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Oxidation and reduction of ilmenite and the reduction of pseudobrookite.

机译：钛铁矿的氧化和还原以及假板钛矿的还原。

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摘要

In situ gravimetric measurements and microscopic examinations were used to determine the mechanisms of oxygen removal from synthetic ilmenite discs between 823 and 1353 K. Under a hydrogen atmosphere, iron was observed to form a layer of low porosity on the surface of samples early in the reduction. This created diffusion limitations for hydrogen and water to and from the reaction front. A shrinking core reduction model, modified to include the growth of this iron film, was capable of predicting the conversion-time relationships of ilmenite samples. An activation energy of 43 ;The oxidation of synthetic ilmenite was examined with thermogravimetric techniques, x-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. The phases found and their relative distribution in partially oxidized samples were related to the FeO-Fe;Synthetic pseudobrookite was reduced with hydrogen at 873 K and 973 K in a thermogravimetric reactor system. Electron microscopy, energy dispersive spectroscopy, and x-ray diffraction were used to identify and quantify the series of intermediate phases produced. These intermediate phases were found to be the same at both temperatures and included an ilmenite-hematite solution, ulvospinel, ilmenite, and iron and rutile. Several phase regions suggested by proposed Fe-Fe
机译：使用原位重力测量和显微镜检查来确定从823至1353 K之间的合成钛铁矿圆片中除氧的机理。在氢气气氛下，在还原初期，观察到铁在样品表面形成了低孔隙率层。这就限制了氢气和水进出反应前沿的扩散限制。修改后的铁心收缩模型可以包括铁膜的生长，它能够预测钛铁矿样品的转换时间关系。活化能为43；用热重技术，X射线衍射，扫描电子显微镜和能量色散光谱法检查了合成钛铁矿的氧化。在部分氧化的样品中发现的相及其相对分布与FeO-Fe有关；在热重反应器系统中，氢气在873 K和973 K下将合成的假板钛矿还原。电子显微镜，能量分散光谱和X射线衍射用于鉴定和量化产生的一系列中间相。发现这些中间相在两个温度下都是相同的，包括钛铁矿-赤铁矿溶液，ulsoppinel，钛铁矿以及铁和金红石。拟议的铁-铁建议的几个相区

著录项

  • 作者

    Briggs, Randall Alan.;

  • 作者单位

    Worcester Polytechnic Institute.;

  • 授予单位 Worcester Polytechnic Institute.;
  • 学科 Geology.;Engineering Metallurgy.;Engineering Chemical.
  • 学位 Ph.D.
  • 年度 1991
  • 页码 242 p.
  • 总页数 242
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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