公开(公告)号：US4448761A

公开(公告)日：1984-05-15

申请号：US435369

申请日：1982-10-20

申请人： Wilhelm Sarnecki ,  Jenoe Kovacs ,  Werner Loeser ,  Peter Rudolf ,  Guenter Vaeth

发明人： Wilhelm Sarnecki ,  Jenoe Kovacs ,  Werner Loeser ,  Peter Rudolf ,  Guenter Vaeth

IPC分类号： C01G49/02 ,  C01G49/06 ,  C01G49/08 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70694 ,  C01G49/06 ,  C01G49/08 ,  C01P2004/10 ,  C01P2006/42

摘要： Acicular ferrimagnetic iron oxides are prepared by a process in which iron (III) oxide hydroxide consisting essentially of lepidocrocite is reduced at from 350.degree. to 600.degree. C. by means of an organic compound which is a synthetic polymer with a molecular weight of from 3,000 to 40,000 to give magnetite, which, if desired, is subsequently partially or completely oxidized with an oxygen-containing gas at from 200.degree. to 450.degree. C.

摘要翻译： 针状亚铁磁性氧化铁通过以下方法制备：其中主要由氯铁矿石组成的氧化铁（III）氢氧化物在350至600℃下还原，其中有机化合物是分子量为3,000的合成聚合物 至40,000，以得到磁铁矿，如果需要，其随后在200-450℃下用含氧气体部分或完全氧化。

公开(公告)号：US4497723A

公开(公告)日：1985-02-05

申请号：US508168

申请日：1983-06-27

申请人： Manfred Ohlinger ,  Guenter Vaeth ,  Peter Rudolf ,  Wilhelm Sarnecki ,  Helmut Jakusch ,  Eberhard Koester ,  Milena Melzer

发明人： Manfred Ohlinger ,  Guenter Vaeth ,  Peter Rudolf ,  Wilhelm Sarnecki ,  Helmut Jakusch ,  Eberhard Koester ,  Milena Melzer

IPC分类号： C01G49/02 ,  C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  C01G49/08

CPC分类号： B82Y30/00 ,  C01G49/06 ,  G11B5/70694 ,  C01P2002/60 ,  C01P2004/10 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/42

摘要： A process for the preparation of acicular ferrimagnetic iron oxides by reducing gamma-iron(III) oxide hydroxide to magnetite, at from 280.degree. to 620.degree. C., by means of an organic compound which is decomposable at this temperature in the presence of iron oxide, and, optionally, a stream of reducing gas, and, if desired, then oxidizing the magnetite with oxygen-containing gases, at from 150.degree. to 450.degree. C., to acicular ferrimagnetic iron oxide of the formula FeO.sub.x, where x is from above 1.33 to 1.50, wherein the organic compound used for the reduction is a non-polar glycerol ester of a fatty acid which is introduced into the aqueous reaction suspension during the preparation of the gamma-iron(III) oxide hydroxide.

摘要翻译： 一种制备针状亚铁磁性氧化铁的方法，该方法是通过在这种温度下在铁存在下可分解的有机化合物将280℃至620℃的氧化氢氧化物还原成磁铁矿 氧化物和任选的还原气体流，并且如果需要，然后用含氧气体在150℃至450℃下将磁铁矿氧化成式FeO x的针状亚铁磁性氧化铁，其中x为 从1.33到1.50，其中用于还原的有机化合物是在制备γ-铁（III）氧化物氢氧化物期间引入到水性反应悬浮液中的非极性甘油酯脂肪酸酯。