公开(公告)号：DE2735316A1

公开(公告)日：1979-02-08

申请号：DE2735316

申请日：1977-08-05

Applicant: BASF AG

Inventor： BRODT RUDOLF DIPL CHEM DR ,  JAKUSCH HELMUT DIPL PHYS DR ,  KOESTER EBERHARD DIPL PHYS DR ,  LOESER WERNER DIPL ING DR ,  OHLINGER MANFRED DIPL CHEM DR ,  SARNECKI WILHELM DIPL-CHEM DR ,  STECK WERNER DIPL CHEM DR

IPC: C01G49/08 ,  C01G49/06 ,  G11B5/62 ,  G11B5/70 ,  G11B5/706 ,  H01F1/11

Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by dehydrating acicular iron(III) oxide hydroxides to give acicular iron(III) oxides, then reducing these iron(III) oxides at from 300 DEG to 650 DEG C. by means of an organic compound which decomposes in this temperature range, and oxidizing the reduced product with an oxygen-containing gas at from 200 DEG to 500 DEG C., wherein the acicular iron(III) oxide hydroxides employed consist of a mixture of goethite and lepidocrocite, containing at least 60% of the latter, and the dehydration is carried out at from 250 DEG to 700 DEG C.

公开(公告)号：DE2733105B1

公开(公告)日：1979-01-18

申请号：DE2733105

申请日：1977-07-22

Applicant: BASF AG

Inventor： ZIRKER GUENTER DIPL-CHEM DR ,  GETTERT HANS DIPL-CHEM DR ,  SARNECKI WILHELM DIPL-CHEM DR ,  J DIPL-CHEM DR HENRICI HANS ,  HEINER DIPL-CHEM DR REICH HANS

IPC: C10J3/46 ,  C01B3/36 ,  C01B3/50 ,  C01B3/58 ,  C10G9/00 ,  C10K3/02 ,  C01B2/14 ,  C10G9/48