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Degassing method for regenerated aluminum alloy melt

A technology of aluminum alloy melt and degassing agent, applied in the field of recycled metal, can solve the problems of porosity defects and high gas content in billets, and achieve the effects of realizing high-value reuse, improving degassing rate and realizing separation.

Active Publication Date: 2019-01-04
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 recycled 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 secondary aluminum alloy melt is adjusted to 1100 aluminum alloy composition, 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 6mm. The degasser 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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Abstract

The invention belongs to the technical field of secondary metals, and in particular relates to a degassing method of a regenerated aluminum alloy melt. Gas diffusion and tension adsorption between bubble surfaces and oxide inclusions are realized through a hydrogen partial pressure difference between a degassing agent and a melt to realize degassing. The degassing method comprises one or two of in-furnace degassing and on-line degassing, wherein the in-furnace degassing adopts a conduit to inject the degassing agent into the aluminum alloy melt for degassing, and the on-line degassing is box-type rotary degassing or runner-type rotary degassing. The degassing agent is a gas or fusing agent (containing KCl, NaCl, Na3AlF6, Na2CO3, KNO3 and rare earth), the gas or gas+fusing agent is sprayedinto the aluminum alloy melt for refining, and impurities in the aluminum alloy melt are removed by a filtration method to finally obtain an aluminum alloy product with low gas content. The degassingmethod provided by the invention can effectively control the gas content of the aluminum alloy melt, and the hydrogen content of the degassed aluminum alloy melt 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 Applications(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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