High resolution transmission electron microscopy and analytical study of ilmenite weathering and oxidation

钛铁矿风化和氧化的高分辨率透射电子显微镜及分析研究

• 批准号: 26724309
• 负责人: Professor Dr. Andrew Putnis
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26724309?language=en
• 关键词: resolution; transmission; electron; microscopy; analytical

Ilmenite (FeTiO3) is known to undergo weathering through oxidation and removal of Fe to form a continuous series of compositions from ilmenite to pseudorutile (Fe2Ti3O9), and with further weathering, to leucoxene. Details of the weathering of ilmenite on the atomic scale are not yet fully understood. Understanding alteration mechanisms is important in all chemical weathering processes, and for ilmenite, the chemical changes during weathering determine the processing methods used for the commercial conversion of ilmenite to TiO2. In the proposed project, the progressive changes in the structure and composition of ilmenite during weathering will be studied for the first time by high resolution and energy-filtered transmission electron microscopy as well as a range of ancillary analytical methods. Studies will be made on natural weathered ilmenite sand from Australia and India, on weathered profiles of an igneous ilmenite ore deposit in Finland, as well as on experimentally altered ilmenite.

钛铁矿(FeTiO3)通过氧化和脱铁形成从钛铁矿到假钛铁矿(Fe2Ti3O9)的一系列连续成分，并随着进一步的风化而形成白蜡石，已知的风化过程。钛铁矿在原子尺度上风化的细节尚不完全清楚。了解蚀变机制在所有化学风化过程中都很重要，对于钛铁矿来说，风化过程中的化学变化决定了将钛铁矿转化为二氧化钛的商业加工方法。在拟议的项目中，将首次使用高分辨率和能量过滤的透射电子显微镜以及一系列辅助分析方法来研究钛铁矿在风化过程中结构和组成的逐步变化。将对澳大利亚和印度的自然风化钛铁矿砂、芬兰一个火成岩钛铁矿矿床的风化剖面以及实验蚀变钛铁矿进行研究。