Bayan Obo ore deposit is endowed with and lie hidden in the Proterozoic strata. The localities and occurrences of the minerals in the ore deposit were described. It is obviously that some minerals are strata minerals ...Bayan Obo ore deposit is endowed with and lie hidden in the Proterozoic strata. The localities and occurrences of the minerals in the ore deposit were described. It is obviously that some minerals are strata minerals and some are post strata minerals. The rare earths, niobium and tantalum minerals are exactly the post strata minerals. In these minerals the hydrothermal metasomatic phenomena distinctly reveal their metallogenic characteristics. According to tectonic movement, magma activity, mineral paragenesis, hydrothermal metasomatism, geological age and lasting time scale of metallogenesis, and some other factors, it is supposed that genesis of rare earths, niobium and tantalum minerals in Bayan Obo ore deposit are closely related with hydrothermal metallogenic solution which is differentiated from silica acid and carbonic acid magma and derived from deep seated source, and then intruded into Proterozoic strata and metasomatized. It is recognized that the metallogenesis of Bayan Obo ore deposit is undergoing a long geological period and many episodes.展开更多
The strategy of carbon neutrality is reshaping the global landscape of resource flow and recycling.As the final sink of geological minerals,the proliferated anthropogenic minerals,also called secondary resources,play ...The strategy of carbon neutrality is reshaping the global landscape of resource flow and recycling.As the final sink of geological minerals,the proliferated anthropogenic minerals,also called secondary resources,play an increasingly important role in resource supply enrichment.Niobium is a critical metal that lacks full concern for its sustainability.The fundamental principle of niobium circularity is to recycle and maintain the material as close to the manufacturing process as possible.Here we estimate the niobium-containing applications lost at their end-of-life,underscoring the imperative to minimize such disposal.Additionally,we elucidate the extraction processes for scrap and alloy quantities throughout the industry's lifecycle.Drawing from anticipated waste generated by the majority of niobium applications,a forecast indicates a potential loss of approximately 168 kt by 2090 in the absence of recycling.Contrastingly,with a recycling efficiency of 90%for niobium,the projected loss diminishes to approximately 16 kt.We delve into the significance of niobium's circular economy and explore various aspects that demand further investigation for a seamless transition from linear to circular practices.展开更多
本法取20mg 铌钽、稀土单矿物样品,采用熔融、压薄样法,克服矿物效应和减少用样量,以 Mo Kα、Mo KαⅡ线作内标,控制制样与测量精度,采用透空照射法,降低散射背景与痕量元素的检测限,直接提供26个元素的分析数据,方法简便、快速、具有...本法取20mg 铌钽、稀土单矿物样品,采用熔融、压薄样法,克服矿物效应和减少用样量,以 Mo Kα、Mo KαⅡ线作内标,控制制样与测量精度,采用透空照射法,降低散射背景与痕量元素的检测限,直接提供26个元素的分析数据,方法简便、快速、具有良好的精密度和准确度。展开更多
文摘Bayan Obo ore deposit is endowed with and lie hidden in the Proterozoic strata. The localities and occurrences of the minerals in the ore deposit were described. It is obviously that some minerals are strata minerals and some are post strata minerals. The rare earths, niobium and tantalum minerals are exactly the post strata minerals. In these minerals the hydrothermal metasomatic phenomena distinctly reveal their metallogenic characteristics. According to tectonic movement, magma activity, mineral paragenesis, hydrothermal metasomatism, geological age and lasting time scale of metallogenesis, and some other factors, it is supposed that genesis of rare earths, niobium and tantalum minerals in Bayan Obo ore deposit are closely related with hydrothermal metallogenic solution which is differentiated from silica acid and carbonic acid magma and derived from deep seated source, and then intruded into Proterozoic strata and metasomatized. It is recognized that the metallogenesis of Bayan Obo ore deposit is undergoing a long geological period and many episodes.
基金supported by the National Natural Science Foundation of China(Grant Nos.92062111&72394402)。
文摘The strategy of carbon neutrality is reshaping the global landscape of resource flow and recycling.As the final sink of geological minerals,the proliferated anthropogenic minerals,also called secondary resources,play an increasingly important role in resource supply enrichment.Niobium is a critical metal that lacks full concern for its sustainability.The fundamental principle of niobium circularity is to recycle and maintain the material as close to the manufacturing process as possible.Here we estimate the niobium-containing applications lost at their end-of-life,underscoring the imperative to minimize such disposal.Additionally,we elucidate the extraction processes for scrap and alloy quantities throughout the industry's lifecycle.Drawing from anticipated waste generated by the majority of niobium applications,a forecast indicates a potential loss of approximately 168 kt by 2090 in the absence of recycling.Contrastingly,with a recycling efficiency of 90%for niobium,the projected loss diminishes to approximately 16 kt.We delve into the significance of niobium's circular economy and explore various aspects that demand further investigation for a seamless transition from linear to circular practices.
