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Electromagnetic filter method for removing iron element from aluminium-silicon alloy

An aluminum-silicon alloy and electromagnetic filtration technology, applied in the field of metallurgy, can solve problems such as complex process, low removal efficiency, and singleness, and achieve the effects of simple process, improved cleanliness, and pollution avoidance

Inactive Publication Date: 2002-06-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods are a combination of filtration, sedimentation and centrifugation. Since the sedimentation and centrifugation are used, and only a single filtration is used, there are problems such as complex process and low removal efficiency.

Method used

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  • Electromagnetic filter method for removing iron element from aluminium-silicon alloy
  • Electromagnetic filter method for removing iron element from aluminium-silicon alloy
  • Electromagnetic filter method for removing iron element from aluminium-silicon alloy

Examples

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Effect test

Embodiment 1

[0023] Al-11.70wt% Si alloy is used, which contains 1.13wt% Fe. Melt in a resistance furnace, add Mn1.22wt% after melting, keep warm at 700°C for 30min, and perform electromagnetic filtration at 600°C. The Fe element in the Al-Si alloy is filtered by using the electromagnetic force application method of a steady magnetic field and a direct current. The cross-section of the single hole of the ceramic straight hole filter is 5mm×15mm, the length is 120mm, and the electromagnetic force is 1.5×10 4 N / m 3 . The contents of iron and manganese in the alloy after electromagnetic filtration are Fe0.67wt% and Mn0.50wt%, respectively.

Embodiment 2

[0025] On the basis of Example 1, carry out secondary filtration. A eutectic Al-11.70wt% Si alloy is used, which contains 0.67wt% Fe and 0.50wt% Mn. Melt in a resistance furnace, add Mn0.20wt% after melting, keep warm at 570°C for 50min, and perform electromagnetic filtration at 560°C. The Fe element in the Al-Si alloy is filtered by using the electromagnetic force application method of a steady magnetic field and a direct current. The cross-section of the single hole of the ceramic straight hole filter is 5mm×15mm, the length is 120mm, and the electromagnetic force is 1.5×10 4 N / m 3 . The contents of iron and manganese in the alloy after electromagnetic filtration are Fe0.41wt% and Mn0.28wt%, respectively.

Embodiment 3

[0027] A eutectic Al-11.70wt% Si alloy is used, which contains 1.15wt% Fe. Melt in a resistance furnace, add Mn1.55wt% after melting, keep warm at 720°C for 30min, and perform electromagnetic filtration at 580°C. A high-frequency magnetic field is used to filter Fe elements in Al-Si alloys. The cross-sectional diameter of the single hole of the ceramic straight hole filter is 5mm, the length is 150mm, the length of the coil is 200mm, the frequency of the magnetic field is 15kHz, and the power is 20kW. The contents of iron and manganese in the alloy after electromagnetic filtration are Fe0.78wt% and Mn0.45wt%, respectively.

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Abstract

The electromagnetic filtering method for removing iron element from aluminium silicon alloy includes the following steps: firstly, adding managanese in eutectic aluminium-silicon alloy melt and making the iron element separate out in the form of nascent iron-rich phase in the melt; then according to the difference of electric conductivity between the nascent iron-rich phase and melt self-body to make the nascent phase be separated out from the melt, under the action of eledctromagnetic force adopting the method for electromagnetically filtering nascent iron-rich phase to reduce iron content in the aluminium-silicon alloy melt. The electromaglnetic force application mode can adopt D.C. current applied stable and constant magnetic field or high-frequency magnetic field. Said ivnention features simple process, high efficiency and continuous treatment, and can raise purity of metal melt.

Description

Technical field: [0001] The invention relates to a new electromagnetic filtering method for removing iron element (Fe) in aluminum-silicon (Al-Si) alloy, belonging to the technical field of metallurgy. Background technique: [0002] National standards generally limit the Fe content of cast aluminum alloys to less than 0.7wt%. For example, my country's GB1173-74 stipulates that the Fe content in ZL109 and ZL108 piston alloys is limited to below 0.5wt% and 0.7wt%, respectively. Aluminum alloy inevitably contains a certain amount of impurity Fe, which mainly comes from crucibles, melting tools and casting molds used in the melting and casting process. In addition, every remelting of the returned material will increase the Fe content in the aluminum alloy, and after repeated reuse, the Fe content in the aluminum alloy will gradually increase. When the Fe content in the aluminum alloy exceeds a certain range, it can only be downgraded and used, resulting in a lot of waste. [...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22C1/00C22C21/02
Inventor 许振明李天晓周尧和
Owner SHANGHAI JIAO TONG UNIV
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