Method for separating iron element impurities from secondary aluminum melt through pulse current

A pulse current and element impurity technology, applied in the field of purification of recycled aluminum melt, can solve the problems of aluminum alloy melt pollution, long time period, complicated operation, etc., and achieve the effect of continuous processing, easy implementation and simple operation

Active Publication Date: 2020-08-18
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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  • Method for separating iron element impurities from secondary aluminum melt through pulse current
  • Method for separating iron element impurities from secondary aluminum melt through pulse current

Examples

Experimental program
Comparison scheme
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 discloses a method for separating iron element impurities from secondary aluminum melt through pulse current, and belongs to the technical field of secondary aluminum melt purification.The method comprises the following steps that the secondary aluminum alloy melt with the iron element content exceeding the standard is placed in a crucible, two electrodes and a pulse power supply are connected and inserted into the aluminum melt in parallel, pulse current is continuously applied until corresponding time, and corresponding pulse parameters are selected according to the volume andthe temperature of the melt, wherein the pulse current treatment parameter range comprises the parameters that the frequency is 20 - 50kHz, the voltage is 1 - 100V, the current density is 0.1 - 700A/cm<2>, and the action time is 1 - 10h. According to the method, an Al element and a Fe element in the melt are subjected to electromigration in different directions under the action of the pulse current, so that the Al element and the Fe element are enriched at the positive electrode and the negative electrode respectively, and the purpose of purifying the aluminum melt is achieved; according tothe method for separating the iron element impurities from the secondary aluminum melt through the pulse current, the aluminum melt can be subjected to pulse current treatment under the condition thatno neutralizing element is added to pollute the melt, the iron impurity elements in the aluminum melt are separated, and the melt is purified; and the method is easy to operate, efficient and free ofpollution, the iron removal efficiency is greatly improved, and the requirement of current industrial green development planning is met.

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 Applications(China)
IPC IPC(8): C22B21/06C22B9/02C22C1/03C22C21/00
CPCC22B9/02C22B21/06C22C1/026C22C1/03C22C21/00Y02P10/20
Inventor 张新房徐雄秦书洋
Owner UNIV OF SCI & TECH BEIJING
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