发明名称 |
Method for manufacturing lepidocrocite |
摘要 |
Lepidocrocite ( gamma -FeOOH) with an large specific surface area and a uniform particle size is provided by a method comprising preparing a suspension of ferrous hydroxide at a pH of 6.5 to 7.5 by adding a ferrous salt solution with an alkali solution in an amount of 0.4 to 0.7 times the theoretical amount for converting all the ferrous salt to ferrous hydroxide, blowing an oxygen-containing gas into the suspension to form a seed crystal of gamma -FeOOH, completing the generation reaction of gamma -FeOOH by blowing an oxygen-containing gas into the suspension while adding an alkali solution to keep the pH of the suspension within a range of 3 to 5, in which an Si concentration of the suspensions for seed reaction and for generation reaction of gamma -FeOOH is controlled to be within 5 to 30 ppm.
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申请公布号 |
US4729846(A) |
申请公布日期 |
1988.03.08 |
申请号 |
US19870004943 |
申请日期 |
1987.01.20 |
申请人 |
SHOWA DENKO KABUSHIKI KAISHA |
发明人 |
MATSUI, YASUSHI;KOIKE, NORIO;TAKAHASHI, KUNIO;MATSUE, HIROSHI |
分类号 |
H01F1/11;C01G49/02;C01G49/06;(IPC1-7):C01G49/02 |
主分类号 |
H01F1/11 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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