JP5923925B2 - 鉄粉の仕上熱処理方法および仕上熱処理装置 - Google Patents
鉄粉の仕上熱処理方法および仕上熱処理装置 Download PDFInfo
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- JP5923925B2 JP5923925B2 JP2011231474A JP2011231474A JP5923925B2 JP 5923925 B2 JP5923925 B2 JP 5923925B2 JP 2011231474 A JP2011231474 A JP 2011231474A JP 2011231474 A JP2011231474 A JP 2011231474A JP 5923925 B2 JP5923925 B2 JP 5923925B2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/045—Furnaces with controlled atmosphere
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/08—Extraction of nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/028—Multi-chamber type furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/045—Furnaces with controlled atmosphere
- F27B9/047—Furnaces with controlled atmosphere the atmosphere consisting of protective gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/243—Endless-strand conveyor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/01—Reducing atmosphere
- B22F2201/013—Hydrogen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/10—Inert gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/32—Decarburising atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/35—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- General Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Powder Metallurgy (AREA)
- Tunnel Furnaces (AREA)
Description
例えば、特許文献1には、原料鉄粉を主として水素からなる雰囲気ガス中で連続熱処理するにあたり、熱処理雰囲気温度を800〜950℃に保持し、熱処理の前半は水分を6容量%以上含有する脱炭雰囲気とし、後半は水分を4容量%以下含有する還元雰囲気として、還元鉄粉を得る、原料鉄粉の熱処理方法が記載されている。
脱窒ゾーン4では、ラジアントチューブ11により雰囲気温度を450〜750℃に制御し、この脱窒ゾーン4の下流側に設けられた雰囲気ガス導入口5から反応ガスである水素ガス(露点:40℃以下)を導入して、粗製粉から脱窒するとしている。
C(in Fe)+ FeO(s) = Fe(s)+ CO(g)
が生じ、粗製鉄粉中のC,Oが低減できることを見出した。さらに、450〜750℃の温度域で加熱し、雰囲気ガスを水素ガスとすれば、脱窒反応も生じるため、脱窒も可能となることに思い至った。したがって、脱窒を想定しない場合には、雰囲気は不活性ガスとしてもよいことになる。
(1)粗製鉄粉を連続式移動床に載置して、該粗製鉄粉に、脱炭、脱酸、脱窒のうちの少なくとも2種の処理を連続的に施して、製品鉄粉とするにあたり、前記少なくとも2種の処理の前に、予め前記粗製鉄粉に、水素ガスおよび/または不活性ガス雰囲気中で、雰囲気温度で700〜1100℃の温度域で加熱する予備処理を施すことを特徴とする鉄粉の仕上熱処理方法。
(2)(1)において、前記予備処理で、雰囲気ガスとして導入する水素ガスおよび/または不活性ガスは、前記少なくとも2種の処理で使用する雰囲気ガスとは別に、前記連続式移動床の移動方向と同一方向の流れとなるように、前記予備処理を行う領域の上流側から導入し、下流側から排出することを特徴とする鉄粉の仕上熱処理方法。
つぎに、本発明の鉄粉の仕上熱処理方法について説明する。
本発明の鉄粉の仕上熱処理方法では、出発素材は、ミルスケールを粗還元した粗還元鉄粉やアトマイズしたままの粗鉄粉などの粗製鉄粉とする。
C(in Fe)+ FeO(s) = Fe(s)+ CO(g)
にしたがい、粗製鉄粉中の脱炭、脱酸を行うことができる。この反応は、700℃以上の温度域に加熱すればよく、雰囲気ガスを不活性ガスとしても水素ガスとしても生じる。なお、この予備処理では、加熱中に450〜750℃の温度領域を通過するため、雰囲気ガスを水素ガスとすれば、次のような反応
N(in Fe)+ 3/2 H2(g) = NH3(g)
にしたがって、粗製鉄粉の脱窒も行うことができる。したがって、脱窒を想定する場合には、雰囲気ガスは水素ガスとする必要がある。
脱炭ゾーン2においては、ラジアントチューブ11により雰囲気温度を600〜1100℃に制御し、下流側の脱酸ゾーン3から仕切壁1の開口部を介して送られる、水素ガス等を主体とする還元性ガス(水素ガス)に、水蒸気吹込み口12から導入された水蒸気(H2Oガス)を加えて、露点を30〜60℃に調整して、粗製鉄粉の脱炭処理を行う。脱炭ゾーン2では、下記反応
C(in Fe)+ H2O(g) = CO(g)+ H2(g)
にしたがって、粗製鉄粉の脱炭が行われる。
FeO (s)+ H2(g)= Fe(s)+ H2O(g)
にしたがって、脱酸が行われる。
N(in Fe)+ 3/2 H2(g) = NH3(g)
にしたがって、脱窒が行われる。
これら粗製鉄粉を、ホッパー8から払い出して、連続移動床であるベルト9上に、厚さ:40mmで載置し、予備処理ゾーン31における予備処理と、脱炭ゾーン2における脱炭処理、脱酸ゾーン3における脱酸処理、脱窒ゾーン4における脱窒処理からなる仕上熱処理を連続的に行い、本発明例とした。各ゾーンにおける、処理温度、導入ガスの種類および流量、装入量を、表1に併記する。なお、脱炭ゾーン2、脱酸ゾーン3、脱窒ゾーン4における雰囲気ガスは、脱窒ゾーン4の下流側に配設された雰囲気ガス導入口5から導入され、ベルト9の移動方向と向流になるように、各ゾーンの仕切壁の開口部を通じるガス流路を介して各ゾーンに供給される。なお、予備処理ゾーン31を用いない場合を、比較例とした。
2 脱炭ゾーン
3 脱酸ゾーン
4 脱窒ゾーン
5 雰囲気ガス導入口
6 雰囲気ガス排出口
7 粗製鉄粉
8 ホッパ
9 ベルト(連続移動床)
10 ホイール
11 ラジアントチューブ
12 水蒸気吹込み口
14 タンク
15 水封槽
20 粉砕装置
21 冷却器
22 循環ファン
30 炉体
31 予備処理空間(予備処理ゾーン)
50 予備処理用雰囲気ガス導入口
71 製品鉄粉
Claims (2)
- 粗製鉄粉を連続式移動床に載置して、該粗製鉄粉に、脱炭、脱酸、脱窒のうちの少なくとも2種の処理を連続的に施して、製品鉄粉とするにあたり、前記少なくとも2種の処理の前に、予め前記粗製鉄粉に、水素ガスおよび/または不活性ガス雰囲気中で、雰囲気温度で700〜1100℃の温度域で加熱する予備処理を施すことを特徴とする鉄粉の仕上熱処理方法。
- 前記予備処理で、雰囲気ガスとして導入する水素ガスおよび/または不活性ガスは、前記少なくとも2種の処理で使用する雰囲気ガスとは別に、前記連続式移動床の移動方向と同一方向の流れとなるように、前記予備処理を行う領域の上流側から導入し、下流側から排出することを特徴とする請求項1に記載の鉄粉の仕上熱処理方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2011231474A JP5923925B2 (ja) | 2011-03-23 | 2011-10-21 | 鉄粉の仕上熱処理方法および仕上熱処理装置 |
EP11861736.4A EP2689871B1 (en) | 2011-03-23 | 2011-12-15 | Method of finish heat treatment of iron powder and apparatus for finish heat treatment |
US13/984,409 US9321103B2 (en) | 2011-03-23 | 2011-12-15 | Finish heat treatment method and finish heat treatment apparatus for iron powder |
CA2827907A CA2827907C (en) | 2011-03-23 | 2011-12-15 | Finish heat treatment method and finish heat treatment apparatus for iron powder |
PCT/JP2011/079751 WO2012127760A1 (ja) | 2011-03-23 | 2011-12-15 | 鉄粉の仕上熱処理方法および仕上熱処理装置 |
US14/987,117 US9815115B2 (en) | 2011-03-23 | 2016-01-04 | Finish heat treatment method and finish heat treatment apparatus for iron powder |
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JP2011064059 | 2011-03-23 | ||
JP2011064059 | 2011-03-23 | ||
JP2011231474A JP5923925B2 (ja) | 2011-03-23 | 2011-10-21 | 鉄粉の仕上熱処理方法および仕上熱処理装置 |
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JP2012211383A JP2012211383A (ja) | 2012-11-01 |
JP5923925B2 true JP5923925B2 (ja) | 2016-05-25 |
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US (2) | US9321103B2 (ja) |
EP (1) | EP2689871B1 (ja) |
JP (1) | JP5923925B2 (ja) |
CA (1) | CA2827907C (ja) |
WO (1) | WO2012127760A1 (ja) |
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JP5923925B2 (ja) * | 2011-03-23 | 2016-05-25 | Jfeスチール株式会社 | 鉄粉の仕上熱処理方法および仕上熱処理装置 |
CN105121069A (zh) | 2013-04-19 | 2015-12-02 | 杰富意钢铁株式会社 | 压粉磁芯用铁粉以及压粉磁芯用绝缘包覆铁粉 |
CN111526623B (zh) * | 2019-02-01 | 2022-05-31 | 株洲弗拉德科技有限公司 | 一种卧式连续微波加热粉体设备、加热方法 |
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JPS58482B2 (ja) | 1976-06-23 | 1983-01-06 | 川崎製鉄株式会社 | 原料鉄粉の熱処理方法 |
JPS61110701A (ja) | 1984-11-01 | 1986-05-29 | Kawasaki Steel Corp | 鉄鋼粉の仕上熱処理方法及びその装置 |
JPS6440881A (en) | 1987-08-07 | 1989-02-13 | Canon Kk | Hologram having protective layer |
JPH049402A (ja) * | 1990-04-26 | 1992-01-14 | Kawasaki Steel Corp | 金属粉末の還元焼鈍方法 |
JP2006009138A (ja) * | 2004-05-27 | 2006-01-12 | Jfe Steel Kk | 鉄粉の仕上熱処理方法および装置 |
JP4839869B2 (ja) * | 2006-02-10 | 2011-12-21 | Jfeスチール株式会社 | 鉄粉の仕上熱処理方法および仕上熱処理装置 |
JP2010159474A (ja) * | 2009-01-09 | 2010-07-22 | Jfe Steel Corp | 鉄粉の仕上げ熱処理方法および装置 |
JP5923925B2 (ja) * | 2011-03-23 | 2016-05-25 | Jfeスチール株式会社 | 鉄粉の仕上熱処理方法および仕上熱処理装置 |
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2011
- 2011-10-21 JP JP2011231474A patent/JP5923925B2/ja not_active Expired - Fee Related
- 2011-12-15 EP EP11861736.4A patent/EP2689871B1/en not_active Not-in-force
- 2011-12-15 CA CA2827907A patent/CA2827907C/en not_active Expired - Fee Related
- 2011-12-15 US US13/984,409 patent/US9321103B2/en not_active Expired - Fee Related
- 2011-12-15 WO PCT/JP2011/079751 patent/WO2012127760A1/ja active Application Filing
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2016
- 2016-01-04 US US14/987,117 patent/US9815115B2/en active Active
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Publication number | Publication date |
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CA2827907A1 (en) | 2012-09-27 |
US20160114391A1 (en) | 2016-04-28 |
WO2012127760A1 (ja) | 2012-09-27 |
EP2689871A4 (en) | 2014-10-22 |
JP2012211383A (ja) | 2012-11-01 |
US9815115B2 (en) | 2017-11-14 |
US9321103B2 (en) | 2016-04-26 |
EP2689871B1 (en) | 2018-10-17 |
CA2827907C (en) | 2016-03-29 |
US20140048184A1 (en) | 2014-02-20 |
EP2689871A1 (en) | 2014-01-29 |
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