Compositions – Magnetic – Iron-oxygen compound containing
Patent
1987-01-20
1988-03-08
Garvin, Sr., Patrick P.
Compositions
Magnetic
Iron-oxygen compound containing
423632, 423634, C01G 4902
Patent
active
047298464
ABSTRACT:
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.
REFERENCES:
patent: 2560971 (1951-07-01), Martin
patent: 3082067 (1963-03-01), Hund
patent: 3904540 (1975-09-01), Bennetch et al.
patent: 4086174 (1978-04-01), Bennetch
patent: 4108787 (1978-08-01), Masaki et al.
patent: 4136158 (1979-06-01), Okuda et al.
patent: 4176172 (1979-11-01), Bennetch et al.
patent: 4221776 (1980-09-01), Autzen et al.
patent: 4323464 (1982-04-01), Umeki
patent: 4396596 (1983-08-01), Ogisu et al.
patent: 4464352 (1984-08-01), Autzen et al.
patent: 4497723 (1985-02-01), Ohlinger et al.
Koike Norio
Matsue Hiroshi
Matsui Yasushi
Takahashi Kunio
Garvin, Sr. Patrick P.
Harvey Paige C.
Showa Denko Kabushiki Kaisha
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