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公开(公告)号:EP0391388B1
公开(公告)日:1994-06-29
申请号:EP90106432.9
申请日:1990-04-04
发明人: Kimura, Kiichi c/o Showa Denko K.K. , Kaji, Hiroaki c/o Showa Denko K.K. , Okazaki, Kenichi c/o Showa Denko K.K.
IPC分类号: C01G49/06
CPC分类号: G11B5/70663 , C01G49/06 , C01P2004/04 , C01P2004/10 , C01P2006/12
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2.
公开(公告)号:EP0391388A1
公开(公告)日:1990-10-10
申请号:EP90106432.9
申请日:1990-04-04
发明人: Kimura, Kiichi c/o Showa Denko K.K. , Kaji, Hiroaki c/o Showa Denko K.K. , Okazaki, Kenichi c/o Showa Denko K.K.
IPC分类号: C01G49/06
CPC分类号: G11B5/70663 , C01G49/06 , C01P2004/04 , C01P2004/10 , C01P2006/12
摘要: Disclosed is a process for the production of lepidocrosite, which comprises the step of adding an alkali to an aqueous solution of ferrous chloride in an amount 0.20 to 0.95 times the theoretical amount necessary for converting the ferrous chloride to ferrous hydroxide, the step of blowing an oxygen-containing gas into the obtained Fe²⁺-containing solution to form a seed crystal of γ-FeOOH, the step of aging and growing γ-FeOOH while maintaining the Fe²⁺-containing solution at a pH value of 2.0 to 8.0 in a non-oxidizing atmosphere, and the step of separating grown particles of γ-FeOOH from the Fe²⁺-containing solution without addition of an oxygen-containing gas and an alkali, and washing the separated particles. According to this process, lepidocrosite having a sharp particle size distribution (uniform particle size) without agglomeration can be obtained.
摘要翻译: 公开了一种生产线虫病的方法,其包括向氯化亚铁的水溶液中添加碱金属的步骤,其量为将氯化亚铁转化为氢氧化亚铁所需的理论量的0.20至0.95倍,吹入 将含氧气体加入到所得含Fe 2+溶液中以形成γ-FeOOH晶种,同时保持含有含Fe 2+的溶液在老化和生长γ-FeOOH的步骤 在非氧化性气氛中的pH值为2.0〜8.0,以及从不含有含氧气体和碱的含Fe 2+溶液中分离生长的γ-FeOOH颗粒的步骤,以及 洗涤分离的颗粒。 根据该方法,可以获得没有附聚的具有尖锐的粒度分布(均匀的粒径)的纤维球。
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