and non-metals in the melt;

[0020] (3) Filtration and deslagging: add slagging agent to the molten aluminum for slagging, and use a foam ceramic filter to purify the molten aluminum alloy flowing to the use room;

[0021] (4) Secondary nitrogen blowing refining: In the use room, use porous and breathable ceramic bricks to break the nitrogen into fine bubbles, and take out the hydrogen and tiny impurit...

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Abstract

The invention discloses an aluminum scrap meltback purification process which comprises (1) utilizing a magnetic separator to remove iron impurities in aluminum scraps which are dried and smashed after manual selection; (2) enabling the aluminum scraps after primary impurity removal to be melt in an aluminum scrap meltback furnace, and when the temperature in the furnace reaches 710-720 DEG C, introducing nitrogen to blow high-efficiency active flux into a melting chamber to perform composite refining to remove gas, non-metal impurities and the like in the flux; (3) adding slag beating agents into aluminum liquid to perform slag beating, and utilizing a foam ceramic filter screen to purify aluminum alloy liquid flowing to a using chamber; (4) in the using chamber, utilizing a multipore blowing head (breathable ceramic brick) to smash the nitrogen into fine air bubbles, and enabling hydrogen and micro-impurities in the aluminum alloy liquid to be brought out by increasing contact area and time of the air bubbles and the flux; and (5) standing the aluminum alloy liquid flowing to the using chamber for 30-45 minutes, then removing separated floating fine impurities in the flux and performing heat preservation for standby application.

Description

technical field [0001] The invention belongs to the field of new materials-metallurgy, and in particular relates to a process for remelting and purifying aluminum chips. Background technique [0002] With the rapid development of aluminum alloy deep processing enterprises, aluminum alloy processing enterprises have produced a large amount of processing residues and waste aluminum chips in the production and processing process. These processing residues and waste aluminum chips are affected by non-metallic inclusions (AL 2 o 3 etc.) and hydrogen pollution, the composition of which is extremely complex, and the traditional purification and remelting process can easily cause secondary pollution due to its high cost, low recovery rate, and large smoke and dust during melting. Therefore, the smelting and purification process of recycled aluminum chips needs to be improved urgently. Contents of the invention [0003] The purpose of the present invention is to overcome the shor...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/06
CPCY02P10/20
Inventor 赵凯志
Owner 赵凯志
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