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1.发明授权
公开(公告)号：US5545384A
公开(公告)日：1996-08-13
申请号：US465620
申请日：1995-06-05
申请人： Takuo Harato , Takahiro Ishida , Yoshio Kumagae , Michikazu Inami , Kazuhisa Ishibashi , Mitsuaki Murakami
发明人： Takuo Harato , Takahiro Ishida , Yoshio Kumagae , Michikazu Inami , Kazuhisa Ishibashi , Mitsuaki Murakami
摘要： A process for the production of aluminum hydroxide from an alumina-containing ore comprising, in a process for the production of aluminum hydroxide involving extraction of alumina from an alumina-containing ore by an aqueous alkaline solution, supplying a slurry containing the alumina-containing ore at a high solid content which is prepared from a small amount of an alkaline solution together with an aqueous alkaline solution which is so preheated to a temperature that a preheated temperature is enough high to have a temperature after the mixing with the slurry which is higher than an extraction temperature of alumina, simultaneously or after the mixing them, to an extraction apparatus comprising of a tube reactor, extracting alumina from the alumina-containing ore under extraction conditions of a temperature of 120.degree.-160.degree. C. and an extraction time within 10 minutes, separating dissolution residue from an extract solution immediately after the extraction, desilicating the extract solution, and adding seeds of aluminum hydroxide to the extract solution which is desilicated so as to precipitate aluminum hydroxide. By the production process, it is possible to economically produce aluminum hydroxide with little contamination by silica from the alumina-containing ore with a high content of the reactive silica.
摘要翻译： 一种用于从含氧化铝的矿石生产氢氧化铝的方法，包括在生产氢氧化铝的方法中涉及通过碱性水溶液从含氧化铝的矿石中提取氧化铝，提供含有含氧化铝的矿石 在高固体含量下，由少量的碱性溶液与碱性水溶液一起制备，碱水溶液如此预热至预热温度足够高以使浆料混合后的温度高于 将氧化铝的同时或混合后的提取温度提取到包括管式反应器的提取装置中，在120-116℃的提取条件下从含氧化铝的矿石中提取氧化铝，提取时间在 10分钟后，在提取后立即从提取液中分离出溶解残渣，使提取物脱硅 溶液，并将氢氧化铝的种子加入到脱液的提取液中以沉淀氢氧化铝。 通过生产过程，可以经济地生产具有高含量的反应性二氧化硅的来自含氧化铝的矿石几乎不受二氧化硅污染的氢氧化铝。
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公开(公告)号：US4737865A
公开(公告)日：1988-04-12
申请号：US925998
申请日：1986-10-31
IPC分类号： G11B15/18 , G11B27/024 , G11B27/029 , G11B27/036 , H04N5/7826 , H04N5/782 , G11B5/024 , G11B27/02
CPC分类号： G11B15/1875 , G11B27/029 , G11B2220/90 , G11B27/024
摘要： A helical scan type video tape recorder (VTR) having an editing function mode in which a new video signal can be inserted between a cut-in point and cut-out point on a previously recorded on a video tape. The VTR comprises: a rotary head drum; a rotary video head secured to the rotary head drum for recording video signals on the video tape in a plurality of skewed video tracks; a recording control circuit for supplying a recording current of the new video signal to the video head in response to a recording command signal; a rotary erase head secured to the rotary head drum for erasing a video signal recorded on selected ones of the video tracks, the rotary erase head being positioned to scan the video tracks ahead of the video head by a predetermined interval; and an erasing control circuit for supplying an erasing current, in response to the recording command signal, to the rotary erase head during the editing interval of the editing function mode except for at least one of two intervals in which the rotary erase head traces tracks at the cut-in point and the cut-out point so that the erasing current does not leak to the adjacent track in advance of the cut-in point and to the adjacent track following the cut-out point. Consequently, a fringe effect caused by the operation of the erase head is prevented from affecting other tracks outside the cut-in and cut-out point tracks.
摘要翻译： 具有编辑功能模式的螺旋扫描型录像机（VTR），其中可以在先前记录在录像带上的切入点和切出点之间插入新的视频信号。 VTR包括：旋转磁头鼓; 固定到旋转磁头鼓的旋转视频磁头，用于在多个倾斜的视频轨道中的视频磁带上记录视频信号; 记录控制电路，用于响应于记录命令信号将新的视频信号的记录电流提供给视频头; 旋转擦除头，其固定到所述旋转磁头鼓上，用于擦除记录在所选择的所述视频轨道上的视频信号，所述旋转擦除头被定位成以预定间隔扫描所述视频头前面的视频轨道; 以及擦除控制电路，用于在编辑功能模式的编辑间隔期间响应于记录命令信号将擦除电流提供给旋转擦除头，除了旋转擦除头跟踪的两个间隔中的至少一个之外 切入点和切出点，使得擦除电流在切入点之前不会泄漏到相邻轨道，并且在切出点之后到相邻轨迹。 因此，防止由擦除头的操作引起的边缘效应影响切入点和切口点轨道外的其它轨道。
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