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A kind of degassing method of recycled aluminum alloy melt

A technology of aluminum alloy melt and degassing agent, which is applied in the field of recycled metals, can solve the problems of high gas content and pore defects in the billet, so as to improve the degassing rate, realize high-value reuse, and improve the degassing effect Effect

Active Publication Date: 2021-06-01
DELTA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high gas content in the recycled aluminum alloy melt and pore defects in the billet, the present invention provides a degassing method for the recycled aluminum alloy melt, which can effectively reduce the gas impurity content of the recycled aluminum alloy, and eliminate the pores and shrinkage cavities in the billet. defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The composition of the secondary aluminum alloy melt is adjusted to 1050 aluminum alloy, and the furnace is degassed. Spray the degasser into the aluminum alloy melt with a single-hole conduit, the diameter of the conduit is 3mm, the degasser is argon + flux, the gas pressure is 0.11MPa, the gas flow rate is 1L / min, and the amount of flux added is 1.0kg / t , The flux composition is KCl: 30wt%, NaCl: 30wt%, Na 3 AlF 6 : 15wt%, Na 2 CO 3 : 15wt%, rare earth: 0.1wt%, the rest is KNO 3 , the degassing time is 60 minutes, and the pipe is evenly stirred in the melt to ensure that the aluminum alloy melt is evenly degassed. The hydrogen content of the aluminum alloy melt after degassing is 0.20ml / 100gAl.

Embodiment 2

[0028] The composition of the recycled aluminum alloy melt is adjusted to 1100 aluminum alloy composition, and the furnace is degassed. The degassing agent is sprayed into the aluminum alloy melt with a single-hole conduit, the diameter of the conduit is 6mm, the degassing agent is nitrogen + flux, the gas pressure is 0.20MPa, the gas flow rate is 6L / min, and the amount of flux added is 1.2kg / t. The flux composition is KCl: 40wt%, NaCl: 22wt%, Na3 AlF 6 : 10wt%, Na 2 CO 3 : 10wt%, rare earth: 0.2wt%, the rest is KNO 3 , the degassing time is 55 minutes, and the pipe is evenly stirred in the melt to ensure that the aluminum alloy melt is evenly degassed. The hydrogen content of the aluminum alloy melt after degassing is 0.15ml / 100gAl.

Embodiment 3

[0030] The composition of the recycled aluminum alloy melt is adjusted to the composition of 2024 aluminum alloy, and the furnace is degassed. Use a single-hole conduit to spray the degasser into the aluminum alloy melt. The diameter of the conduit is 10mm. The degasser is a mixed gas + flux, and the volume ratio of the mixed gas is Ar:Cl 2 =30:1, the gas pressure is 0.25MPa, the gas flow rate is 15L / min, the amount of flux added is 1.5kg / t, and the flux composition is KCl: 34wt%, NaCl: 26wt%, NaCl 3 AlF 6 : 12wt%, Na 2 CO 3 : 15wt%, rare earth: 0.3wt%, the rest is KNO 3 , the degassing time is 50 minutes, and the pipe is evenly stirred in the melt to ensure that the aluminum alloy melt is evenly degassed. The hydrogen content of the aluminum alloy melt after degassing is 0.12ml / 100gAl.

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PUM

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Abstract

The invention belongs to the technical field of recycled metals, and in particular relates to a degassing method for recycled aluminum alloy melts. The degassing is achieved by gas diffusion through the partial pressure difference between the degassing agent and the hydrogen in the melt, and tension adsorption on the bubble surface and oxidized inclusions. The degassing method includes one or both of in-furnace degassing and online degassing. The degassing in the furnace uses a catheter to spray the degassing agent into the aluminum alloy melt for degassing. The online degassing is box-type rotary degassing. Or trough type rotary degassing. Described degassing agent is gas or flux (comprising KCl, NaCl, NaCl 3 AlF 6 、Na 2 CO 3 、KNO 3 , rare earth), spray gas or gas + flux into the aluminum alloy melt for refining, and remove inclusions in the aluminum alloy melt by filtration, and finally obtain an aluminum alloy product with less gas content. The invention can effectively control the gas content of the aluminum alloy melt, and the hydrogen content of the aluminum alloy melt after degassing is 0.02-0.26ml / 100gAl.

Description

technical field [0001] The invention mainly belongs to the technical field of recycled metals, and in particular relates to a degassing method for recycled aluminum alloy melts. Background technique [0002] Aluminum and aluminum alloys are widely used in construction, transportation, national defense, packaging and other fields due to their low density, high specific strength, good corrosion resistance, easy processing and renewable utilization. Compared with primary aluminum, the production of 1 ton of recycled aluminum can save 95% of energy, while saving 10.05 tons of water and reducing CO emissions 2 0.8 tons, SO 2 0.6 tons, reducing red mud emissions by 3.5 tons. Therefore, secondary aluminum alloys have good economic and environmental benefits. According to statistics, the output of secondary aluminum alloy in my country has increased from 1.3 million tons in 2001 to 6.9 million tons in 2017, and the secondary aluminum industry has received more and more attention....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/06C22B9/05C22C9/10
CPCC22B9/05C22C1/026C22C1/06C22C9/10
Inventor 张深根刘波兰雪影
Owner DELTA ALUMINUM IND
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