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    • 7. 发明授权
    • Production of magnetic iron oxides
    • 生产磁性氧化铁
    • US4358431A
    • 1982-11-09
    • US286134
    • 1981-07-23
    • Horst BrunnPeter KiemleFranz HundHeribert Bade
    • Horst BrunnPeter KiemleFranz HundHeribert Bade
    • C01G49/02C01G49/06G11B5/706H01F1/10H01F1/11C01G49/08
    • G11B5/70642C01G49/06C01P2004/03C01P2004/10C01P2004/61C01P2006/42
    • In the production of needle-shaped magnetic iron oxide pigments by treating iron with a nitro-aromatic in the presence of .alpha.-FeOOH nuclei to form .alpha.-FeOOH particles and an amino-aromatic, and thereafter dehydrating the .alpha.-FeOOH particles and reducing them, the improvement which comprises forming the .alpha.-FeOOH nuclei at about 0.degree. to 90.degree. C. in a suspension of metallic iron, an iron-(II)-salt and a nitro-aromatic by adding a basic precipitant in about 10 to 95% of the amount required for the complete precipitation of the iron in the iron-(II)-salt. Advantageously the metallic iron comprises cast iron, the nitro-aromatic comprises nitrobenzene, the amino-aromatic comprises aniline, the basic precipitant comprises at least one of ammonia and a basically reacting alkali metal, alkaline earth metal or ammonium salt, the nuclei formation is carried out at about 10.degree. to 60.degree. C., and the basic precipitant is added in about 20 to 80% of the amount required for the complete precipitation of the iron in the iron-(II)-salt, additional iron and nitrobenzene being added to the suspension of precipitated nuclei to form the .alpha.-FeOOH particles.
    • 在通过在α-FeO​​OH核的存在下用硝基芳族化合物处理铁以形成α-FeO​​OH颗粒和氨基芳族化合物来生产针状磁性氧化铁颜料,然后使α-FeO​​OH颗粒脱水并还原 包括在金属铁,铁 - (II) - 盐和硝基 - 芳族化合物的悬浮液中在约0至90℃下形成α-FeO​​OH核的改进,通过在约10至95 在铁 - (II) - 铁中完全沉淀铁所需的量的%。 有利地,金属铁包括铸铁,硝基芳族包括硝基苯,氨基 - 芳族包括苯胺,碱性沉淀剂包括氨和基本上反应的碱金属,碱土金属或铵盐中的至少一种,承载核形成 在约10℃至60℃下加入碱性沉淀剂,其中添加铁(II) - 铁中完全沉淀所需的量的约20至80%,添加额外的铁和硝基苯 到析出的核的悬浮液以形成α-FeO​​OH颗粒。