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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 aluminum melt, the Ti element will be introduced into the melt after the purification treatment, and the alloy composition will be changed in a small range.

Method used

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  • Method for removing silicon out of aluminium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

Embodiment 2

[0035] Cast the aluminum alloy into a consumable electrode rod, the size of the aluminum alloy electrode is Φ62mm, and the weight is 11 kg; the arc starting agent is 12g of carbon electrode; the inner diameter of the crystallizer is 100mm; put the consumable electrode rod into the electroslag furnace, Add slag material and carry out electroslag remelting with a voltage of 40V and a current of 500-550A; when remelting the self-consumable electrode, pass argon gas into the crystallizer and control the current at 1000A; after the smelting is completed, cut off the power supply and cool , to obtain aluminum alloy, the selected electroslag material is 30% MgF 2 +30%KCl+40%MgCl 2 , the addition amount is 5% of the weight of the consumable electrode, which is 0.55 kg.

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

Embodiment 3

[0038] Cast the aluminum alloy into a consumable electrode rod, the size of the aluminum alloy electrode is Φ60mm, and the weight is 10 kg; the arc starting agent is 12g of carbon electrode; the inner diameter of the crystallizer is 100mm; put the consumable electrode rod into the electroslag furnace, Add slag material and carry out electroslag remelting with a voltage of 45V and a current of 500-600A; when remelting the self-consumable electrode, pass argon gas into the crystallizer and control the current at 600A; after the smelting is completed, cut off the power supply and cool down , to obtain aluminum alloy, the selected electroslag material is 30% MgF 2 +40%KCl+30%MgCl 2 , the addition amount is 5% of the weight of the consumable electrode, which is 0.5 kg.

[0039] In this example, the silicon content of the 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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