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Sodium removal refining technology

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

Inactive Publication Date: 2018-09-11
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, and the aluminum alloy begins to melt when the temperature rises to 600°C, and a melt is obtained after the aluminum alloy is completely melted.

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

[0026] S2': Add 10kg of ammonium acrylate and 0.8kg of initiator ammonium persulfate to the melt, and fully stir the melt to make the sodium element in the melt fully contact with ammonium acrylate. Under the conditi...

Embodiment 2

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

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

[0034] S2': Add 8kg of ammonium acrylate and 0.5kg of initiator ammonium persulfate to the melt, and fully stir the melt to make the sodium element in the melt fully contact with ammonium acrylate. Under the conditio...

Embodiment 3

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

[0041] S2: Continue to heat the furnace with the furnace door open, so that the temperature of the melt in the furnace is raised to 725°C, and the temperature is controlled to be stable and maintained for 8 minutes, so that the sodium element in the melt is fully reacted. Compared with other metal elements, sodium element is more active and easy to oxidize. When the melt in the furnace is heated and burned, the sodium element contacts with the oxygen in the air to produce oxidized scum, which can reduce part of the sodium element in the aluminum alloy.

[0042] S2': Add 10kg of ammonium acrylate and 0.5kg of initiator ammonium persulfate to the melt, and fully stir the melt to make the sodium element in the melt fully contact with ammonium acrylate. Und...

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Abstract

The invention relates to the technical field of aluminum alloy refining, and especially relates to a sodium removal refining 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 thetemperature 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, the sodium element reacts with nitrogen under closed high-temperature conditions to generatesodium azide dross in order to make the sodium 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 refining process for removing sodium. Background technique [0002] Sodium is one of the trace elements in the aluminum melt. Although its content is very small, it has a great influence on the casting properties of aluminum alloys, especially the hot cracking of aluminum alloy ingots with high magnesium content and cracking during hot rolling. 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, generally in the aluminum melt refining, a sodium-removing refining agent is used ...

Claims

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Application Information

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IPC IPC(8): C22B21/06C22B9/05C22B9/10
Inventor 黎基发周毅周强苏木阳
Owner 湖北新金洋资源股份公司
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