公开(公告)号：DE3160523D1

公开(公告)日：1983-08-04

申请号：DE3160523

申请日：1981-05-08

Applicant: BASF AG

Inventor： SIEGLE HANSJOERG DR ,  REICH HANS HEINER DR ,  AUTZEN HORST DR ,  STECK WERNER DR ,  LOESER WERNER DR ,  HETZEL ECKHARD ,  OHLINGER MANFRED DR

IPC: B01J8/38 ,  B22F9/22 ,  F27B15/02 ,  H01F1/06

Abstract: A process for the preparation of acicular ferromagnetic metal particles, consisting essentially of iron, by reducing acicular iron oxides and/or iron oxide hydroxides, which are either pure or are modified with conventional foreign metal ions, by means of a gaseous reducing agent in a fluidized bed furnace in which a stirrer is provided immediately above the fluidizing grid.

公开(公告)号：DE3063008D1

公开(公告)日：1983-06-16

申请号：DE3063008

申请日：1980-02-07

Applicant: BASF AG

Inventor： RUDOLF PETER DR ,  STECK WERNER DR ,  JAKUSCH HELMUT DR ,  VAETH GUENTER ,  JAECKH CHRISTOF DR

IPC: C01G49/06 ,  G11B5/68 ,  G11B5/706 ,  H01F1/11

Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 percent by weight of cobalt(II) ions and from 0.1 to 15 percent by weight of iron(II) ions, wherein a solution containing cobalt(II) hydroxide and iron(II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100 DEG -220 DEG C.

公开(公告)号：DE3061463D1

公开(公告)日：1983-02-03

申请号：DE3061463

申请日：1980-02-04

Applicant: BASF AG

Inventor： STECK WERNER DR ,  RUDOLF PETER DR ,  HUEBNER WERNER ,  AUTZEN HORST DR ,  JAKUSCH HELMUT DR ,  SCHAEFER DIETER DR ,  VAETH GUENTER

IPC: B22F9/22 ,  C01G49/02 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/06