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Sodium-free flux and process for treatment of molten aluminum alloy with the same

A technology of aluminum alloy and molten metal, which is applied in the field of molten aluminum treatment by injecting flux into a rotary degassing device to achieve uniform dispersion, high slag removal effect, and maintenance of slag removal effect.

Inactive Publication Date: 2008-01-30
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the inventor has found out through experiments that if the molten metal is treated with a non-sodium flux by using a flux injection rotary degassing device, the main component of the flux, KCl, will not be converted into molten salt when it is ejected from the nozzle near the rotating rotor. Rather, it is a problem of unreacted flux adhesion and deposition near the nozzle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] 〔Evaluation test of flux adhesion and deposition〕

[0044] Using fluxes within and outside the composition range of the present invention to process molten aluminum alloys through flux injection into a rotary degasser to evaluate the adhesion and deposition of flux at the bottom of the rotor.

[0045] The components of the fluxes used are shown in Table 1. Fluxes A and B are inventive examples with components within the scope of the present invention, and fluxes C to I are comparative examples with components outside the scope of the present invention.

[0046] The composition (mass %) of each flux of table 1

[0047] Flux

KALF 4

AlF 3

KCl

K 2 SO 4

MgCl 2

Invention example

A

-

80

10

10

-

B

-

90

5

5

-

comparative example

C

100

-

-

-

-

D

70

...

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PUM

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Abstract

The invention provides a non-sodium-based flux that prevents unreacted flux from adhering and depositing when the flux is injected into a rotary degassing device, thereby ensuring a high slag removal effect, and a non-sodium-based flux for processing molten aluminum alloys and its treatment Method of melting aluminum alloys. The non-sodium flux contains, by mass percentage: AlF3: 80-95%, KCl: 2.5-10%, K2SO4: 2.5-10% as essential components, and the rest are other chlorides, fluorides and nitrates. A method for processing molten aluminum, comprising: maintaining the above-mentioned rotating rotor immersed in the above-mentioned molten aluminum alloy; injecting inert gas and flux into the molten metal from the above-mentioned nozzle, and rotating the rotor at a speed of 200-450rmp to make the molten metal The inclusions in the molten metal float together with the fine bubbles and flux to the surface of the molten metal to achieve degassing and slag removal.

Description

technical field [0001] The invention relates to a method for processing molten aluminum, in particular to a method for processing molten aluminum by injecting flux into a rotary degassing device. Background technique [0002] Conventionally, Na has been used as a eutectic Si modifier for casting alloys. As a flux to which Na is added, a sodium-based flux containing NaF and NaCl as main components is widely used. [0003] However, although Na generally has the effect of promoting the dispersion of pores in aluminum castings, although it varies depending on the alloy composition and casting scheme, due to the reaction with moisture in the air, even if only a few PPM of Na is contained in the molten metal, It is also easy to form a higher hydrogen concentration, which promotes the oxidation of the molten metal surface and the formation of slag. Furthermore, in the 5000-series aluminum alloy containing Mg as the main alloy component, a trace amount of Na causes grain boundary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/10C22B9/05C22B21/06F27D27/00
CPCC22B9/103C22B21/062C22B21/064C22B9/05
Inventor 仓增幸雄小泽正幸
Owner NIPPON LIGHT METAL CO LTD
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