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Title:
METHOD OF FINISH HEAT TREATMENT OF IRON POWDER AND APPARATUS FOR FINISH HEAT TREATMENT
Document Type and Number:
WIPO Patent Application WO/2012/127760
Kind Code:
A1
Abstract:
A method and an apparatus for finish heat treatment of an iron powder are provided, with which it is possible to produce, with high productivity, an iron powder product having impurity concentrations within objective ranges regardless of the impurity concentrations of the crude iron powder. The method comprises: placing a crude iron powder on a continuous moving bed to continuously introduce the crude iron powder into the apparatus for finish heat treatment; firstly subjecting the crude iron powder in a pretreatment zone to a pretreatment in which the powder is heated to a temperature in the range of 450-1,100ºC in a hydrogen gas and/or inert gas atmosphere; and then subjecting the pretreated powder to at least two of decarburization, deoxidation, and denitrification treatments in a decarburization zone, a deoxidation zone, and a denitrification zone. In the pretreatment zone, hydrogen gas and/or an inert gas is introduced as an ambient gas, separately from the ambient gas for use in the at least two treatments, into the upstream-side part of the pretreatment zone and discharged from the downstream-side part thereof so that the ambient gas flows in the same direction as the moving direction of the continuous moving bed.

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Inventors:
SAKAGUCHI YASUHIKO (JP)
MAETANI TOSHIO (JP)
Application Number:
PCT/JP2011/079751
Publication Date:
September 27, 2012
Filing Date:
December 15, 2011
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
SAKAGUCHI YASUHIKO (JP)
MAETANI TOSHIO (JP)
International Classes:
B22F1/00; B22F1/14; B22F1/142; B22F1/145; F27B9/04
Foreign References:
JP2010159474A2010-07-22
JP2007211302A2007-08-23
JP2006009138A2006-01-12
JPH049402A1992-01-14
JPS52156714A1977-12-27
JPH0140881B21989-09-01
Other References:
See also references of EP 2689871A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
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