Aluminum alloy refining sodium removal method

An aluminum alloy, sodium removal technology, applied in the field of aluminum alloy refining, can solve the problems of poor sodium removal effect, high refining cost, time-consuming and laborious, etc.

Inactive Publication Date: 2018-07-27
湖北新金洋资源股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the sodium-removing refining agent is generally used for sodium-removing refining during the refining of aluminum melts. However, the sodium-removing effect of this refining process is poor. In order to meet the process index requirements, it is generally necessary to repeat the refining many times, which is time-consuming and laborious. And the refining cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1: The ADC12 aluminum alloy with a weight of one ton is put into a furnace for heating. When the temperature rises to 600°C, the aluminum alloy starts to melt, and a melt is obtained after the aluminum alloy is completely melted.

[0025] S2: Continue to heat the furnace with the furnace door open, raise the temperature of the melt in the furnace to 710°C, and keep the temperature stable for 10 minutes to fully react the sodium element in the melt. Compared with other metal elements, sodium element is more active and easy to oxidize. When the melt in the furnace is burned and heated, sodium contacts with oxygen in the air to generate oxidation scum, which can reduce part of the sodium element in the aluminum alloy.

[0026] S2': Add 10kg of ammonium acrylate and 0.8kg of ammonium phosphate as a strengthening agent to the melt, and fully stir the melt to make the sodium element in the melt fully contact with ammonium acrylate. Under the condition of ammonium phosphate a...

Embodiment 2

[0032] S1: The ADC12 aluminum alloy with a weight of one ton is put into a furnace for heating. When the temperature rises to 600°C, the aluminum alloy starts to melt, and a melt is obtained after the aluminum alloy is completely melted.

[0033] S2: Continue to heat the furnace with the furnace door open, raise the temperature of the melt in the furnace to 720°C, and control the temperature to be stable for 10 minutes to fully react the sodium element in the melt. Compared with other metal elements, sodium element is more active and easy to oxidize. When the melt in the furnace is burned and heated, sodium contacts with oxygen in the air to generate oxidation scum, which can reduce part of the sodium element in the aluminum alloy.

[0034] S2': Add 8kg of ammonium acrylate and 0.5kg of ammonium phosphate as a strengthening agent to the melt, and stir the melt fully to make the sodium element in the melt fully contact with ammonium acrylate. Under the condition of ammonium pho...

Embodiment 3

[0041] S1: The ADC12 aluminum alloy with a weight of one ton is put into a furnace for heating. When the temperature rises to 600°C, the aluminum alloy starts to melt, and a melt is obtained after the aluminum alloy is completely melted.

[0042] S2: Continue to heat the furnace with the furnace door open, raise the temperature of the melt in the furnace to 725°C, and keep the temperature stable for 8 minutes to fully react the sodium element in the melt. Compared with other metal elements, sodium element is more active and easy to oxidize. When the melt in the furnace is burned and heated, sodium contacts with oxygen in the air to generate oxidation scum, which can reduce part of the sodium element in the aluminum alloy.

[0043] S2': Add 10kg of ammonium acrylate and 0.5kg of ammonium phosphate as a strengthening agent to the melt, and fully stir the melt to make the sodium element in the melt fully contact with ammonium acrylate. Under the condition of ammonium phosphate as...

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PUM

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Abstract

The invention relates to the technical field of aluminum alloy refining, in particular to an aluminum alloy refining sodium removal method. The aluminum alloy refining sodium removal method is used for reducing the process cost and the time cost while improving the sodium removal effect. The aluminum alloy refining sodium removal method mainly comprises the steps of first, feeding alloy into a smelting furnace, carrying out heating to smelt the alloy so as to obtain melt; second, rising the temperature of the smelting furnace to the range from 710 DEG C to 725 DEG C, controlling the temperature to be stable, oxidizing sodium elements to create oxidized dross; third, continuing to carry out heating till the temperature rises to the range from 725 DEG C to 740 DEG C, closing the furnace doorof the smelting furnace, and jetting out nitrogen to blow the melt; fourth, carrying out melt standing; and fifth, slagging off to obtain the aluminum alloy melt without sodium. According to the aluminum alloy refining sodium removal method, because the sodium elements react with oxygen under the high temperature to create the oxidized dross, and the sodium elements react with the nitrogen underthe conditions of airtightness and high temperature to create the sodium azide dross, the sodium elements float on the surface of the aluminum melt in the form of dross, and then the aluminum alloy melt without sodium can be obtained after the dross is scooped out.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy refining, in particular to an aluminum alloy refining and desodination method. Background technique [0002] Sodium is one of the trace elements in aluminum melt. Although its content is very small, it has a great influence on the casting and processing properties of aluminum alloys, especially for hot cracks and cracking during hot rolling of aluminum alloy ingots with high magnesium content. greater impact. Sodium exists in the alloy as a low melting point impurity, and exists in the grain boundary in a free state. When its content is very small, it will also expand the lower limit temperature of the brittle zone during the crystallization process and reduce the strength and elongation of the brittle zone. When the shrinkage stress of the alloy exceeds its own strength, it causes cracks in the ingot. [0003] In the prior art, the sodium-removing refining agent is generally used for sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/00
CPCC22C1/03C22C1/026C22C1/06C22C21/00
Inventor 周毅周强龙在华陈精智苏木阳
Owner 湖北新金洋资源股份公司
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