发明公开
EP0269361A2 Process for producing acicular iron alpha-oxyhydroxide particles
失效
Verfahren zur Herstellung vonnadelförmigenTeilchen aus alpha-Eisenoxidhydroxid。
- 专利标题： Process for producing acicular iron alpha-oxyhydroxide particles
- 专利标题（中）： Verfahren zur Herstellung vonnadelförmigenTeilchen aus alpha-Eisenoxidhydroxid。
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申请号： EP87310171.1申请日： 1987-11-18
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公开(公告)号： EP0269361A2公开(公告)日： 1988-06-01
- 发明人: Saito, Masayoshi , I, Jiro
- 申请人： Chisso Corporation
- 申请人地址： 6-32, Nakanoshima 3-chome Kita-ku Osaka-shi Osaka-fu JP
- 专利权人： Chisso Corporation
- 当前专利权人： Chisso Corporation
- 当前专利权人地址： 6-32, Nakanoshima 3-chome Kita-ku Osaka-shi Osaka-fu JP
- 代理机构： Pendlebury, Anthony
- 优先权： JP279201/86 19861122
- 主分类号： C01G49/06
- IPC分类号： C01G49/06 ; C01G49/02
摘要：
A process for producing acicular α-FeOOH particles having a narrow particle size distribution and recitified shape and being highly dispersed, which process comprises mixing with stirring an aqueous solution of a Fe(II) salt with an aqueous solution of an alkali in an equivalent ratio of alkali to Fe(II) salt of 1.5 or more, oxidizing the mixture with a O₂-containing gas, heat treating the resulting suspension of iron α-FeOOH particles to 60° to 100°C, further adding an aqueous solution of a Fe(II) salt in a proportion of Fe(II) to α-FeOOH of 0.5 to 10% and again oxidizing the mixture with a O₂-containing gas at 35° to 55°C.
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