Method for removing silicon out of aluminium alloy

A technology of aluminum alloy and silicon element, applied in the field of metal materials, can solve problems such as changing alloy composition, and achieve the effect of effective removal, low price and wide source.

Inactive Publication Date: 2010-01-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively remove the impurity silicon element in the aluminum melt, but because the Ti element has a certain solubility in the alumi

Method used

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  • Method for removing silicon out of aluminium alloy

Examples

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Effect test

Example Embodiment

[0031] Example 1

[0032] Pouring aluminum alloy into consumable electrode rods, aluminum alloy electrode size is Φ70mm, weight 12 kg; arc starting agent is carbon electrode 15g; mold inner diameter size is 100mm; put the consumable electrode rod into the electroslag furnace, Add slag material and perform electroslag remelting, the voltage is 40V, the current is 300-400A; when remelting the consumable electrode, pass argon into the crystallizer, and the current is controlled at 300A; after the smelting is completed, cut off the power supply and cool down , Get aluminum alloy, the electroslag slag material selected is Na 3 AlF 6 , The added amount is 15% of the weight of the consumable electrode, which is 1.8 kg.

[0033] In this example, the silicon content of an aluminum alloy with a silicon content of 0.33% is reduced to 0.17% after refining.

Example Embodiment

[0034] Example 2

[0035] Pouring aluminum alloy into consumable electrode rods, aluminum alloy electrode size is Φ62mm, weight 11kg; arc starting agent is carbon electrode 12g; mold inner diameter size is 100mm; put the consumable electrode rod in the electroslag furnace, Add slag material and perform electroslag remelting, the voltage is 40V, the current is 500-550A; when remelting the consumable electrode, pass argon into the crystallizer, and the current is controlled at 1000A; after the smelting is completed, cut off the power supply and cool down , Get aluminum alloy, the selected electroslag slag material is 30% MgF 2 +30%KCl+40%MgCl 2 , The added amount is 5% of the weight of the consumable electrode, which is 0.55 kg.

[0036] In this example, the silicon content of an aluminum alloy with a silicon content of 0.20% is reduced to 0.12% after refining.

Example Embodiment

[0037] Example 3

[0038] Cast aluminum alloy into consumable electrode rods, the size of aluminum alloy electrode is Φ60mm, weight 10kg; the arc starter is carbon electrode 12g; the inner diameter of mold is 100mm; put the consumable electrode rod into the electroslag furnace, Add slag material and perform electroslag remelting, the voltage is 45V, and the current is 500-600A; when remelting the consumable electrode, pass argon into the crystallizer and the current is controlled at 600A; after the smelting is completed, cut off the power supply and cool down , Get aluminum alloy, the selected electroslag slag material is 30% MgF 2 +40%KCl+30%MgCl 2 , The added amount is 5% of the weight of the consumable electrode, which is 0.5 kg.

[0039] In this example, the silicon content of an aluminum alloy with a silicon content of 0.22% is reduced to 0.11% after refining.

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Abstract

The invention relates to a method for removing silicon out of aluminium alloys, which belongs to the technical field of metal materials. The method comprises the following steps: pouring aluminium alloys into consumable electrode bars; putting the consumable electrode bars into an electroslag furnace, and adding slag into the electoslag furnace for remelting; cutting off the power supply after melting, and cooling the mixture to obtain aluminium alloys. The slag is one of the following compounds in percentage by weight: 5 to 30 percent of MgF2 plus 30 to 40 percent of KCl plus 30 to 60 percent of MgCl2, 5 to 30 percent of MgF2 plus 30 to 40 percent of KCl plus 30 to 60 percent of NaCl, 100 percent of Na3AlF6, 10 to 30 percent of Na3AlF6 plus 30 to 40 percent of KCl plus 30 to 60 percent of NaCl, 10 to 30 percent of Na3AlF6 plus 30 to 40 percent of KCl plus 30 to 60 percent of MgCl2, 5 to 30 percent of CaF2 plus 30 to 40 percent of KCl plus 30 to 60 percent of CaCl2 and 5 to 30 percent of CaF2 plus 30 to 40 percent of KCl plus 30 to 60 percent of NaCl. The method is simple, and can effectively remove the low-consistency impurity silicon out of aluminium alloys without introducing new impurities.

Description

technical field [0001] The invention relates to a method for removing impurities in the technical field of metal materials, in particular to a method for removing silicon in aluminum alloys. Background technique [0002] Because aluminum alloy has a series of advantages such as low density, high specific strength, good corrosion resistance and formability, and low cost, it is widely used in transportation, electronics, bridges, decoration and other industries, and its usage ranks first among non-ferrous metal materials. With the continuous expansion of aluminum alloy applications, the requirements for its purity are getting higher and higher. Silicon is the main impurity element in most deformed aluminum alloys, which is mainly introduced by the raw materials (primary aluminum, etc.) for preparing deformed aluminum alloys. In addition, the contact with refractory materials during the aluminum alloy smelting process will also cause silicon pollution. And these silicon elemen...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/00C22B9/18
Inventor 王俊祝国梁陈冲疏达孙宝德
Owner SHANGHAI JIAO TONG UNIV
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