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Sodium removing method for molten aluminum

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

Inactive Publication Date: 2018-07-31
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 accelerator ammonium nitrite 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 nitrite as accelerator, th...

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 accelerator ammonium nitrite 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 nitrite as acceler...

Embodiment 3

[0040] 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.

[0041] 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.

[0042] S2': Add 10kg of ammonium acrylate and 0.5kg of accelerator ammonium nitrite 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 nitrite as accelerator, the...

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Abstract

The invention relates to the technical field of aluminum alloy refining, especially relates to a sodium removing method for molten aluminum and aims at improving a sodium removing effect and reducingtechnological cost and time cost at the same time. The sodium removing method comprises the following main steps: S1, adding alloy into a smelting furnace and heating to smelt the alloy into melt; S2,improving a temperature of the smelting furnace to 710 to 725 DEG C, controlling the temperature stably and oxidizing sodium element to generate oxidized dross; S3, continuing heating, improving thetemperature to 725 to 740 DEG C, closing a furnace door of the smelting furnace and utilizing nitrogen to blow the melt; S4, standing the melt; S5, removing dross to obtain sodium-removed aluminum alloy melt. According to the sodium removing method disclosed by the invention, sodium element and oxygen react to generate the oxidized dross under the high temperature, and sodium element and nitrogenreact to generate sodium azide dross under the sealed high-temperature condition; thus, the sodium element can float on the surface of the molten aluminum in a dross mode, then the dross is fished out, and the sodium-removed aluminum alloy melt can be obtained.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy refining, in particular to a method for removing sodium from an aluminum melt. 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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IPC IPC(8): C22C1/06C22C1/02C22C21/00
CPCC22C1/06C22C1/026C22C21/00
Inventor 苏木阳周毅周强龙在华陈精智
Owner 湖北新金洋资源股份公司
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