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Title:
METHOD FOR REFINING ALUMINUM SCRAP
Document Type and Number:
Japanese Patent JP2011174165
Kind Code:
A
Abstract:

To provide a method for refining an Al scrap, by which an Al-refined body simultaneously satisfying a high removal rate of Si and a high recovery rate of an Al crystallized product from the Al scrap can be efficiently obtained, wherein composition gradient in the Al refined body is suppressed.

The refining method comprises: a first refining step comprising a primary crystal production step of producing a primary crystal 10 from a molten metal 4 of the Al scrap in a container 3 made of graphite, a pressure-applying step of separating the molten bath 4 of the Al scrap into a primary crystal aggregate 12 and an enriched liquid phase 11 and applying a first prescribed pressure thereto and a compacting plate keeping step; and a second refining step of repeating a series of steps at least once subsequently after the first refining step, thereby recovering the Al refined body, wherein the series of steps comprises a reheating step of reheating the container 3 made of graphite, thereby melting an enriched portion 11a remaining in the aggregate 12 of the primary crystal and an enriched portion discharging step of applying a second prescribed pressure to the aggregate 12 of the primary crystal by the compacting plate 6, thereby discharging the enriched portion 11a.


Inventors:
NATSUME KAZUNAGA
ISHIDA HITOSHI
MORISHITA MAKOTO
ABE MITSUHIRO
TOKUDA KENJI
Application Number:
JP2010000108402
Publication Date:
September 08, 2011
Filing Date:
May 10, 2010
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
C22B21/06; B22D27/11; C22B7/00; C22B9/02; C22C21/02
Domestic Patent References:
JPS58167733A1983-10-04
JPS5589439A1980-07-07
JP2004043972A2004-02-12
JPS58167733A1983-10-04
JPS5589439A1980-07-07
JP2004043972A2004-02-12
Foreign References:
US4456480A1984-06-26
US4456480A1984-06-26
Attorney, Agent or Firm:
Takenaka Yoshimichi
Seiji Kameoka
Hironori Takenaka
Toru Sakatani
Kaji Yoshiyuki
Makoto Suhara