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Fe(Ⅲ)盐水溶液受热后发生水解: Fe~(3+)+2H_2O=FeOOH↓+3H~+ (1)FeOOH有进一步转变成氧化物的趋势: 2FeOOH=Fe_2O_3↓+H_2O (2)虽然通常所得沉淀粒子的形状及大小都是不规则的,但是在严格控制的条件下,有可能制备由形状相同、尺寸分布很窄的粒子组成的均分散体系。已经预见到各种均分散粒子将会在许多新技术领域中获得重要的应用,但严格的制备条件目前限制着均分散粒子的大量制备。张玉亭等曾在无防尘设备的条件下制出了球形α-Fe_2O_3均分散粒子。本文报导在普通的
Fe (Ⅲ) + 2H_2O = FeOOH ↓ + 3H ~ + (1) FeOOH has the tendency to further transform into oxide: 2FeOOH = Fe_2O_3 ↓ + H_2O (2) The shape and size of the resulting precipitated particles are irregular, but under strictly controlled conditions it is possible to prepare homogeneous dispersions consisting of particles of the same shape and of narrow size distribution. It has been envisioned that a variety of homogeneously dispersed particles will find important applications in many new technical fields, but stringent preparation conditions now limit the mass production of homogenized particles. Zhang Yu-ting and other dust-free equipment in the past under the conditions of the spherical α-Fe_2O_3 were dispersed particles. This article reports on the general