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Machine translation
1. (WO1998029575) METHOD FOR VACUUM/REDUCED-PRESSURE REFINING AND FACILITY FOR VACUUM/REDUCED-PRESSURE REFINING
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1998/029575    International Application No.:    PCT/JP1997/004823
Publication Date: 09.07.1998 International Filing Date: 25.12.1997
IPC:
C21C 5/28 (2006.01), C21C 7/10 (2006.01)
Applicants: NIPPON STEEL CORPORATION [JP/JP]; 6-3, Otemachi 2-chome, Chiyoda-ku, Tokyo 100 (JP) (For All Designated States Except US).
SHIMOMURA, Kensuke [JP/JP]; (JP) (For US Only).
SADACHIKA, Masaru [JP/JP]; (JP) (For US Only).
TAKANO, Hironori [JP/JP]; (JP) (For US Only).
OGAWA, Gaku [JP/JP]; (JP) (For US Only).
ABE, Kenji [JP/JP]; (JP) (For US Only).
OKIMORI, Mayumi [JP/JP]; (JP) (For US Only).
MAKINO, Nobuyuki [JP/JP]; (JP) (For US Only).
IWASAKI, Hiroshi [JP/JP]; (JP) (For US Only).
TANAKA, Tomoaki [JP/JP]; (JP) (For US Only).
MORISHIGE, Hiroaki [JP/JP]; (JP) (For US Only)
Inventors: SHIMOMURA, Kensuke; (JP).
SADACHIKA, Masaru; (JP).
TAKANO, Hironori; (JP).
OGAWA, Gaku; (JP).
ABE, Kenji; (JP).
OKIMORI, Mayumi; (JP).
MAKINO, Nobuyuki; (JP).
IWASAKI, Hiroshi; (JP).
TANAKA, Tomoaki; (JP).
MORISHIGE, Hiroaki; (JP)
Agent: AKIZAWA, Masamitsu; Akizawa Patent Office, Taiyo Building, 12-1, Nihonba-shi kabuto-cho, Chuo-ku, Tokyo 103 (JP)
Priority Data:
8/355888 25.12.1996 JP
9/20924 21.01.1997 JP
9/38541 07.02.1997 JP
9/38542 07.02.1997 JP
Title (EN) METHOD FOR VACUUM/REDUCED-PRESSURE REFINING AND FACILITY FOR VACUUM/REDUCED-PRESSURE REFINING
(FR) PROCEDE D'AFFINAGE PAR LE VIDE/SOUS PRESSION REDUITE ET INSTALLATION POUR LEDIT AFFINAGE
Abstract: front page image
(EN)Problem: dust collection in a vacuum/reduced-pressure refining process is conducted using an inexpensive filter without causing damage on and burn of the filter. Solving means: a vacuum/reduced-pressure refining vessel (1), a dry type dust collector (3) using a filter (2) and a reduced-pressure exhaust device (4) are connected sequentially by an upstream-side duct (5) and a downstream-side duct (6), and a gate valve (7) is provided to the upstream-side duct (5). At the time of starting the vaccum/reduced-pressure refining process, non-oxidizing gas is fed into the upstream side of the gate valve (7) and oxygen on the upstream side is replaced thereby substantially. Thereafter, the upstream side is closed gastightly, the gate valve (7) is opened after the closed state on the upstream side is accomplished, and the dust collector (3) is operated. It is preferable that after the vacuum/reduced-pressure refining process the gate valve (7) is closed, only the non-oxidizing gas is fed into the upstream side of the valve to recover the pressure, and then the vessel is opened to the atmosphere, and it is also preferable that after the vacuum/reduced-pressure refining process, an opening part on the duct collector (3) side is closed during the standby till the subsequent vacuum/reduced-pressure refining process is started.
(FR)Problème: dans un procédé d'affinage par le vide/sous pression réduite, on collecte les poussières au moyen d'un filtre bon marché, sans endommager ni brûler celui-ci. Solution: une cuve d'affinage (1) par le vide/sous pression réduite, un séparateur de poussières (3) de type à sec utilisant un filtre (2) et un dispositif d'évacuation sous pression réduite (4) sont connectés successivement par une conduite d'amont (5) et par une conduite d'aval (6), et un robinet-vanne (7) est disposé sur la conduite d'amont (5). Au moment de lancer le processus d'affinage, on amène en amont du robinet-vanne (7) un gaz non oxydant qui remplace sensiblement l'oxygène. Puis on ferme le côté amont hermétiquement aux gaz, on ouvre le robinet-vanne une fois que le côté amont est fermé et on met en marche le séparateur de poussières (3). De préférence, après le processus d'affinage, on ferme le robinet-vanne (7), on amène le gaz non oxydant uniquement en amont dudit robinet-vanne, de façon à récupérer la pression, puis on ouvre la cuve vers l'atmosphère et on ferme un élément d'ouverture situé sur le séparateur (3) de la conduite en attendant le début du processus d'affinage suivant.
Designated States: CN, KR, US.
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)