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首页> 外文期刊>ISIJ international >Inhibition of conversion process from Fe(OH)_3 to beta-FeOOH and alpha-Fe_2O_3 by the addition of silicate ions
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Inhibition of conversion process from Fe(OH)_3 to beta-FeOOH and alpha-Fe_2O_3 by the addition of silicate ions

机译：通过添加硅酸盐离子抑制从Fe（OH）_3到β-FeOOH和α-Fe_2O_3的转化过程

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摘要

To examine the influence of silicate ions on a conversion process of condensed ferric hydroxide (Fe(OH)_3) gel to ferric oxyhydroxides and iron oxides, the Fe(OH)_3 gel was aged at 60 deg C in the presence and absence of silicate ions. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used for characterizing the resulting solid particles. XRD profiles and TEM micrographs showed that the Fe(OH)_3 gel transferred into beta-FeOOH and alpha-Fe_2O_3 particles by aging in the absence of silicate ions. On the other hand, silicate ions suppressed the conversion of the Fe(OH)_3 gel to beta-FeOOH and alpha-Fe_2O_3 particles. The conversion of the Fe(OH)_3 gel to alpha-Fe_2O_3 particles is almost independent of pH of solution under the conditions in the present study, indicating that silicate ions essentially suppress the formation of beta-FeOOH and alpha-Fe_2O_3 particles.
机译：为了检查硅酸根离子对缩合的氢氧化铁（Fe（OH）_3）凝胶转化为羟基氧化铁和氧化铁的转化过程的影响，在存在和不存在硅酸盐的情况下，将Fe（OH）_3凝胶在60℃下老化离子。从老化的含有胶体颗粒的悬浮液中取样细颗粒和上清液。粉末X射线衍射（XRD）和透射电子显微镜（TEM）已用于表征所得固体颗粒。 XRD图谱和TEM显微照片表明，Fe（OH）_3凝胶通过在不存在硅酸盐离子的条件下老化而转移到β-FeOOH和α-Fe_2O_3颗粒中。另一方面，硅酸盐离子抑制了Fe（OH）_3凝胶向β-FeOOH和α-Fe_2O_3颗粒的转化。在本研究条件下，Fe（OH）_3凝胶向α-Fe_2O_3颗粒的转化几乎与溶液的pH无关，这表明硅酸盐离子基本上抑制了β-FeOOH和α-Fe_2O_3颗粒的形成。

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