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Aluminum alloy smelting sodium removal technology

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

Inactive Publication Date: 2018-08-24
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: Put ADC12 aluminum alloy weighing one ton into a furnace for heating. When the temperature rises to 600°C, the aluminum alloy begins to melt, and the melt is obtained after the aluminum alloy is completely melted.

[0025] S2: Continue to heat the furnace with the furnace door in an open state, increase the temperature of the melt in the furnace to 710°C, and control the temperature to stabilize 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 produce oxidized scum, which can reduce part of the sodium element in aluminum alloy.

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

Embodiment 2

[0032] S1: Put ADC12 aluminum alloy weighing one ton into a furnace for heating. When the temperature rises to 600°C, the aluminum alloy begins to melt, and the melt is obtained after the aluminum alloy is completely melted.

[0033] S2: Continue to heat the furnace with the furnace door open to increase the temperature of the melt in the furnace to 720°C, and control the temperature to stabilize 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 produce oxidized scum, which can reduce part of the sodium element in aluminum alloy.

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

Embodiment 3

[0040] S1: Put ADC12 aluminum alloy weighing one ton into a furnace for heating. When the temperature rises to 600°C, the aluminum alloy begins to melt, and the melt is obtained after the aluminum alloy is completely melted.

[0041] S2: Continue to heat the furnace with the furnace door open to increase the temperature of the melt in the furnace to 725°C, and control the temperature to stabilize 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 produce oxidized scum, which can reduce part of the sodium element in aluminum alloy.

[0042] S2': Add 10kg of ammonium acrylate and 0.5kg of catalyst ammonium sulfite to the melt, and fully stir the melt to make the sodium element in the melt fully contact the ammonium acrylate. Under the condition of ammonium sulfite as a catalyst, the sodium element...

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Abstract

The invention relates to the technical field of aluminum alloy refining, and especially relates to an aluminum alloy smelting sodium removal technology. The invention aims to improve the sodium removal effect and reduce the process cost and the time cost. The technology mainly comprises the following steps: S1, adding alloy into a smelting furnace, and heating and melting the alloy to form a melt;S2, raising the temperature of the smelting furnace to 710-725 DEG C, and controlling the temperature to be stable in order to oxidize the sodium element into oxidized dross; S3, performing continuous heating to raise the temperature to 725-740 DEG C, closing the furnace door of the smelting furnace, and blowing the melt with nitrogen; S4, standing the melt; and S5, removing slag to obtain a sodium-removed aluminum alloy melt. The sodium element reacts with oxygen at a high temperature to generate the oxidized dross, and the sodium element reacts with nitrogen under closed high-temperature conditions to generate sodium azide dross in order to make the element float on the surface of the aluminum melt in a dross form, and the dross is removed to obtain the sodium-removed aluminum alloy melt.

Description

Technical field [0001] The invention relates to the technical field of aluminum alloy refining, in particular to a process for removing sodium from aluminum alloy smelting. Background technique [0002] Sodium is one of the trace elements in aluminum melt. Although its content is small, it has a great influence on the casting processability of aluminum alloy, especially the hot cracking of aluminum alloy ingots with high magnesium content and cracking during hot rolling. The impact is greater. 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 increase the lower limit temperature of the brittle zone during the crystallization process and reduce the strength and elongation of the brittle zone. When the alloy shrinkage stress exceeds its own strength, it causes cracks in the ingot. [0003] In the prior art, the sodium removal refining agent is generally used for sodium removal re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C21/00
CPCC22C1/026C22C1/06C22C21/00
Inventor 周强龙在华陈精智周毅苏木阳
Owner 湖北新金洋资源股份公司
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