Synchrotron X-ray absorption spectroscopic study of thorium in ilmenite and titanium slag: towards green mineral processing

钛铁矿和钛渣中钍的同步辐射X射线吸收光谱研究：迈向绿色选矿

• 批准号: 543337-2019
• 负责人: Pan, Yuanming
• 金额: $ 2.4万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=699588
• 关键词: Synchrotron; ray; absorption; spectroscopic; study

Thorium as a common radionuclide in some ore minerals, mine wastes and mine tailings poses a serious risk to the environment on the one hand but represents a potential source of this strategic material for the thorium fuel cycle that is becoming increasingly viable in recent years. Therefore, extraction of thorium as a byproduct from ores or waste materials not only has environmental benefits but also is of economic value. Three types of materials that contain elevated thorium contents are: (1) anhydrite- and gypsum-rich tailings stemming from the extraction of rare earth elements from monazite and bastnaesite ores; (2) ferroniobium slag from smelting of pyrochlore concentrates to produce ferroniobium alloy and (3) titanium slag (used for TiO2 pigment) from smelting of ilmenite concentrates extracted from heavy mineral sands. Extraction of thorium as a byproduct and recovery of thorium from mine wastes for the thorium fuel cycle both require detailed knowledge about the distribution, speciation and uptake mechanisms of thorium in host materials. The present study, in collaboration with Rio Tinto Fer et Titane of Sorel-Tracy, Quebec, is designed to use several state-of-the-art analytical techniques (e.g., microbeam synchrotron X-ray fluorescence mapping, synchrotron X-ray absorption spectroscopy, and electron paramagnetic resonance spectroscopy) to investigate the distribution, speciation and uptake mechanisms of thorium in selected titanium slags and ilmenite concentrates, with applications to both minimizing radiation risks to the environment and potential development of new techniques to extract this material for the thorium fuel cycle. The specific objectives of the proposed project include: 1) systematic study on the distribution of thorium in titanium slags and ilmenite concentrates, 2) detailed structural study on the speciation and uptake mechanisms of thorium in titanium slags and ilmenite concentrates, and 3) preliminary experiments to extract thorium from titanium slags and ilmenite concentrates. This project of combined basic and applied research provides an excellent training opportunity for one PhD student (Kamil Chadirji-Martinez) and one undergraduate research assistant at the University of Saskatchewan.

在某些矿石矿物质中，雷雷作为一种常见的放射性核素，一方面是对环境的严重风险，但代表了thor燃料循环的潜在战略材料的潜在来源，近年来，这种战略材料越来越活跃。因此，从矿石或废物材料中提取作为副产品的副产品不仅具有环境利益，而且具有经济价值。含有升高or含量的三种类型的材料是：（1）源自稀有土和石膏富含石膏的尾矿，源于从独居石和薄荷矿石上提取稀有地球元素； （2）从焦油浓缩物冶炼中产生铁硅酸盐合金和（3）钛矿石（用于Tio2颜料）的氟烷炉炉，该矿石是从重矿物砂中提取的伊尔梅特浓缩物的钛矿石（用于Tio2颜料）。 thor作为副产品的提取和从矿井燃料循环中的矿石废物中恢复的均需要有关托管在宿主材料中的分布，物种形成和吸收机制的详细知识。本研究与Sorel-Trace的Rio Tinto fer et titane合作，旨在使用几种最先进的分析技术（例如Microbeam Synchrotron X射线荧光映射，同步X射线X射线X射线X射线X射线X射线吸收光谱谱和电磁磁场的指定机制，并研究了分配机制，并研究了分配的分配，研究了分配，研究钛矿渣和伊米特浓缩物，可用于最大程度地减少对环境的辐射风险，也可以将新技术的潜在开发降低，以便为thor燃料循环提取这种材料。拟议项目的具体目的包括：1）关于钛渣和伊利米特浓缩液中米的分布的系统研究，2）详细的结构性研究详细的结构性研究，研究钛矿渣和伊利米特浓度的thor thos的形成和摄取机制，以及3）从钛植物中提取thorium thorium thorium thorium shitanium slags and Ilmenite andimenite limenite andimenemenite limenemenite andimeneMeneMeneMenEnient。这项基础和应用研究合并的项目为一位博士生（Kamil Chadirji-Martinez）和萨斯喀彻温大学的一名本科研究助理提供了绝佳的培训机会。