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1. 发明申请

WO1998029575A1 METHOD FOR VACUUM/REDUCED-PRESSURE REFINING AND FACILITY FOR VACUUM/REDUCED-PRESSURE REFINING 审中-公开
标题翻译：用于真空/降低压力精炼的真空/降低压力精炼方法
公开(公告)号：WO1998029575A1
公开(公告)日：1998-07-09
申请号：PCT/JP1997004823
申请日：1997-12-25
申请人： NIPPON STEEL CORPORATION , SHIMOMURA, Kensuke , SADACHIKA, Masaru , TAKANO, Hironori , OGAWA, Gaku , ABE, Kenji , OKIMORI, Mayumi , MAKINO, Nobuyuki , IWASAKI, Hiroshi , TANAKA, Tomoaki , MORISHIGE, Hiroaki
发明人： NIPPON STEEL CORPORATION
IPC分类号： C21C07/10
CPC分类号： C21C7/10 , C21C5/28
摘要： 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.
摘要翻译：问题：使用便宜的过滤器进行真空/减压精炼过程中的灰尘收集，而不会损坏和燃烧过滤器。解决方法：使用过滤器（2）和减压排气装置（4）的真空/减压精炼容器（1），干式集尘器（3），依次由上游侧管道（5））和下游侧管道（6），并且闸门（7）设置在上游侧管道（5）上。在开始真空/减压精炼过程时，非氧化性气体被进料到闸阀（7）的上游侧，并且上游侧的氧气基本上被替换。此后，上游侧气密地关闭，在上游侧的关闭状态完成之后，闸阀（7）打开，并且集尘器（3）被操作。优选的是，在真空/减压精炼处理之后，闸阀（7）关闭，只有非氧化气体被供给到阀的上游侧以回收压力，然后将容器打开至气氛中，优选在真空/减压精制处理之后，在待机状态下，在收集器（3）侧的开口部分被关闭，直到开始后续的真空/减压精制处理。

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