Interior purification technology for molten aluminum smelter

A melting furnace technology technology, applied in the field of purification of molten aluminum melting furnace, can solve problems such as incomplete degassing and slag removal, loose aluminum alloy ingots, and lower product qualification rate, so as to reduce looseness, improve cleanliness, and improve product quality Effect

Inactive Publication Date: 2013-08-21
SHANDONG INNOVATION METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the aluminum alloy casting process, usually through the process steps of feeding-refining-slag removal-standstill-casting, the quality of the final aluminum alloy product depends on the gas content and impurity content in the aluminum alloy as well as the grain size. The process is to remove impurities such as gas and iron in the molten aluminum, and to purify the molten aluminum, which occupies an important position in the production process of aluminum alloys. The existing technology uses one-time refining. The refining process control and the selection of refining agents are of great importance. The removal of impurities is particularly critical, and incomplete degassing and slag removal will often lead to looseness and slag inclusion defects in aluminum alloy ingots, and the product qualification rate will decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0015] The purification technology in the molten aluminum melting furnace includes two refining and three slag removal technologies, wherein a refining agent is added in the refining process. The refining process adopts powder spraying refining in the furnace, using a powder spraying machine to spray the refining agent into the molten aluminum in the furnace, and at the same time, argon gas is introduced for degassing.

[0016] The specific process is slag removal-refining-slag removal-refining-slag removal. The first refining is to adjust the temperature at 700 degrees, add refining agent, and react for 20 minutes; the second refining is to adjust the temperature to 750 degrees, add refining agent, reacted for 15 minutes.

[0017] The refining agent consists of the following components by weight: NaCl: 28%, KCl: 28%, CaF 2 :3%, Na 2 SO 4 :3%, Na 3 AlF 6 :38%.

[0018] This purification technology improves the cleanliness of the electrolytic aluminum liquid, making the h...

Embodiment 2

[0020] The purification technology in the molten aluminum melting furnace includes two refining and three slag removal technologies, wherein a refining agent is added in the refining process. The refining process adopts powder spraying refining in the furnace, using a powder spraying machine to spray the refining agent into the molten aluminum in the furnace, and at the same time, argon gas is introduced for degassing.

[0021] The specific process is slag removal - refining - slag removal - refining - slag removal. The first refining is to adjust the temperature at 690 degrees, add refining agent, and react for 25 minutes; the second refining is to adjust the temperature to 780 degrees, add refining agent, reacted for 12 minutes.

[0022] The refining agent consists of the following components by weight: NaCl: 42%, KCl: 25%, CaF 2 :1%, Na 2 SO 4 :5%, Na 3 AlF 6 :27%.

[0023] This purification technology improves the cleanliness of the electrolytic aluminum liquid, maki...

Embodiment 3

[0025] The purification technology in the molten aluminum melting furnace includes two refining and three slag removal technologies, wherein a refining agent is added in the refining process. The refining process adopts powder spraying refining in the furnace, using a powder spraying machine to spray the refining agent into the molten aluminum in the furnace, and at the same time, argon gas is introduced for degassing.

[0026] The specific process is slag removal-refining-slag removal-refining-slag removal. The first refining is to adjust the temperature at 650 degrees, add refining agent, and react for 30 minutes; the second refining is to adjust the temperature to 720 degrees and add refining agent, reacted for 20 minutes.

[0027] The refining agent consists of the following components by weight: NaCl: 30%, KCl: 26%, CaF 2 :5%, Na 2 SO 4 :2%, Na 3 AlF 6 : 37%.

[0028] This purification technology improves the cleanliness of the electrolytic aluminum liquid, making t...

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PUM

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Abstract

The invention provides an interior purification technology for a molten aluminum smelter. The interior purification technology comprises two times of refining and three times of drossing, wherein before refining, a refining agent is added, in the refining process, powder is sprayed in the smelter to be refined, the refining agent is sprayed into molten aluminum in the smelter by a powder blower, and argon is aerated for degassing. According to the interior purification technology, the cleanliness of electrolytic molten aluminum is improved, the hydrogen content of the processed molten aluminum is lower than 0.125ml/100gAl, the deslagging ratio reaches above 85%, the problems of looseness and slag inclusion caused by aluminum alloy ingot casting are solved, and the product percent of pass is greatly increased.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a purification technology in a molten aluminum melting furnace. Background technique [0002] In the aluminum alloy casting process, usually through the process steps of feeding-refining-slag removal-standstill-casting, the quality of the final aluminum alloy product depends on the gas content and impurity content in the aluminum alloy as well as the grain size. The process is to remove impurities such as gas and iron in the molten aluminum, and to purify the molten aluminum, which occupies an important position in the production process of aluminum alloys. The existing technology uses one-time refining. The refining process control and the selection of refining agents are of great importance. The removal of impurities is particularly critical, and incomplete degassing and slag removal will often lead to loose aluminum alloy ingots, slag inclusion defects, and lowe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06
Inventor 崔立新赵晓光刘科吕涛
Owner SHANDONG INNOVATION METAL TECH
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