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 processing molten aluminum 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: 2009-12-02
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment

[0042] 〔Evaluation test of flux adhesion and deposition〕

[0043] 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 flux adhesion and deposition at the bottom of the rotor.

[0044] 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.

[0045] The composition (mass %) of each flux of table 1

[0046]

[0047] 230 kg of molten AC4C alloy was placed in a holding furnace at 740 °C. In this state, the molten metal was processed by injecting the rotary degasser with a flux rotating in one direction at a speed of 300 rpm. In the first stage, a flux of a predetermined composition at a feed rate of 40 g / min and nitrogen at a flow rate of 30 L / min were simultane...

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Abstract

The invention provides a sodium-free flux which is to be used in treating a molten aluminum alloy in a rotary flux injection / degassing apparatus and which can inhibit the adhesion and build-up of unreacted flux and attain high deslaging effect; and a process for treatment of a molted aluminum alloy with the flux, more specifically, a sodium-free flux which consists by mass of 80 to 95 % AlF3, 2.5 to 10% KCl, and 2.5 to 10 % K2SO4 as the essential components and at most 5 % total of other chlorides, fluorides and nitrates as the balance component; and a process for treatment of an aluminum alloy which comprises keeping the rotor of the above apparatus in a state immersed in a molten aluminum alloy, injecting an inert gas and the above flux into the molten aluminum alloy from nozzles, and rotating the rotor at 200 to 450 rpm to thereby make inclusions contained in the molten alloy float up to the surface of the molten alloy together with fine bubbles and the flux and thus carry out degassing and deslaging.

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 Patents(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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