FORMATION OF MAGNETITE FINE PARTICLES BY CHEMICAL ABSORPTION INTO AQUEOUS SUSPENSIONS OF FERROUS HYDROXIDE
FORMATION OF MAGNETITE FINE PARTICLES BY CHEMICAL ABSORPTION INTO AQUEOUS SUSPENSIONS OF FERROUS HYDROXIDE
复制标题
通过化学吸收到氢氧化亚铁水悬浮液中形成磁铁矿细颗粒
DOI：
10.1080/00986448908940670
复制
发表时间：
1989
影响因子：
2.5
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
E. Sada;H. Kumazawa;H.
Fe（OH）_2水悬浮液与溶解氧氧化形成磁铁矿颗粒的过程包括：（Ⅰ）气泡周围液膜中的FeOH ~+离子氧化形成铁羟基络合物，和（ii）通过FeOH+和铁羟基络合物在与Fe（OH）相邻的薄层中的共沉淀形成磁铁矿的步骤，2悬浮介质本体中的颗粒。氧化反应速率对总Fe（Ⅱ）的含量可用零级反应表示，对总Fe（Ⅱ）的含量可用一级反应表示。氧化反应在50 min内完成，只生成0.14 ~ 0.20 μ m的八面体颗粒，当反应完成时间超过0.5 min时，生成的八面体颗粒的粒径为0.14 μm ~ 0.20 μ m 90分钟，几乎所有颗粒都是立方体形状，平均尺寸约为0.20 μ m。
Abstract The formation of magnetite particles by oxidation of aqueous suspensions of Fe(OH)2 with dissolved oxygen has been found to be composed of (I) the formation step of ferric hydroxo-complex by oxidation of FeOH' ion in the liquid film around the gas bubble, and (ii) the formation step of magnetite by the coprecipitation of FeOH+ and ferric hydroxo-complex in the thin layer adjacent to the Fe(OH)2 particle in the bulk of suspension medium. The oxidation reaction rate can be expressed apparently by zero-order with respect to the content of total Fe(II) and by first-order with respect to the concentration of dissolved oxygen up to the fractional oxidation of 0.9.Only octahedral particles whose size ranges from O.14μm to 0.20 μmare formed so long as the oxidation reaction finishes within 50 min. When the reaction completion time becomes longer than about 90 min, almost particles are of cubic shape with a mean size of about 0.20 fim.