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Method for recycling scrap containing aluminium-lithium-type alloys

A technology of aluminum alloy and scrap, applied in chemical instruments and methods, metallurgical equipment, improvement of process efficiency, etc., can solve problems such as restricting economic development and affecting the overall economy of Al-Li alloys.

Active Publication Date: 2008-08-06
CONSTELLIUM ISSOIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This severely affects the overall economics of Al-Li alloys and hampers their economic development

Method used

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  • Method for recycling scrap containing aluminium-lithium-type alloys
  • Method for recycling scrap containing aluminium-lithium-type alloys

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Experimental program
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Effect test

Embodiment 1

[0066] 2 tons of Alloy 2098 milling chips ("scrap") were introduced into IDEX through a screw feeder  Furnace to degrease. The density of this waste is 0.3t / m 3 . A magnetic sensor was used at the entrance to the furnace to minimize occasional magnetic contamination.

[0067] In an induction furnace with a capacity of 6 tons (frequency of supply current: 70 Hz), a bed of liquid metal was prepared from 3 tons of bulk scrap of alloy 2098 (for other similar melting tests and continuous casting operations, before using The residue of the casting acts as a bed of liquid metal ("residue metal")). The temperature of the liquid metal bed is adjusted to between 700 and 780°C. Then 2 tons of waste were added at a flow rate of 6 tons / hour. Obtain a floating layer with a static thickness of 800mm. Argon was added during this loading step for some experiments. The conditions for all experiments are summarized in Table 1. When the waste was fully loaded, the surface of the liquid m...

Embodiment 2

[0078] In order to better understand the protective effect of the floating layer above the liquid metal in the present invention, the oxygen content in the floating layer was measured by sensors and special devices. Figure 2 schematically illustrates the method used. A gas sampling rod (14) is inserted into the floating layer (3) to a predetermined depth (15). After insertion, the oxygen content is measured at a predetermined time (t1) by means of a gas analyzer (16). This time after insertion may affect the results of the measurements, since the insertion of the rod into the slick will locally disturb the composition of the atmosphere. The results obtained are given in Table 3. It should be noted that an effect on the oxygen content was observed when the rod was inserted to a depth of 50 mm. For an insertion depth of 120 cm and 7 min after insertion, the oxygen content can reach less than one-third of the original. These measurements show the effect of the floating layer ...

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Abstract

The present invention is directed to a method for melting scrap of an aluminum alloy containing lithium. The steps include providing scrap containing aluminum-lithium-type alloys, preparing an initial liquid metal bed of a first composition in a smelting oven, loading the scrap onto the initial liquid metal bed so as to create a floating layer of the scrap with a controlled thickness at the surface of the liquid metal bed, partially melting the floating layer via contact with the metal bed so as to obtain a liquid metal bath having a second composition, and removing the liquid metal from the second composition of the liquid metal bath. The method has technical and economic advantages. It does not require investment in a particular installation and it requires minimal use of expensive expendable materials such as inert gas, because the formation of a floating layer having a controlled thickness makes it possible to effectively protect the surface of the liquid metal from oxidation.

Description

technical field [0001] The present invention relates to the production of lithium-containing aluminum alloy remelt ingots from scrap (recycled raw material, such as machining offcuts or chips). In particular, the invention relates to the recycling of waste materials formed by manufacturing processes in the aviation and space industry. Background technique [0002] In many industries, the methods of manufacturing finished metal products through processes such as machining, deforming and cutting intermediate products generate large amounts of machining scrap and scrap. In this specification these wastes are denoted by the term "scrap" which is specified in the standard EN 12258-3 entitled "Aluminum and aluminum alloys - Terms and definitions - Part 3: Scrap (raw materials for recycling)" The middle finger refers to the product (aluminum) used for recycling. The aviation and aerospace industry in particular generates large amounts of scrap, since many aircraft components and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22C21/00
CPCC22B21/0069C22B21/0092C22B21/06C22C21/00C22C1/026Y10S266/901Y02P10/20
Inventor J-P·瑞奎特P·佩尔马德J-F·维黛尔
Owner CONSTELLIUM ISSOIRE
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