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A method for separating iron element impurities by pulse current in recycled aluminum melt

A pulse current and iron impurity technology is applied in the field of removing iron impurity elements in regenerated aluminum melt, which can solve the problems of aluminum alloy melt pollution, long time period, complicated operation, etc., and achieves the effect of continuous processing, easy implementation and simple operation.

Active Publication Date: 2021-08-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned separation methods have their own advantages and disadvantages. The common problems are complex operation, long time period, and low efficiency, and all of them need to add intermediate elements to the melt as iron removers, which will further pollute the aluminum alloy melt.

Method used

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  • A method for separating iron element impurities by pulse current in recycled aluminum melt
  • A method for separating iron element impurities by pulse current in recycled aluminum melt

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Experimental program
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Effect test

Embodiment 1

[0024] In this embodiment, pulse current treatment is performed on the Al-2.2% Fe melt in the crucible. Specific steps are as follows:

[0025] Step 1: Put the configured Al-2.2% Fe alloy material into a crucible and heat it in a resistance furnace to 1200°C for 60 minutes. To ensure that the acicular iron-rich phase in the master alloy Al-20%Fe is completely dissolved and the melt is homogenized. The size of the crucible is Φ50mm (inner diameter)×60mm.

[0026] Step 2: Determine the pulse processing parameters. Set the parameter range of the pulse current, and determine the pulse current parameters as frequency 31kHz, voltage 8V, pulse current density 9.8A / cm 2 , The action time is 70min.

[0027] The third step: pulse current treatment. When the Al-2.2% Fe melt is cooled down to 900°C with the furnace, two electrodes are inserted into the melt in parallel, and the pulse current treatment is started. After holding at this temperature for 10 minutes, cut off the heating ...

Embodiment 2

[0032] In this embodiment, pulse current treatment is performed on the Al-2.2% Fe melt in the crucible. Specific steps are as follows:

[0033] Step 1: Put the configured Al-2.2% Fe alloy material into a crucible and heat it in a resistance furnace to 1200°C for 60 minutes. To ensure that the acicular iron-rich phase in the master alloy Al-20%Fe is completely dissolved and the melt is homogenized. The size of the crucible is Φ50mm (inner diameter)×60mm.

[0034] The second step: determine the pulse current processing parameters. Set the parameter range of the pulse current, and determine the pulse current parameters as frequency 10kHz, voltage 12V, pulse current density 24.5A / cm 2 , The action time is 70min.

[0035] The third step: pulse current treatment. When the Al-2.2% Fe melt is cooled down to 900°C with the furnace, two electrodes are inserted into the melt in parallel, and the pulse current treatment is started. After holding at this temperature for 10 minutes, c...

Embodiment 3

[0040] In this embodiment, pulse current treatment is performed on the Al-2.2% Fe melt in the crucible. Specific steps are as follows:

[0041] Step 1: Put the configured Al-2.2% Fe alloy material into a crucible and place it in a resistance furnace to heat to 1200°C and keep it warm for 60min. To ensure that the acicular iron-rich phase in the master alloy Al-20%Fe is completely dissolved and the melt is homogenized. The size of the crucible is Φ70mm (inner diameter)×70mm.

[0042] The second step: determine the pulse current processing parameters. Set the parameter range of the pulse current, and determine the pulse current parameters as frequency 200Hz, voltage 24V, pulse current density 49A / cm 2 , the action time is 10min.

[0043] The third step: pulse current treatment. When the Al-2.2% Fe melt is cooled down to 750°C with the furnace, two electrodes are inserted into the melt in parallel, and the pulse current treatment is started. After holding at this temperatur...

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Abstract

The invention relates to a method for separating impurities of iron element by pulse current in recycled aluminum melt, which belongs to the technical field of purification of recycled aluminum melt. Place the secondary aluminum alloy melt with excessive iron content in the crucible, connect the two electrodes with the pulse power supply and insert them into the aluminum melt in parallel, continue to apply the pulse current until the corresponding time, and select the corresponding pulse according to the volume and temperature of the melt parameter. Pulse current processing parameter range: frequency 20~50kHz, voltage 1~100V, current density 0.1~700A / cm 2 , Action time 1min ~ 10h. The method utilizes the electromigration of Al elements and Fe elements in the melt in different directions under the action of a pulse current to enrich them at the positive electrode and the negative electrode respectively, so as to achieve the purpose of purifying the aluminum melt. The invention can carry out pulse current treatment on the aluminum melt without adding any neutralizing element to pollute the melt, so as to realize the separation of iron impurity elements in the aluminum melt and purify the melt. The method is simple, efficient, and pollution-free, greatly improves the efficiency of iron removal, and meets the requirements of the current industrial green development plan.

Description

technical field [0001] The invention belongs to the technical field of purification of recycled aluminum melts, and in particular relates to a method for realizing the separation of Al-Fe in aluminum melts by pulse current, thereby removing iron impurity elements in recycled aluminum melts. Background technique [0002] Aluminum alloy has been widely used in automobile, aviation, electronics, construction and other fields due to its excellent performance. Moreover, aluminum and its aluminum alloys are highly recyclable and are the metal materials with the most recycling value. The recycling of aluminum and its alloys has significant environmental and economic benefits. Compared with the production of primary aluminum, the comprehensive energy consumption of producing secondary aluminum is only 5% of that of electrolytic aluminum, but CO 2 emissions can be reduced by more than 90%. Therefore, while rationally developing and utilizing energy and bauxite resources, attention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B21/06C22B9/02C22C1/03C22C21/00
CPCC22B9/02C22B21/06C22C1/026C22C1/03C22C21/00Y02P10/20
Inventor 张新房孙亚敏徐雄秦书洋
Owner UNIV OF SCI & TECH BEIJING
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